./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2577124577

<...>
Warning: Permanently added '10.128.0.135' (ED25519) to the list of known hosts.
execve("./syz-executor2577124577", ["./syz-executor2577124577"], 0x7ffd2044c8b0 /* 10 vars */) = 0
brk(NULL)                               = 0x555568ffe000
brk(0x555568ffed00)                     = 0x555568ffed00
arch_prctl(ARCH_SET_FS, 0x555568ffe380) = 0
set_tid_address(0x555568ffe650)         = 5821
set_robust_list(0x555568ffe660, 24)     = 0
rseq(0x555568ffeca0, 0x20, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor2577124577", 4096) = 28
getrandom("\x51\x7b\x00\x31\x32\x49\x26\x5f", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x555568ffed00
brk(0x55556901fd00)                     = 0x55556901fd00
brk(0x555569020000)                     = 0x555569020000
mprotect(0x7fbe2fc66000, 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 5822 attached
 <unfinished ...>
[pid  5822] set_robust_list(0x555568ffe660, 24) = 0
[pid  5822] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5822] setpgid(0, 0)               = 0
[pid  5822] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC <unfinished ...>
[pid  5821] <... clone resumed>, child_tidptr=0x555568ffe650) = 5822
[pid  5822] <... openat resumed>)       = 3
[pid  5822] write(3, "1000", 4)         = 4
[pid  5822] close(3executing program
)                    = 0
[pid  5822] write(1, "executing program\n", 18) = 18
[pid  5822] memfd_create("syzkaller", 0) = 3
[pid  5822] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5822] 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  5822] munmap(0x7fbe27600000, 138412032) = 0
[pid  5822] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid  5822] ioctl(4, LOOP_SET_FD, 3)    = 0
[pid  5822] close(3)                    = 0
[pid  5822] close(4)                    = 0
[pid  5822] mkdir("./file1", 0777)      = 0
[   88.166695][ T5822] loop0: detected capacity change from 0 to 32768
[   88.182579][ T5822] =======================================================
[   88.182579][ T5822] WARNING: The mand mount option has been deprecated and
[   88.182579][ T5822]          and is ignored by this kernel. Remove the mand
[   88.182579][ T5822]          option from the mount to silence this warning.
[pid  5822] mount("/dev/loop0", "./file1", "ocfs2", MS_MANDLOCK|MS_DIRSYNC|MS_NODIRATIME, "acl,heartbeat=none,nouser_xattr,coherency=full,data=writeback,localalloc=00000000000000000001,acl,no"...) = 0
[pid  5822] openat(AT_FDCWD, "./file1", O_RDONLY|O_DIRECTORY) = 3
[pid  5822] chdir("./file1")            = 0
[pid  5822] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5822] mkdirat(AT_FDCWD, "./file0", 0700) = 0
[pid  5822] mkdirat(AT_FDCWD, "./bus", 000) = 0
[   88.182579][ T5822] =======================================================
[   88.233896][ T5822] ocfs2: Mounting device (7,0) on (node local, slot 0) with writeback data mode.
[   88.291712][ T5822] overlayfs: upper fs does not support tmpfile.
[   88.300618][ T5822] overlayfs: upper fs does not support RENAME_WHITEOUT.
[   88.308107][ T5822] 
[   88.310445][ T5822] ======================================================
[   88.317547][ T5822] WARNING: possible circular locking dependency detected
[   88.324568][ T5822] 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 Not tainted
[   88.331667][ T5822] ------------------------------------------------------
[   88.338674][ T5822] syz-executor257/5822 is trying to acquire lock:
[   88.345077][ T5822] ffff888074405100 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x15e/0x45f0
[   88.358333][ T5822] 
[   88.358333][ T5822] but task is already holding lock:
[   88.365694][ T5822] ffff8880744aeab8 (&oi->ip_xattr_sem){+.+.}-{4:4}, at: ocfs2_xattr_set+0x40f/0x11f0
[   88.375271][ T5822] 
[   88.375271][ T5822] which lock already depends on the new lock.
