./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1538690546

<...>
Warning: Permanently added '10.128.1.161' (ED25519) to the list of known hosts.
execve("./syz-executor1538690546", ["./syz-executor1538690546"], 0x7fff14c225b0 /* 10 vars */) = 0
brk(NULL)                               = 0x55557fb8c000
brk(0x55557fb8cd00)                     = 0x55557fb8cd00
arch_prctl(ARCH_SET_FS, 0x55557fb8c380) = 0
set_tid_address(0x55557fb8c650)         = 5840
set_robust_list(0x55557fb8c660, 24)     = 0
rseq(0x55557fb8cca0, 0x20, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor1538690546", 4096) = 28
getrandom("\xff\x50\xa9\x1b\xcd\xef\x36\x9a", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x55557fb8cd00
brk(0x55557fbadd00)                     = 0x55557fbadd00
brk(0x55557fbae000)                     = 0x55557fbae000
mprotect(0x7fdbe5171000, 16384, PROT_READ) = 0
mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000
mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000
mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = 3
ioctl(3, LOOP_CLR_FD)                   = -1 ENXIO (No such device or address)
close(3)                                = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5841 attached
 <unfinished ...>
[pid  5841] set_robust_list(0x55557fb8c660, 24 <unfinished ...>
[pid  5840] <... clone resumed>, child_tidptr=0x55557fb8c650) = 5841
[pid  5841] <... set_robust_list resumed>) = 0
[pid  5841] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5841] setpgid(0, 0)               = 0
[pid  5841] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5841] write(3, "1000", 4)         = 4
[pid  5841] close(3)                    = 0
executing program
[pid  5841] write(1, "executing program\n", 18) = 18
[pid  5841] memfd_create("syzkaller", 0) = 3
[pid  5841] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5841] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5841] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5841] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid  5841] ioctl(4, LOOP_SET_FD, 3)    = 0
[pid  5841] close(3)                    = 0
[pid  5841] close(4)                    = 0
[pid  5841] mkdir("./file1", 0777)      = 0
[   71.894724][ T5841] loop0: detected capacity change from 0 to 32768
[   71.920530][ T5841] =======================================================
[   71.920530][ T5841] WARNING: The mand mount option has been deprecated and
[   71.920530][ T5841]          and is ignored by this kernel. Remove the mand
[pid  5841] mount("/dev/loop0", "./file1", "ocfs2", MS_MANDLOCK|MS_DIRSYNC|MS_NODIRATIME, "acl,heartbeat=none,errors=remount-ro,coherency=full,coherency=full,localflocks,errors=remount-ro,acl"...) = 0
[pid  5841] openat(AT_FDCWD, "./file1", O_RDONLY|O_DIRECTORY) = 3
[pid  5841] chdir("./file1")            = 0
[   71.920530][ T5841]          option from the mount to silence this warning.
[   71.920530][ T5841] =======================================================
[   71.968716][ T5841] ocfs2: Slot 0 on device (7,0) was already allocated to this node!
[   71.984872][ T5841] ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
[pid  5841] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5841] mkdirat(AT_FDCWD, "./file0", 000) = 0
[pid  5841] mkdirat(AT_FDCWD, "./file1", 000) = 0
[pid  5841] mkdir("./bus", 000)         = 0
[   72.058980][ T5841] 
[   72.061313][ T5841] ======================================================
[   72.068308][ T5841] WARNING: possible circular locking dependency detected
[   72.075310][ T5841] 6.16.0-rc4-syzkaller-00319-g05df91921da6 #0 Not tainted
[   72.082392][ T5841] ------------------------------------------------------
[   72.089384][ T5841] syz-executor153/5841 is trying to acquire lock:
[   72.095785][ T5841] ffff888030be0618 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_setattr+0x969/0x1b40
[   72.104780][ T5841] 
[   72.104780][ T5841] but task is already holding lock:
[   72.112121][ T5841] ffff8880608d6a20 (&oi->ip_alloc_sem){+.+.}-{4:4}, at: ocfs2_setattr+0x95a/0x1b40
[   72.121412][ T5841] 
[   72.121412][ T5841] which lock already depends on the new lock.