[   88.375271][ T5822] 
[   88.385678][ T5822] 
[   88.385678][ T5822] the existing dependency chain (in reverse order) is:
[   88.394691][ T5822] 
[   88.394691][ T5822] -> #4 (&oi->ip_xattr_sem){+.+.}-{4:4}:
[   88.402519][ T5822]        lock_acquire+0x120/0x360
[   88.407555][ T5822]        down_write+0x96/0x1f0
[   88.412335][ T5822]        ocfs2_xattr_set_handle+0x3b0/0x7a0
[   88.418233][ T5822]        ocfs2_init_security_set+0xbd/0xe0
[   88.424042][ T5822]        ocfs2_mknod+0x137f/0x2050
[   88.429161][ T5822]        ocfs2_mkdir+0x191/0x440
[   88.434118][ T5822]        vfs_mkdir+0x303/0x510
[   88.438883][ T5822]        do_mkdirat+0x247/0x590
[   88.443743][ T5822]        __x64_sys_mkdirat+0x87/0xa0
[   88.449032][ T5822]        do_syscall_64+0xf6/0x210
[   88.454061][ T5822]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   88.460483][ T5822] 
[   88.460483][ T5822] -> #3 (jbd2_handle){.+.+}-{0:0}:
[   88.467787][ T5822]        lock_acquire+0x120/0x360
[   88.472819][ T5822]        start_this_handle+0x1fa7/0x21c0
[   88.478459][ T5822]        jbd2__journal_start+0x2c1/0x5b0
[   88.484095][ T5822]        jbd2_journal_start+0x2a/0x40
[   88.489470][ T5822]        ocfs2_start_trans+0x376/0x6d0
[   88.494934][ T5822]        ocfs2_reserve_suballoc_bits+0x711/0x45f0
[   88.501358][ T5822]        ocfs2_reserve_new_metadata_blocks+0x403/0x940
[   88.508389][ T5822]        ocfs2_mknod+0xe08/0x2050
[   88.513424][ T5822]        ocfs2_mkdir+0x191/0x440
[   88.518369][ T5822]        vfs_mkdir+0x303/0x510
[   88.523136][ T5822]        do_mkdirat+0x247/0x590
[   88.527988][ T5822]        __x64_sys_mkdirat+0x87/0xa0
[   88.533274][ T5822]        do_syscall_64+0xf6/0x210
[   88.538301][ T5822]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   88.544718][ T5822] 
[   88.544718][ T5822] -> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
[   88.553238][ T5822]        lock_acquire+0x120/0x360
[   88.558266][ T5822]        down_read+0x46/0x2e0
[   88.562948][ T5822]        ocfs2_start_trans+0x36a/0x6d0
[   88.568417][ T5822]        ocfs2_reserve_suballoc_bits+0x711/0x45f0
[   88.574843][ T5822]        ocfs2_reserve_new_metadata_blocks+0x403/0x940
[   88.581790][ T5822]        ocfs2_mknod+0xe08/0x2050
[   88.586820][ T5822]        ocfs2_mkdir+0x191/0x440
[   88.591760][ T5822]        vfs_mkdir+0x303/0x510
[   88.596539][ T5822]        do_mkdirat+0x247/0x590
[   88.601392][ T5822]        __x64_sys_mkdirat+0x87/0xa0
[   88.606695][ T5822]        do_syscall_64+0xf6/0x210
[   88.611734][ T5822]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   88.618146][ T5822] 
[   88.618146][ T5822] -> #1 (sb_internal#2){.+.+}-{0:0}:
[   88.625634][ T5822]        lock_acquire+0x120/0x360
[   88.630662][ T5822]        ocfs2_start_trans+0x26b/0x6d0
[   88.636119][ T5822]        ocfs2_reserve_suballoc_bits+0x711/0x45f0
[   88.642541][ T5822]        ocfs2_reserve_new_metadata_blocks+0x403/0x940
[   88.649399][ T5822]        ocfs2_mknod+0xe08/0x2050
[   88.654439][ T5822]        ocfs2_mkdir+0x191/0x440