[   72.121412][ T5841] 
[   72.131792][ T5841] 
[   72.131792][ T5841] the existing dependency chain (in reverse order) is:
[   72.140789][ T5841] 
[   72.140789][ T5841] -> #4 (&oi->ip_alloc_sem){+.+.}-{4:4}:
[   72.148585][ T5841]        lock_acquire+0x120/0x360
[   72.153588][ T5841]        down_write+0x96/0x1f0
[   72.158339][ T5841]        ocfs2_try_remove_refcount_tree+0xb6/0x320
[   72.164819][ T5841]        ocfs2_xattr_set+0x595/0x11f0
[   72.170172][ T5841]        ocfs2_set_acl+0x701/0x7b0
[   72.175260][ T5841]        ocfs2_iop_set_acl+0x1aa/0x2a0
[   72.180696][ T5841]        vfs_remove_acl+0x48c/0x700
[   72.185875][ T5841]        ovl_workdir_create+0x4f3/0x7f0
[   72.191400][ T5841]        ovl_get_workdir+0x32c/0x1730
[   72.196752][ T5841]        ovl_fill_super+0x1386/0x35d0
[   72.202102][ T5841]        get_tree_nodev+0xbb/0x150
[   72.207192][ T5841]        vfs_get_tree+0x8f/0x2b0
[   72.212112][ T5841]        do_new_mount+0x24a/0xa40
[   72.217114][ T5841]        __se_sys_mount+0x317/0x410
[   72.222291][ T5841]        do_syscall_64+0xfa/0x3b0
[   72.227294][ T5841]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   72.233684][ T5841] 
[   72.233684][ T5841] -> #3 (&oi->ip_xattr_sem){++++}-{4:4}:
[   72.241480][ T5841]        lock_acquire+0x120/0x360
[   72.246483][ T5841]        down_read+0x46/0x2e0
[   72.251137][ T5841]        ocfs2_init_acl+0x2f9/0x720
[   72.256313][ T5841]        ocfs2_mknod+0x1321/0x2050
[   72.261402][ T5841]        ocfs2_mkdir+0x191/0x440
[   72.266316][ T5841]        vfs_mkdir+0x303/0x510
[   72.271062][ T5841]        do_mkdirat+0x247/0x590
[   72.275891][ T5841]        __x64_sys_mkdirat+0x87/0xa0
[   72.281159][ T5841]        do_syscall_64+0xfa/0x3b0
[   72.286160][ T5841]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   72.292552][ T5841] 
[   72.292552][ T5841] -> #2 (jbd2_handle){.+.+}-{0:0}:
[   72.299828][ T5841]        lock_acquire+0x120/0x360
[   72.304832][ T5841]        start_this_handle+0x1fa7/0x21c0
[   72.310443][ T5841]        jbd2__journal_start+0x2c1/0x5b0
[   72.316054][ T5841]        jbd2_journal_start+0x2a/0x40
[   72.321402][ T5841]        ocfs2_start_trans+0x376/0x6d0
[   72.326841][ T5841]        ocfs2_reserve_suballoc_bits+0x711/0x4640
[   72.333232][ T5841]        ocfs2_reserve_new_metadata_blocks+0x403/0x940
[   72.340066][ T5841]        ocfs2_mknod+0xe08/0x2050
[   72.345075][ T5841]        ocfs2_mkdir+0x191/0x440
[   72.349988][ T5841]        vfs_mkdir+0x303/0x510
[   72.354740][ T5841]        do_mkdirat+0x247/0x590
[   72.359569][ T5841]        __x64_sys_mkdirat+0x87/0xa0
[   72.364832][ T5841]        do_syscall_64+0xfa/0x3b0
[   72.369831][ T5841]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   72.376224][ T5841] 
[   72.376224][ T5841] -> #1 (&journal->j_trans_barrier){.+.+}-{4:4}:
[   72.384715][ T5841]        lock_acquire+0x120/0x360
[   72.389718][ T5841]        down_read+0x46/0x2e0
[   72.394376][ T5841]        ocfs2_start_trans+0x36a/0x6d0
[   72.399810][ T5841]        ocfs2_reserve_suballoc_bits+0x711/0x4640
[   72.406200][ T5841]        ocfs2_reserve_new_metadata_blocks+0x403/0x940
[   72.413027][ T5841]        ocfs2_mknod+0xe08/0x2050
[   72.418024][ T5841]        ocfs2_mkdir+0x191/0x440
[   72.422940][ T5841]        vfs_mkdir+0x303/0x510
[   72.427680][ T5841]        do_mkdirat+0x247/0x590
[   72.432507][ T5841]        __x64_sys_mkdirat+0x87/0xa0
[   72.437769][ T5841]        do_syscall_64+0xfa/0x3b0
[   72.442773][ T5841]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   72.449162][ T5841] 
[   72.449162][ T5841] -> #0 (sb_internal#2){.+.+}-{0:0}:
[   72.456614][ T5841]        validate_chain+0xb9b/0x2140
[   72.461879][ T5841]        __lock_acquire+0xab9/0xd20
[   72.467059][ T5841]        lock_acquire+0x120/0x360
[   72.472061][ T5841]        ocfs2_start_trans+0x26b/0x6d0
[   72.477505][ T5841]        ocfs2_setattr+0x969/0x1b40
[   72.482683][ T5841]        notify_change+0xb33/0xe40
[   72.487773][ T5841]        ovl_workdir_create+0x658/0x7f0
[   72.493303][ T5841]        ovl_get_workdir+0x32c/0x1730
[   72.498651][ T5841]        ovl_fill_super+0x1386/0x35d0
[   72.504001][ T5841]        get_tree_nodev+0xbb/0x150
[   72.509089][ T5841]        vfs_get_tree+0x8f/0x2b0
[   72.514008][ T5841]        do_new_mount+0x24a/0xa40
[   72.519094][ T5841]        __se_sys_mount+0x317/0x410
[   72.524268][ T5841]        do_syscall_64+0xfa/0x3b0
[   72.529265][ T5841]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   72.535654][ T5841] 
[   72.535654][ T5841] other info that might help us debug this:
[   72.535654][ T5841] 
[   72.545856][ T5841] Chain exists of:
[   72.545856][ T5841]   sb_internal#2 --> &oi->ip_xattr_sem --> &oi->ip_alloc_sem
[   72.545856][ T5841] 
[   72.559045][ T5841]  Possible unsafe locking scenario:
[   72.559045][ T5841] 
[   72.566472][ T5841]        CPU0                    CPU1
[   72.571814][ T5841]        ----                    ----
[   72.577159][ T5841]   lock(&oi->ip_alloc_sem);
[   72.581734][ T5841]                                lock(&oi->ip_xattr_sem);
[   72.588822][ T5841]                                lock(&oi->ip_alloc_sem);