[   88.659382][ T5822]        vfs_mkdir+0x303/0x510
[   88.664254][ T5822]        do_mkdirat+0x247/0x590
[   88.669110][ T5822]        __x64_sys_mkdirat+0x87/0xa0
[   88.674402][ T5822]        do_syscall_64+0xf6/0x210
[   88.679458][ T5822]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   88.685874][ T5822] 
[   88.685874][ T5822] -> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{4:4}:
[   88.696399][ T5822]        validate_chain+0xb9b/0x2140
[   88.701698][ T5822]        __lock_acquire+0xaac/0xd20
[   88.706899][ T5822]        lock_acquire+0x120/0x360
[   88.711926][ T5822]        down_write+0x96/0x1f0
[   88.716710][ T5822]        ocfs2_reserve_suballoc_bits+0x15e/0x45f0
[   88.723142][ T5822]        ocfs2_reserve_clusters_with_limit+0x2fb/0xba0
[   88.730015][ T5822]        ocfs2_init_xattr_set_ctxt+0x376/0x700
[   88.736172][ T5822]        ocfs2_xattr_set+0xb70/0x11f0
[   88.741545][ T5822]        __vfs_setxattr+0x439/0x480
[   88.746748][ T5822]        __vfs_setxattr_noperm+0x12d/0x660
[   88.752559][ T5822]        vfs_setxattr+0x16b/0x2f0
[   88.757587][ T5822]        ovl_get_workdir+0xb86/0x1700
[   88.763048][ T5822]        ovl_fill_super+0x1386/0x35d0
[   88.768436][ T5822]        get_tree_nodev+0xb8/0x150
[   88.773553][ T5822]        vfs_get_tree+0x8f/0x2b0
[   88.778494][ T5822]        do_new_mount+0x24a/0xa40
[   88.783525][ T5822]        __se_sys_mount+0x317/0x410
[   88.788726][ T5822]        do_syscall_64+0xf6/0x210
[   88.793768][ T5822]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   88.800196][ T5822] 
[   88.800196][ T5822] other info that might help us debug this:
[   88.800196][ T5822] 
[   88.810505][ T5822] Chain exists of:
[   88.810505][ T5822]   &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4 --> jbd2_handle --> &oi->ip_xattr_sem
[   88.810505][ T5822] 
[   88.826249][ T5822]  Possible unsafe locking scenario:
[   88.826249][ T5822] 
[   88.833694][ T5822]        CPU0                    CPU1
[   88.839059][ T5822]        ----                    ----
[   88.844507][ T5822]   lock(&oi->ip_xattr_sem);
[   88.849100][ T5822]                                lock(jbd2_handle);
[   88.855696][ T5822]                                lock(&oi->ip_xattr_sem);
[   88.862815][ T5822]   lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4);
[   88.870115][ T5822] 
[   88.870115][ T5822]  *** DEADLOCK ***
[   88.870115][ T5822] 
[   88.878278][ T5822] 4 locks held by syz-executor257/5822:
[   88.883819][ T5822]  #0: ffff88807c8c40e0 (&type->s_umount_key#43/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970
[   88.893942][ T5822]  #1: ffff888021ad4420 (sb_writers#8){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
[   88.903096][ T5822]  #2: ffff8880744aed80 (&sb->s_type->i_mutex_key#16){++++}-{4:4}, at: vfs_setxattr+0x144/0x2f0
[   88.913565][ T5822]  #3: ffff8880744aeab8 (&oi->ip_xattr_sem){+.+.}-{4:4}, at: ocfs2_xattr_set+0x40f/0x11f0
[   88.923512][ T5822] 
[   88.923512][ T5822] stack backtrace:
[   88.929413][ T5822] CPU: 1 UID: 0 PID: 5822 Comm: syz-executor257 Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 PREEMPT(full) 
[   88.929433][ T5822] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
[   88.929449][ T5822] Call Trace:
[   88.929458][ T5822]  <TASK>
[   88.929469][ T5822]  dump_stack_lvl+0x189/0x250
[   88.929496][ T5822]  ? __pfx_dump_stack_lvl+0x10/0x10
[   88.929516][ T5822]  ? __pfx__printk+0x10/0x10
[   88.929541][ T5822]  ? print_lock_name+0xde/0x100
[   88.929564][ T5822]  print_circular_bug+0x2ee/0x310
[   88.929591][ T5822]  check_noncircular+0x134/0x160
[   88.929617][ T5822]  validate_chain+0xb9b/0x2140
[   88.929641][ T5822]  ? __mutex_unlock_slowpath+0x1cd/0x700
[   88.929662][ T5822]  ? __pfx___mutex_unlock_slowpath+0x10/0x10
[   88.929684][ T5822]  __lock_acquire+0xaac/0xd20
[   88.929705][ T5822]  ? ocfs2_reserve_suballoc_bits+0x15e/0x45f0
[   88.929728][ T5822]  lock_acquire+0x120/0x360
[   88.929747][ T5822]  ? ocfs2_reserve_suballoc_bits+0x15e/0x45f0
[   88.929772][ T5822]  ? unwind_next_frame+0xa5/0x2390
[   88.929788][ T5822]  ? __kasan_check_byte+0x12/0x40
[   88.929813][ T5822]  down_write+0x96/0x1f0
[   88.929832][ T5822]  ? ocfs2_reserve_suballoc_bits+0x15e/0x45f0
[   88.929855][ T5822]  ? __pfx_down_write+0x10/0x10
[   88.929873][ T5822]  ? is_bpf_text_address+0x26/0x2b0
[   88.929893][ T5822]  ? rcu_is_watching+0x15/0xb0
[   88.929913][ T5822]  ? __kasan_check_byte+0x12/0x40
[   88.929935][ T5822]  ? rcu_is_watching+0x15/0xb0
[   88.929957][ T5822]  ocfs2_reserve_suballoc_bits+0x15e/0x45f0
[   88.929983][ T5822]  ? is_bpf_text_address+0x292/0x2b0
[   88.930004][ T5822]  ? kernel_text_address+0xa5/0xe0
[   88.930023][ T5822]  ? __kernel_text_address+0xd/0x40
[   88.930041][ T5822]  ? unwind_get_return_address+0x4d/0x90
[   88.930057][ T5822]  ? __pfx_stack_trace_consume_entry+0x10/0x10
[   88.930073][ T5822]  ? arch_stack_walk+0xfc/0x150
[   88.930094][ T5822]  ? __pfx_ocfs2_reserve_suballoc_bits+0x10/0x10
[   88.930117][ T5822]  ? stack_trace_save+0x9c/0xe0
[   88.930137][ T5822]  ? __pfx_stack_trace_save+0x10/0x10
[   88.930154][ T5822]  ? check_path+0x21/0x40
[   88.930178][ T5822]  ? check_noncircular+0xe0/0x160
[   88.930204][ T5822]  ? lockdep_unlock+0x89/0x120
[   88.930221][ T5822]  ? validate_chain+0x897/0x2140
[   88.930244][ T5822]  ? do_new_mount+0x24a/0xa40
[   88.930273][ T5822]  ? __lock_acquire+0xaac/0xd20
[   88.930298][ T5822]  ? do_raw_spin_unlock+0x122/0x240
[   88.930315][ T5822]  ? _raw_spin_unlock+0x28/0x50
[   88.930328][ T5822]  ? ocfs2_alloc_should_use_local+0x152/0x310
[   88.930349][ T5822]  ? ocfs2_reserve_clusters_with_limit+0x16b/0xba0
[   88.930378][ T5822]  ocfs2_reserve_clusters_with_limit+0x2fb/0xba0
[   88.930407][ T5822]  ? __pfx_ocfs2_reserve_clusters_with_limit+0x10/0x10
[   88.930435][ T5822]  ? __pfx_ocfs2_calc_xattr_set_need+0x10/0x10
[   88.930457][ T5822]  ? __lock_acquire+0xaac/0xd20
[   88.930479][ T5822]  ocfs2_init_xattr_set_ctxt+0x376/0x700
[   88.930499][ T5822]  ? __pfx_ocfs2_init_xattr_set_ctxt+0x10/0x10
[   88.930517][ T5822]  ? ocfs2_xattr_set+0xb36/0x11f0