[   72.595910][ T5841]   rlock(sb_internal#2);
[   72.600223][ T5841] 
[   72.600223][ T5841]  *** DEADLOCK ***
[   72.600223][ T5841] 
[   72.608350][ T5841] 5 locks held by syz-executor153/5841:
[   72.613874][ T5841]  #0: ffff88807bdfc0e0 (&type->s_umount_key#43/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970
[   72.623957][ T5841]  #1: ffff888030be0428 (sb_writers#8){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
[   72.633076][ T5841]  #2: ffff8880608d5f40 (&sb->s_type->i_mutex_key#14/1){+.+.}-{4:4}, at: ovl_workdir_create+0x133/0x7f0
[   72.644196][ T5841]  #3: ffff8880608d6d80 (&sb->s_type->i_mutex_key#16){+.+.}-{4:4}, at: ovl_workdir_create+0x5f7/0x7f0
[   72.655137][ T5841]  #4: ffff8880608d6a20 (&oi->ip_alloc_sem){+.+.}-{4:4}, at: ocfs2_setattr+0x95a/0x1b40
[   72.664863][ T5841] 
[   72.664863][ T5841] stack backtrace:
[   72.670755][ T5841] CPU: 0 UID: 0 PID: 5841 Comm: syz-executor153 Not tainted 6.16.0-rc4-syzkaller-00319-g05df91921da6 #0 PREEMPT(full) 
[   72.670769][ T5841] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
[   72.670780][ T5841] Call Trace:
[   72.670788][ T5841]  <TASK>
[   72.670794][ T5841]  dump_stack_lvl+0x189/0x250
[   72.670808][ T5841]  ? __pfx_dump_stack_lvl+0x10/0x10
[   72.670818][ T5841]  ? __pfx__printk+0x10/0x10
[   72.670831][ T5841]  ? print_lock_name+0xde/0x100
[   72.670844][ T5841]  print_circular_bug+0x2ee/0x310
[   72.670857][ T5841]  check_noncircular+0x134/0x160
[   72.670869][ T5841]  validate_chain+0xb9b/0x2140
[   72.670880][ T5841]  ? lockdep_unlock+0x89/0x120
[   72.670898][ T5841]  __lock_acquire+0xab9/0xd20
[   72.670908][ T5841]  ? ocfs2_setattr+0x969/0x1b40
[   72.670922][ T5841]  lock_acquire+0x120/0x360
[   72.670930][ T5841]  ? ocfs2_setattr+0x969/0x1b40
[   72.670945][ T5841]  ? do_raw_spin_unlock+0x122/0x240
[   72.670958][ T5841]  ocfs2_start_trans+0x26b/0x6d0
[   72.670970][ T5841]  ? ocfs2_setattr+0x969/0x1b40
[   72.670984][ T5841]  ? __pfx_ocfs2_start_trans+0x10/0x10
[   72.670994][ T5841]  ? setattr_prepare+0x1e7/0xac0
[   72.671009][ T5841]  ocfs2_setattr+0x969/0x1b40
[   72.671025][ T5841]  ? __pfx_ocfs2_setattr+0x10/0x10
[   72.671039][ T5841]  ? smk_tskacc+0x2fc/0x370
[   72.671051][ T5841]  ? smack_inode_setattr+0x17b/0x200
[   72.671063][ T5841]  ? __pfx_smack_inode_setattr+0x10/0x10
[   72.671077][ T5841]  ? current_time+0x222/0x370
[   72.671087][ T5841]  ? evm_inode_setattr+0x1bd/0x7d0
[   72.671096][ T5841]  ? __pfx_current_time+0x10/0x10
[   72.671108][ T5841]  ? try_break_deleg+0x79/0x130
[   72.671120][ T5841]  ? __pfx_ocfs2_setattr+0x10/0x10
[   72.671133][ T5841]  notify_change+0xb33/0xe40
[   72.671147][ T5841]  ovl_workdir_create+0x658/0x7f0
[   72.671161][ T5841]  ? __pfx_ovl_workdir_create+0x10/0x10
[   72.671174][ T5841]  ? mnt_get_write_access+0x223/0x2a0
[   72.671188][ T5841]  ovl_get_workdir+0x32c/0x1730
[   72.671200][ T5841]  ? __pfx_ovl_get_workdir+0x10/0x10
[   72.671211][ T5841]  ? __lock_acquire+0xab9/0xd20
[   72.671222][ T5841]  ? do_raw_spin_lock+0x121/0x290
[   72.671236][ T5841]  ? do_raw_spin_unlock+0x122/0x240
[   72.671248][ T5841]  ? _raw_spin_unlock+0x28/0x50
[   72.671261][ T5841]  ? ovl_inuse_trylock+0xae/0xf0
[   72.671272][ T5841]  ovl_fill_super+0x1386/0x35d0
[   72.671284][ T5841]  ? rcu_is_watching+0x15/0xb0
[   72.671297][ T5841]  ? shrinker_register+0x124/0x230
[   72.671309][ T5841]  ? __pfx_ovl_fill_super+0x10/0x10
[   72.671320][ T5841]  ? __pfx___mutex_lock+0x10/0x10
[   72.671329][ T5841]  ? __pfx___mutex_unlock_slowpath+0x10/0x10
[   72.671340][ T5841]  ? __raw_spin_lock_init+0x45/0x100
[   72.671354][ T5841]  ? sget_fc+0x962/0xa40
[   72.671367][ T5841]  ? __pfx_set_anon_super_fc+0x10/0x10
[   72.671379][ T5841]  ? __pfx_ovl_fill_super+0x10/0x10
[   72.671390][ T5841]  get_tree_nodev+0xbb/0x150
[   72.671403][ T5841]  vfs_get_tree+0x8f/0x2b0
[   72.671417][ T5841]  do_new_mount+0x24a/0xa40
[   72.671428][ T5841]  __se_sys_mount+0x317/0x410
[   72.671438][ T5841]  ? __pfx___se_sys_mount+0x10/0x10
[   72.671447][ T5841]  ? rcu_is_watching+0x15/0xb0
[   72.671458][ T5841]  ? __x64_sys_mount+0x20/0xc0
[   72.671467][ T5841]  do_syscall_64+0xfa/0x3b0
[   72.671477][ T5841]  ? lockdep_hardirqs_on+0x9c/0x150
[   72.671491][ T5841]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   72.671500][ T5841]  ? clear_bhb_loop+0x60/0xb0
[   72.671511][ T5841]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   72.671520][ T5841] RIP: 0033:0x7fdbe50f9bd9
[   72.671533][ T5841] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[   72.671545][ T5841] RSP: 002b:00007fff5f1e73d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[   72.671556][ T5841] RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007fdbe50f9bd9
[   72.671563][ T5841] RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 0000000000000000
[   72.671570][ T5841] RBP: 00007fdbe51715f0 R08: 00002000000002c0 R09: 000055557fb8d4c0
[   72.671577][ T5841] R10: 0000000001000000 R11: 0000000000000246 R12: 00007fff5f1e7400
[pid  5841] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5841] exit_group(0)               = ?
[pid  5841] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5841, si_uid=0, si_status=0, si_utime=0, si_stime=18 /* 0.18 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5845 attached
, child_tidptr=0x55557fb8c650) = 5845
[   72.671583][ T5841] R13: 00007fff5f1e7628 R14: 431bde82d7b634db R15: 00007fdbe514203b
[   72.671593][ T5841]  </TASK>
[   73.074288][ T5841] overlayfs: upper fs does not support tmpfile.
[   73.081642][ T5841] overlayfs: upper fs does not support RENAME_WHITEOUT.
[   73.088923][ T5841] overlayfs: upper fs missing required features.
[pid  5845] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5845] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5845] setpgid(0, 0)               = 0
[pid  5845] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5845] write(3, "1000", 4)         = 4
[pid  5845] close(3)                    = 0
executing program
[pid  5845] write(1, "executing program\n", 18) = 18
[pid  5845] memfd_create("syzkaller", 0) = 3
[pid  5845] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5845] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5845] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5845] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5845] close(3)                    = 0
[pid  5845] mkdirat(AT_FDCWD, "./file0", 000) = 0
[pid  5845] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5845] mkdir("./bus", 000)         = 0
[pid  5845] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5845] exit_group(0)               = ?
[pid  5845] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5845, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=8 /* 0.08 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5846 attached
, child_tidptr=0x55557fb8c650) = 5846
[pid  5846] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5846] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   73.288363][ T5845] overlayfs: workdir and upperdir must reside under the same mount
[pid  5846] setpgid(0, 0)               = 0
[pid  5846] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5846] write(3, "1000", 4)         = 4
[pid  5846] close(3)                    = 0
executing program
[pid  5846] write(1, "executing program\n", 18) = 18
[pid  5846] memfd_create("syzkaller", 0) = 3
[pid  5846] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5846] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5846] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5846] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5846] close(3)                    = 0
[pid  5846] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5846] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5846] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5846] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5846] exit_group(0)               = ?
[pid  5846] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5846, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5847 attached
, child_tidptr=0x55557fb8c650) = 5847
[pid  5847] set_robust_list(0x55557fb8c660, 24) = 0
[   73.526259][ T5846] overlayfs: workdir and upperdir must reside under the same mount
[pid  5847] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5847] setpgid(0, 0)               = 0
[pid  5847] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5847] write(3, "1000", 4)         = 4
[pid  5847] close(3)                    = 0
executing program
[pid  5847] write(1, "executing program\n", 18) = 18
[pid  5847] memfd_create("syzkaller", 0) = 3
[pid  5847] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5847] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5847] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5847] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5847] close(3)                    = 0
[pid  5847] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5847] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5847] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5847] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5847] exit_group(0)               = ?
[pid  5847] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5847, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=10 /* 0.10 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55557fb8c650) = 5848
./strace-static-x86_64: Process 5848 attached
[pid  5848] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5848] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5848] setpgid(0, 0)               = 0
[   73.746548][ T5847] overlayfs: workdir and upperdir must reside under the same mount
[pid  5848] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5848] write(3, "1000", 4)         = 4
[pid  5848] close(3)                    = 0
[pid  5848] write(1, "executing program\n", 18executing program
) = 18
[pid  5848] memfd_create("syzkaller", 0) = 3
[pid  5848] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5848] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5848] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5848] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5848] close(3)                    = 0
[pid  5848] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5848] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5848] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5848] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5848] exit_group(0)               = ?
[pid  5848] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5848, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5849 attached
, child_tidptr=0x55557fb8c650) = 5849
[pid  5849] set_robust_list(0x55557fb8c660, 24) = 0
[   74.026506][ T5848] overlayfs: workdir and upperdir must reside under the same mount
[pid  5849] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5849] setpgid(0, 0)               = 0
[pid  5849] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5849] write(3, "1000", 4)         = 4
[pid  5849] close(3)                    = 0
[pid  5849] write(1, "executing program\n", 18executing program
) = 18
[pid  5849] memfd_create("syzkaller", 0) = 3
[pid  5849] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5849] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5849] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5849] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5849] close(3)                    = 0
[pid  5849] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5849] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5849] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5849] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5849] exit_group(0)               = ?
[pid  5849] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5849, si_uid=0, si_status=0, si_utime=0, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5850 attached
 <unfinished ...>
[pid  5850] set_robust_list(0x55557fb8c660, 24 <unfinished ...>
[pid  5840] <... clone resumed>, child_tidptr=0x55557fb8c650) = 5850
[pid  5850] <... set_robust_list resumed>) = 0
[pid  5850] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   74.288601][ T5849] overlayfs: workdir and upperdir must reside under the same mount
[pid  5850] setpgid(0, 0)               = 0
[pid  5850] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5850] write(3, "1000", 4)         = 4
[pid  5850] close(3)                    = 0
[pid  5850] write(1, "executing program\n", 18executing program
) = 18
[pid  5850] memfd_create("syzkaller", 0) = 3
[pid  5850] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5850] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5850] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5850] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5850] close(3)                    = 0
[pid  5850] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5850] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5850] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5850] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5850] exit_group(0)               = ?