[   88.930534][ T5822]  ? up_write+0x1c4/0x420
[   88.930546][ T5822]  ? ocfs2_xattr_set+0x334/0x11f0
[   88.930562][ T5822]  ocfs2_xattr_set+0xb70/0x11f0
[   88.930585][ T5822]  ? __pfx_ocfs2_xattr_set+0x10/0x10
[   88.930604][ T5822]  ? smack_log+0xef/0x3f0
[   88.930626][ T5822]  ? smk_access+0x14c/0x4e0
[   88.930648][ T5822]  ? smk_tskacc+0x2fc/0x370
[   88.930671][ T5822]  ? posix_xattr_acl+0x93/0xc0
[   88.930691][ T5822]  ? evm_protect_xattr+0x4d4/0xa90
[   88.930711][ T5822]  ? __pfx_evm_protect_xattr+0x10/0x10
[   88.930728][ T5822]  ? safesetid_security_capable+0xa9/0x1a0
[   88.930744][ T5822]  ? __pfx_ocfs2_xattr_trusted_set+0x10/0x10
[   88.930761][ T5822]  __vfs_setxattr+0x439/0x480
[   88.930787][ T5822]  __vfs_setxattr_noperm+0x12d/0x660
[   88.930812][ T5822]  vfs_setxattr+0x16b/0x2f0
[   88.930836][ T5822]  ? __pfx_vfs_setxattr+0x10/0x10
[   88.930859][ T5822]  ? up_write+0x1c4/0x420
[   88.930874][ T5822]  ovl_get_workdir+0xb86/0x1700
[   88.930898][ T5822]  ? __pfx_ovl_get_workdir+0x10/0x10
[   88.930926][ T5822]  ? do_raw_spin_unlock+0x122/0x240
[   88.930943][ T5822]  ? _raw_spin_unlock+0x28/0x50
[   88.930956][ T5822]  ? ovl_inuse_trylock+0xae/0xf0
[   88.930975][ T5822]  ovl_fill_super+0x1386/0x35d0
[   88.930998][ T5822]  ? rcu_is_watching+0x15/0xb0
[   88.931022][ T5822]  ? shrinker_register+0x124/0x230
[   88.931044][ T5822]  ? __pfx_ovl_fill_super+0x10/0x10
[   88.931063][ T5822]  ? __pfx___mutex_lock+0x10/0x10
[   88.931080][ T5822]  ? __pfx___mutex_unlock_slowpath+0x10/0x10
[   88.931100][ T5822]  ? __raw_spin_lock_init+0x45/0x100
[   88.931120][ T5822]  ? sget_fc+0x962/0xa40
[   88.931144][ T5822]  ? __pfx_set_anon_super_fc+0x10/0x10
[   88.931163][ T5822]  ? __pfx_ovl_fill_super+0x10/0x10
[   88.931184][ T5822]  get_tree_nodev+0xb8/0x150
[   88.931204][ T5822]  vfs_get_tree+0x8f/0x2b0
[   88.931225][ T5822]  do_new_mount+0x24a/0xa40
[   88.931253][ T5822]  __se_sys_mount+0x317/0x410
[   88.931279][ T5822]  ? __pfx___se_sys_mount+0x10/0x10
[   88.931303][ T5822]  ? __x64_sys_mount+0x20/0xc0
[   88.931327][ T5822]  do_syscall_64+0xf6/0x210
[   88.931346][ T5822]  ? clear_bhb_loop+0x45/0xa0
[   88.931365][ T5822]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   88.931383][ T5822] RIP: 0033:0x7fbe2fbeeb99
[   88.931409][ T5822] 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
[   88.931422][ T5822] RSP: 002b:00007fffd5d69098 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[   88.931438][ T5822] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fbe2fbeeb99
[   88.931449][ T5822] RDX: 0000200000000000 RSI: 0000200000000080 RDI: 0000000000000000
[   88.931459][ T5822] RBP: 0030656c69662f2e R08: 0000200000000240 R09: 0000555568fff4c0
[   88.931470][ T5822] R10: 0000000000010000 R11: 0000000000000246 R12: 00007fffd5d690c0
[   88.931480][ T5822] R13: 00007fffd5d692e8 R14: 431bde82d7b634db R15: 00007fbe2fc3703b
[   88.931497][ T5822]  </TASK>
[pid  5822] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5822] exit_group(0)               = ?