[pid  5850] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5850, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=7 /* 0.07 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5851 attached
, child_tidptr=0x55557fb8c650) = 5851
[pid  5851] set_robust_list(0x55557fb8c660, 24) = 0
[   74.538799][ T5850] overlayfs: workdir and upperdir must reside under the same mount
[pid  5851] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5851] setpgid(0, 0)               = 0
[pid  5851] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5851] write(3, "1000", 4)         = 4
[pid  5851] close(3)                    = 0
[pid  5851] write(1, "executing program\n", 18executing program
) = 18
[pid  5851] memfd_create("syzkaller", 0) = 3
[pid  5851] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5851] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5851] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5851] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5851] close(3)                    = 0
[pid  5851] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5851] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5851] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5851] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5851] exit_group(0)               = ?
[pid  5851] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5851, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5852 attached
, child_tidptr=0x55557fb8c650) = 5852
[pid  5852] set_robust_list(0x55557fb8c660, 24) = 0
[   74.801337][ T5851] overlayfs: workdir and upperdir must reside under the same mount
[pid  5852] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5852] setpgid(0, 0)               = 0
[pid  5852] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5852] write(3, "1000", 4)         = 4
[pid  5852] close(3)                    = 0
[pid  5852] write(1, "executing program\n", 18executing program
) = 18
[pid  5852] memfd_create("syzkaller", 0) = 3
[pid  5852] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5852] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5852] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5852] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5852] close(3)                    = 0
[pid  5852] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5852] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5852] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5852] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5852] exit_group(0)               = ?
[pid  5852] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5852, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5853 attached
, child_tidptr=0x55557fb8c650) = 5853
[pid  5853] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5853] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5853] setpgid(0, 0)               = 0
[pid  5853] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5853] write(3, "1000", 4)         = 4
[pid  5853] close(3)                    = 0
[pid  5853] write(1, "executing program\n", 18executing program
) = 18
[   75.061463][ T5852] overlayfs: workdir and upperdir must reside under the same mount
[pid  5853] memfd_create("syzkaller", 0) = 3
[pid  5853] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5853] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5853] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5853] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5853] close(3)                    = 0
[pid  5853] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5853] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5853] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5853] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5853] exit_group(0)               = ?
[pid  5853] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5853, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=11 /* 0.11 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5854 attached
 <unfinished ...>
[pid  5854] set_robust_list(0x55557fb8c660, 24 <unfinished ...>
[pid  5840] <... clone resumed>, child_tidptr=0x55557fb8c650) = 5854
[pid  5854] <... set_robust_list resumed>) = 0
[pid  5854] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5854] setpgid(0, 0)               = 0
[pid  5854] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5854] write(3, "1000", 4)         = 4
[   75.295268][ T5853] overlayfs: workdir and upperdir must reside under the same mount
[pid  5854] close(3)                    = 0
executing program
[pid  5854] write(1, "executing program\n", 18) = 18
[pid  5854] memfd_create("syzkaller", 0) = 3
[pid  5854] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5854] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5854] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5854] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5854] close(3)                    = 0
[pid  5854] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5854] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5854] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5854] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5854] exit_group(0)               = ?
[pid  5854] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5854, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5855 attached
[   75.547051][ T5854] overlayfs: workdir and upperdir must reside under the same mount
 <unfinished ...>
[pid  5855] set_robust_list(0x55557fb8c660, 24 <unfinished ...>
[pid  5840] <... clone resumed>, child_tidptr=0x55557fb8c650) = 5855
[pid  5855] <... set_robust_list resumed>) = 0
[pid  5855] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5855] setpgid(0, 0)               = 0
[pid  5855] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5855] write(3, "1000", 4)         = 4
[pid  5855] close(3)                    = 0
executing program
[pid  5855] write(1, "executing program\n", 18) = 18
[pid  5855] memfd_create("syzkaller", 0) = 3
[pid  5855] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5855] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5855] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5855] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5855] close(3)                    = 0
[pid  5855] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5855] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5855] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5855] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5855] exit_group(0)               = ?
[pid  5855] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5855, si_uid=0, si_status=0, si_utime=0, si_stime=11 /* 0.11 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   75.828723][ T5855] overlayfs: workdir and upperdir must reside under the same mount
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5856 attached
, child_tidptr=0x55557fb8c650) = 5856
[pid  5856] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5856] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5856] setpgid(0, 0)               = 0
[pid  5856] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5856] write(3, "1000", 4)         = 4
[pid  5856] close(3)                    = 0
executing program
[pid  5856] write(1, "executing program\n", 18) = 18
[pid  5856] memfd_create("syzkaller", 0) = 3
[pid  5856] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5856] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5856] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5856] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5856] close(3)                    = 0
[pid  5856] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5856] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5856] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5856] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5856] exit_group(0)               = ?
[pid  5856] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5856, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5857 attached
, child_tidptr=0x55557fb8c650) = 5857
[   76.109801][ T5856] overlayfs: workdir and upperdir must reside under the same mount
[pid  5857] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5857] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5857] setpgid(0, 0)               = 0
[pid  5857] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5857] write(3, "1000", 4)         = 4
[pid  5857] close(3)                    = 0
executing program
[pid  5857] write(1, "executing program\n", 18) = 18
[pid  5857] memfd_create("syzkaller", 0) = 3
[pid  5857] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5857] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5857] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5857] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5857] close(3)                    = 0
[pid  5857] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5857] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5857] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5857] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5857] exit_group(0)               = ?