[pid  5822] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5822, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=24 /* 0.24 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 5826 attached
, child_tidptr=0x555568ffe650) = 5826
[pid  5826] set_robust_list(0x555568ffe660, 24) = 0
[pid  5826] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   89.497007][ T5822] overlayfs: upper fs missing required features.
[pid  5826] setpgid(0, 0)               = 0
[pid  5826] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5826] write(3, "1000", 4)         = 4
[pid  5826] close(3executing program
)                    = 0
[pid  5826] write(1, "executing program\n", 18) = 18
[pid  5826] memfd_create("syzkaller", 0) = 3
[pid  5826] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5826] 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  5826] munmap(0x7fbe27600000, 138412032) = 0
[pid  5826] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5826] close(3)                    = 0
[pid  5826] mkdirat(AT_FDCWD, "./file0", 0700) = 0
[pid  5826] mkdirat(AT_FDCWD, "./bus", 000) = 0
[pid  5826] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = 0
[pid  5826] exit_group(0)               = ?
[pid  5826] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5826, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=12 /* 0.12 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 5827 attached
, child_tidptr=0x555568ffe650) = 5827
[pid  5827] set_robust_list(0x555568ffe660, 24) = 0
[pid  5827] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5827] setpgid(0, 0)               = 0
[pid  5827] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5827] write(3, "1000", 4)         = 4
[pid  5827] close(3)                    = 0
executing program
[pid  5827] write(1, "executing program\n", 18) = 18
[pid  5827] memfd_create("syzkaller", 0) = 3
[pid  5827] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5827] 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  5827] munmap(0x7fbe27600000, 138412032) = 0
[pid  5827] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5827] close(3)                    = 0
[pid  5827] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5827] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5827] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5827] exit_group(0)               = ?
[pid  5827] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5827, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=13 /* 0.13 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 5828 attached
, child_tidptr=0x555568ffe650) = 5828
[pid  5828] set_robust_list(0x555568ffe660, 24) = 0
[pid  5828] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5828] setpgid(0, 0)               = 0
[pid  5828] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5828] write(3, "1000", 4executing program
)         = 4
[pid  5828] close(3)                    = 0
[pid  5828] write(1, "executing program\n", 18) = 18
[pid  5828] memfd_create("syzkaller", 0) = 3
[pid  5828] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[   89.978615][ T5827] overlay: filesystem on ./file0 not supported as upperdir
[pid  5828] 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  5828] munmap(0x7fbe27600000, 138412032) = 0
[pid  5828] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5828] close(3)                    = 0
[pid  5828] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5828] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5828] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5828] exit_group(0)               = ?
[pid  5828] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5828, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=11 /* 0.11 s */} ---
[   90.207801][ T5828] overlay: filesystem on ./file0 not supported as upperdir
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 5829 attached
, child_tidptr=0x555568ffe650) = 5829
[pid  5829] set_robust_list(0x555568ffe660, 24) = 0
[pid  5829] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5829] setpgid(0, 0)               = 0
[pid  5829] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5829] write(3, "1000", 4)         = 4
[pid  5829] close(3)                    = 0
[pid  5829] write(1, "executing program\n", 18executing program
) = 18
[pid  5829] memfd_create("syzkaller", 0) = 3
[pid  5829] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5829] 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  5829] munmap(0x7fbe27600000, 138412032) = 0
[pid  5829] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5829] close(3)                    = 0
[pid  5829] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5829] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5829] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5829] exit_group(0)               = ?
[pid  5829] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5829, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=11 /* 0.11 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   90.538971][ T5829] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5830 attached
, child_tidptr=0x555568ffe650) = 5830
[pid  5830] set_robust_list(0x555568ffe660, 24) = 0
[pid  5830] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5830] setpgid(0, 0)               = 0
[pid  5830] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5830] write(3, "1000", 4)         = 4
[pid  5830] close(3)                    = 0
executing program
[pid  5830] write(1, "executing program\n", 18) = 18
[pid  5830] memfd_create("syzkaller", 0) = 3
[pid  5830] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5830] 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  5830] munmap(0x7fbe27600000, 138412032) = 0
[pid  5830] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5830] close(3)                    = 0
[pid  5830] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5830] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5830] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5830] exit_group(0)               = ?
[pid  5830] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5830, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=13 /* 0.13 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 5831 attached
, child_tidptr=0x555568ffe650) = 5831
[pid  5831] set_robust_list(0x555568ffe660, 24) = 0
[pid  5831] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   90.856132][ T5830] overlay: filesystem on ./file0 not supported as upperdir
[pid  5831] setpgid(0, 0)               = 0
[pid  5831] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5831] write(3, "1000", 4)         = 4
[pid  5831] close(3executing program
)                    = 0
[pid  5831] write(1, "executing program\n", 18) = 18
[pid  5831] memfd_create("syzkaller", 0) = 3
[pid  5831] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5831] 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  5831] munmap(0x7fbe27600000, 138412032) = 0
[pid  5831] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5831] close(3)                    = 0
[pid  5831] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5831] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5831] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5831] exit_group(0)               = ?
[pid  5831] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5831, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=12 /* 0.12 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 5832 attached
, child_tidptr=0x555568ffe650) = 5832
[pid  5832] set_robust_list(0x555568ffe660, 24) = 0
[pid  5832] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5832] setpgid(0, 0)               = 0
[pid  5832] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5832] write(3, "1000", 4)         = 4
[   91.155961][ T5831] overlay: filesystem on ./file0 not supported as upperdir
[pid  5832] close(3)                    = 0
[pid  5832] write(1, "executing program\n", 18executing program
) = 18
[pid  5832] memfd_create("syzkaller", 0) = 3
[pid  5832] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5832] 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  5832] munmap(0x7fbe27600000, 138412032) = 0
[pid  5832] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5832] close(3)                    = 0
[pid  5832] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5832] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5832] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5832] exit_group(0)               = ?
[pid  5832] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5832, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=14 /* 0.14 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 5833 attached
, child_tidptr=0x555568ffe650) = 5833
[pid  5833] set_robust_list(0x555568ffe660, 24) = 0
[   91.461815][ T5832] overlay: filesystem on ./file0 not supported as upperdir
[pid  5833] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5833] setpgid(0, 0)               = 0
[pid  5833] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5833] write(3, "1000", 4)         = 4
[pid  5833] close(3)                    = 0
executing program
[pid  5833] write(1, "executing program\n", 18) = 18
[pid  5833] memfd_create("syzkaller", 0) = 3
[pid  5833] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5833] 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  5833] munmap(0x7fbe27600000, 138412032) = 0
[pid  5833] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5833] close(3)                    = 0
[pid  5833] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5833] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5833] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5833] exit_group(0)               = ?