[pid  5857] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5857, si_uid=0, si_status=0, si_utime=0, si_stime=11 /* 0.11 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5858 attached
 <unfinished ...>
[pid  5858] set_robust_list(0x55557fb8c660, 24 <unfinished ...>
[pid  5840] <... clone resumed>, child_tidptr=0x55557fb8c650) = 5858
[pid  5858] <... set_robust_list resumed>) = 0
[pid  5858] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5858] setpgid(0, 0)               = 0
[   76.383298][ T5857] overlayfs: workdir and upperdir must reside under the same mount
[pid  5858] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5858] write(3, "1000", 4)         = 4
[pid  5858] close(3)                    = 0
executing program
[pid  5858] write(1, "executing program\n", 18) = 18
[pid  5858] memfd_create("syzkaller", 0) = 3
[pid  5858] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5858] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5858] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5858] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5858] close(3)                    = 0
[pid  5858] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5858] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5858] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5858] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5858] exit_group(0)               = ?
[pid  5858] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5858, si_uid=0, si_status=0, si_utime=0, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   76.651655][ T5858] overlayfs: workdir and upperdir must reside under the same mount
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5859 attached
, child_tidptr=0x55557fb8c650) = 5859
[pid  5859] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5859] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5859] setpgid(0, 0)               = 0
[pid  5859] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5859] write(3, "1000", 4)         = 4
[pid  5859] close(3)                    = 0
executing program
[pid  5859] write(1, "executing program\n", 18) = 18
[pid  5859] memfd_create("syzkaller", 0) = 3
[pid  5859] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5859] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5859] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5859] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5859] close(3)                    = 0
[pid  5859] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5859] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5859] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5859] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5859] exit_group(0)               = ?
[pid  5859] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5859, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5860 attached
, child_tidptr=0x55557fb8c650) = 5860
[pid  5860] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5860] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5860] setpgid(0, 0)               = 0
[pid  5860] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5860] write(3, "1000", 4)         = 4
[   76.941710][ T5859] overlayfs: workdir and upperdir must reside under the same mount
[pid  5860] close(3)                    = 0
executing program
[pid  5860] write(1, "executing program\n", 18) = 18
[pid  5860] memfd_create("syzkaller", 0) = 3
[pid  5860] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5860] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5860] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5860] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5860] close(3)                    = 0
[pid  5860] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5860] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5860] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5860] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5860] exit_group(0)               = ?
[pid  5860] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5860, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5861 attached
, child_tidptr=0x55557fb8c650) = 5861
[pid  5861] set_robust_list(0x55557fb8c660, 24) = 0
[   77.183433][ T5860] overlayfs: workdir and upperdir must reside under the same mount
[pid  5861] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5861] setpgid(0, 0)               = 0
[pid  5861] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5861] write(3, "1000", 4)         = 4
[pid  5861] close(3)                    = 0
[pid  5861] write(1, "executing program\n", 18executing program
) = 18
[pid  5861] memfd_create("syzkaller", 0) = 3
[pid  5861] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5861] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5861] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5861] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5861] close(3)                    = 0
[pid  5861] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5861] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5861] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5861] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5861] exit_group(0)               = ?
[pid  5861] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5861, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5862 attached
, child_tidptr=0x55557fb8c650) = 5862
[   77.456136][ T5861] overlayfs: workdir and upperdir must reside under the same mount
[pid  5862] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5862] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5862] setpgid(0, 0)               = 0
[pid  5862] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5862] write(3, "1000", 4)         = 4
[pid  5862] close(3)                    = 0
executing program
[pid  5862] write(1, "executing program\n", 18) = 18
[pid  5862] memfd_create("syzkaller", 0) = 3
[pid  5862] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5862] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5862] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5862] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5862] close(3)                    = 0
[pid  5862] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5862] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5862] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5862] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5862] exit_group(0)               = ?
[pid  5862] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5862, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5863 attached
, child_tidptr=0x55557fb8c650) = 5863
[pid  5863] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5863] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5863] setpgid(0, 0)               = 0
[pid  5863] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[   77.747804][ T5862] overlayfs: workdir and upperdir must reside under the same mount
[pid  5863] write(3, "1000", 4)         = 4
[pid  5863] close(3)                    = 0
executing program
[pid  5863] write(1, "executing program\n", 18) = 18
[pid  5863] memfd_create("syzkaller", 0) = 3
[pid  5863] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5863] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5863] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5863] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5863] close(3)                    = 0
[pid  5863] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5863] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5863] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5863] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5863] exit_group(0)               = ?
[pid  5863] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5863, si_uid=0, si_status=0, si_utime=0, si_stime=11 /* 0.11 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5864 attached
, child_tidptr=0x55557fb8c650) = 5864
[pid  5864] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5864] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5864] setpgid(0, 0)               = 0
[pid  5864] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5864] write(3, "1000", 4)         = 4
[pid  5864] close(3)                    = 0
executing program
[pid  5864] write(1, "executing program\n", 18) = 18
[pid  5864] memfd_create("syzkaller", 0) = 3
[pid  5864] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[   77.989371][ T5863] overlayfs: workdir and upperdir must reside under the same mount
[pid  5864] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5864] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5864] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5864] close(3)                    = 0
[pid  5864] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5864] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5864] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5864] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5864] exit_group(0)               = ?
[pid  5864] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5864, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55557fb8c650) = 5865
./strace-static-x86_64: Process 5865 attached
[pid  5865] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5865] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   78.206559][ T5864] overlayfs: workdir and upperdir must reside under the same mount
[pid  5865] setpgid(0, 0)               = 0
[pid  5865] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5865] write(3, "1000", 4)         = 4
[pid  5865] close(3)                    = 0
[pid  5865] write(1, "executing program\n", 18executing program
) = 18
[pid  5865] memfd_create("syzkaller", 0) = 3
[pid  5865] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5865] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5865] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5865] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5865] close(3)                    = 0
[pid  5865] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5865] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5865] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5865] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5865] exit_group(0)               = ?
[pid  5865] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5865, si_uid=0, si_status=0, si_utime=0, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5866 attached
, child_tidptr=0x55557fb8c650) = 5866
[pid  5866] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5866] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5866] setpgid(0, 0)               = 0
[   78.467397][ T5865] overlayfs: workdir and upperdir must reside under the same mount
[pid  5866] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5866] write(3, "1000", 4)         = 4
[pid  5866] close(3)                    = 0
[pid  5866] write(1, "executing program\n", 18executing program
) = 18
[pid  5866] memfd_create("syzkaller", 0) = 3
[pid  5866] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5866] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5866] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5866] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5866] close(3)                    = 0
[pid  5866] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5866] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5866] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5866] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5866] exit_group(0)               = ?
[pid  5866] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5866, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5868 attached
, child_tidptr=0x55557fb8c650) = 5868
[pid  5868] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5868] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5868] setpgid(0, 0)               = 0
[pid  5868] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[   78.738092][ T5866] overlayfs: workdir and upperdir must reside under the same mount
[pid  5868] write(3, "1000", 4)         = 4
[pid  5868] close(3)                    = 0
executing program
[pid  5868] write(1, "executing program\n", 18) = 18
[pid  5868] memfd_create("syzkaller", 0) = 3
[pid  5868] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5868] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5868] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5868] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5868] close(3)                    = 0
[pid  5868] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5868] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5868] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5868] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5868] exit_group(0)               = ?
[pid  5868] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5868, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5869 attached
, child_tidptr=0x55557fb8c650) = 5869
[pid  5869] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5869] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5869] setpgid(0, 0)               = 0
[pid  5869] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5869] write(3, "1000", 4)         = 4
[pid  5869] close(3)                    = 0
executing program
[pid  5869] write(1, "executing program\n", 18) = 18
[pid  5869] memfd_create("syzkaller", 0) = 3
[pid  5869] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[   78.954550][ T5868] overlayfs: workdir and upperdir must reside under the same mount
[pid  5869] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5869] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5869] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5869] close(3)                    = 0
[pid  5869] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5869] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5869] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5869] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5869] exit_group(0)               = ?
[pid  5869] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5869, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5872 attached
, child_tidptr=0x55557fb8c650) = 5872
[   79.184120][ T5869] overlayfs: workdir and upperdir must reside under the same mount
[pid  5872] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5872] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5872] setpgid(0, 0)               = 0
[pid  5872] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5872] write(3, "1000", 4)         = 4
[pid  5872] close(3)                    = 0
executing program
[pid  5872] write(1, "executing program\n", 18) = 18
[pid  5872] memfd_create("syzkaller", 0) = 3
[pid  5872] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5872] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5872] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5872] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5872] close(3)                    = 0
[pid  5872] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5872] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5872] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5872] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5872] exit_group(0)               = ?
[pid  5872] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5872, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=10 /* 0.10 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5873 attached
, child_tidptr=0x55557fb8c650) = 5873
[pid  5873] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5873] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5873] setpgid(0, 0)               = 0
[pid  5873] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5873] write(3, "1000", 4)         = 4
[pid  5873] close(3)                    = 0
executing program
[pid  5873] write(1, "executing program\n", 18) = 18
[pid  5873] memfd_create("syzkaller", 0) = 3
[pid  5873] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[   79.453759][ T5872] overlayfs: workdir and upperdir must reside under the same mount
[pid  5873] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5873] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5873] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5873] close(3)                    = 0
[pid  5873] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5873] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5873] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5873] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5873] exit_group(0)               = ?
[pid  5873] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5873, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   79.641716][ T5873] overlayfs: workdir and upperdir must reside under the same mount
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5875 attached
, child_tidptr=0x55557fb8c650) = 5875
[pid  5875] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5875] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5875] setpgid(0, 0)               = 0
[pid  5875] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5875] write(3, "1000", 4)         = 4
[pid  5875] close(3)                    = 0
executing program
[pid  5875] write(1, "executing program\n", 18) = 18
[pid  5875] memfd_create("syzkaller", 0) = 3
[pid  5875] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5875] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5875] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5875] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5875] close(3)                    = 0
[pid  5875] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5875] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5875] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5875] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5875] exit_group(0)               = ?
[pid  5875] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5875, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5876 attached
 <unfinished ...>
[pid  5876] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5876] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5840] <... clone resumed>, child_tidptr=0x55557fb8c650) = 5876
[pid  5876] setpgid(0, 0)               = 0
[pid  5876] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5876] write(3, "1000", 4)         = 4
[pid  5876] close(3)                    = 0
executing program
[pid  5876] write(1, "executing program\n", 18) = 18
[pid  5876] memfd_create("syzkaller", 0) = 3
[pid  5876] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[   79.921043][ T5875] overlayfs: workdir and upperdir must reside under the same mount
[pid  5876] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5876] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5876] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5876] close(3)                    = 0
[pid  5876] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5876] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5876] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5876] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5876] exit_group(0)               = ?
[pid  5876] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5876, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5878 attached
 <unfinished ...>
[pid  5878] set_robust_list(0x55557fb8c660, 24 <unfinished ...>
[pid  5840] <... clone resumed>, child_tidptr=0x55557fb8c650) = 5878
[pid  5878] <... set_robust_list resumed>) = 0
[pid  5878] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5878] setpgid(0, 0)               = 0
[pid  5878] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5878] write(3, "1000", 4)         = 4
[pid  5878] close(3)                    = 0
[pid  5878] write(1, "executing program\n", 18executing program
[   80.129331][ T5876] overlayfs: workdir and upperdir must reside under the same mount
) = 18
[pid  5878] memfd_create("syzkaller", 0) = 3
[pid  5878] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5878] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5878] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5878] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5878] close(3)                    = 0
[pid  5878] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5878] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5878] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5878] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5878] exit_group(0)               = ?
[pid  5878] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5878, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5879 attached
, child_tidptr=0x55557fb8c650) = 5879
[pid  5879] set_robust_list(0x55557fb8c660, 24) = 0
[   80.372726][ T5878] overlayfs: workdir and upperdir must reside under the same mount
[pid  5879] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5879] setpgid(0, 0)               = 0
[pid  5879] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5879] write(3, "1000", 4)         = 4
[pid  5879] close(3)                    = 0
executing program
[pid  5879] write(1, "executing program\n", 18) = 18
[pid  5879] memfd_create("syzkaller", 0) = 3
[pid  5879] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5879] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5879] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5879] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5879] close(3)                    = 0
[pid  5879] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5879] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5879] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5879] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5879] exit_group(0)               = ?
[pid  5879] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5879, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=11 /* 0.11 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5881 attached
, child_tidptr=0x55557fb8c650) = 5881
[pid  5881] set_robust_list(0x55557fb8c660, 24) = 0
[   80.626761][ T5879] overlayfs: workdir and upperdir must reside under the same mount
[pid  5881] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5881] setpgid(0, 0)               = 0
[pid  5881] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5881] write(3, "1000", 4)         = 4
[pid  5881] close(3)                    = 0
[pid  5881] write(1, "executing program\n", 18executing program
) = 18
[pid  5881] memfd_create("syzkaller", 0) = 3
[pid  5881] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5881] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5881] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5881] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5881] close(3)                    = 0
[pid  5881] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5881] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5881] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5881] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5881] exit_group(0)               = ?
[pid  5881] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5881, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5882 attached
, child_tidptr=0x55557fb8c650) = 5882
[pid  5882] set_robust_list(0x55557fb8c660, 24) = 0
[   80.899430][ T5881] overlayfs: workdir and upperdir must reside under the same mount
[pid  5882] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5882] setpgid(0, 0)               = 0
[pid  5882] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5882] write(3, "1000", 4)         = 4
[pid  5882] close(3)                    = 0
[pid  5882] write(1, "executing program\n", 18executing program
) = 18
[pid  5882] memfd_create("syzkaller", 0) = 3
[pid  5882] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5882] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5882] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5882] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5882] close(3)                    = 0
[pid  5882] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5882] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5882] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5882] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5882] exit_group(0)               = ?
[pid  5882] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5882, si_uid=0, si_status=0, si_utime=0, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5883 attached
, child_tidptr=0x55557fb8c650) = 5883
[pid  5883] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5883] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5883] setpgid(0, 0)               = 0
[pid  5883] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5883] write(3, "1000", 4)         = 4
[   81.180711][ T5882] overlayfs: workdir and upperdir must reside under the same mount
[pid  5883] close(3)                    = 0
executing program
[pid  5883] write(1, "executing program\n", 18) = 18
[pid  5883] memfd_create("syzkaller", 0) = 3
[pid  5883] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5883] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5883] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5883] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5883] close(3)                    = 0
[pid  5883] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5883] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5883] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5883] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5883] exit_group(0)               = ?
[pid  5883] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5883, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5884 attached
, child_tidptr=0x55557fb8c650) = 5884
[pid  5884] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5884] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   81.419957][ T5883] overlayfs: workdir and upperdir must reside under the same mount
[pid  5884] setpgid(0, 0)               = 0
[pid  5884] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5884] write(3, "1000", 4)         = 4
[pid  5884] close(3)                    = 0
executing program
[pid  5884] write(1, "executing program\n", 18) = 18
[pid  5884] memfd_create("syzkaller", 0) = 3
[pid  5884] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5884] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5884] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5884] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5884] close(3)                    = 0
[pid  5884] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5884] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5884] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5884] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5884] exit_group(0)               = ?
[pid  5884] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5884, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=13 /* 0.13 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5885 attached
, child_tidptr=0x55557fb8c650) = 5885
[pid  5885] set_robust_list(0x55557fb8c660, 24) = 0
[pid  5885] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5885] setpgid(0, 0)               = 0
[   81.704808][ T5884] overlayfs: workdir and upperdir must reside under the same mount
[pid  5885] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5885] write(3, "1000", 4)         = 4
[pid  5885] close(3)                    = 0
executing program
[pid  5885] write(1, "executing program\n", 18) = 18
[pid  5885] memfd_create("syzkaller", 0) = 3
[pid  5885] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000
[pid  5885] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5885] munmap(0x7fdbdcc00000, 138412032) = 0
[pid  5885] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5885] close(3)                    = 0
[pid  5885] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5885] mkdirat(AT_FDCWD, "./file1", 000) = -1 EEXIST (File exists)
[pid  5885] mkdir("./bus", 000)         = -1 EEXIST (File exists)
[pid  5885] mount(NULL, "./bus", "overlay", MS_STRICTATIME, "upperdir=./file1,lowerdir=./file0,workdir=./bus,") = -1 EINVAL (Invalid argument)
[pid  5885] exit_group(0)               = ?
[pid  5885] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5885, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5886 attached
, child_tidptr=0x55557fb8c650) = 5886
[pid  5886] set_robust_list(0x55557fb8c660, 24) = 0
[   81.954429][ T5885] overlayfs: workdir and upperdir must reside under the same mount
[pid  5886] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5886] setpgid(0, 0)               = 0
[pid  5886] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5886] write(3, "1000", 4)         = 4
[pid  5886] close(3)                    = 0
executing program
[pid  5886] write(1, "executing program\n", 18) = 18
[pid  5886] memfd_create("syzkaller", 0) = 3
[pid  5886] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdbdcc00000