[pid  5833] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5833, si_uid=0, si_status=0, si_utime=3 /* 0.03 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 5834 attached
, child_tidptr=0x555568ffe650) = 5834
[pid  5834] set_robust_list(0x555568ffe660, 24) = 0
[pid  5834] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   91.750890][ T5833] overlay: filesystem on ./file0 not supported as upperdir
[pid  5834] setpgid(0, 0)               = 0
[pid  5834] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5834] write(3, "1000", 4)         = 4
[pid  5834] close(3)                    = 0
executing program
[pid  5834] write(1, "executing program\n", 18) = 18
[pid  5834] memfd_create("syzkaller", 0) = 3
[pid  5834] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5834] 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  5834] munmap(0x7fbe27600000, 138412032) = 0
[pid  5834] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5834] close(3)                    = 0
[   92.000791][ T3399] cfg80211: failed to load regulatory.db
[pid  5834] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5834] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5834] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5834] exit_group(0)               = ?
[pid  5834] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5834, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=13 /* 0.13 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 5836 attached
, child_tidptr=0x555568ffe650) = 5836
[   92.089578][ T5834] overlay: filesystem on ./file0 not supported as upperdir
[pid  5836] set_robust_list(0x555568ffe660, 24) = 0
[pid  5836] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5836] setpgid(0, 0)               = 0
[pid  5836] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "1000", 4)         = 4
[pid  5836] close(3)                    = 0
executing program
[pid  5836] write(1, "executing program\n", 18) = 18
[pid  5836] memfd_create("syzkaller", 0) = 3
[pid  5836] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5836] 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  5836] munmap(0x7fbe27600000, 138412032) = 0
[pid  5836] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5836] close(3)                    = 0
[pid  5836] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5836] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5836] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5836] exit_group(0)               = ?
[pid  5836] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5836, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=15 /* 0.15 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 5837 attached
, child_tidptr=0x555568ffe650) = 5837
[pid  5837] set_robust_list(0x555568ffe660, 24) = 0
[pid  5837] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5837] setpgid(0, 0)               = 0
[pid  5837] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "1000", 4)         = 4
[pid  5837] close(3)                    = 0
executing program
[pid  5837] write(1, "executing program\n", 18) = 18
[pid  5837] memfd_create("syzkaller", 0) = 3
[pid  5837] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[   92.438412][ T5836] overlay: filesystem on ./file0 not supported as upperdir
[pid  5837] 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  5837] munmap(0x7fbe27600000, 138412032) = 0
[pid  5837] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5837] close(3)                    = 0
[pid  5837] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5837] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5837] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5837] exit_group(0)               = ?
[pid  5837] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5837, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=12 /* 0.12 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
[   92.721897][ T5837] overlay: filesystem on ./file0 not supported as upperdir
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 5838 attached
, child_tidptr=0x555568ffe650) = 5838
[pid  5838] set_robust_list(0x555568ffe660, 24) = 0
[pid  5838] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5838] setpgid(0, 0)               = 0
[pid  5838] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5838] write(3, "1000", 4)         = 4
[pid  5838] close(3executing program
)                    = 0
[pid  5838] write(1, "executing program\n", 18) = 18
[pid  5838] memfd_create("syzkaller", 0) = 3
[pid  5838] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5838] 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  5838] munmap(0x7fbe27600000, 138412032) = 0
[pid  5838] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5838] close(3)                    = 0
[pid  5838] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5838] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5838] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5838] exit_group(0)               = ?
[pid  5838] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5838, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=13 /* 0.13 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   93.050171][ T5838] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555568ffe650) = 5839
./strace-static-x86_64: Process 5839 attached
[pid  5839] set_robust_list(0x555568ffe660, 24) = 0
[pid  5839] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5839] setpgid(0, 0)               = 0
[pid  5839] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5839] write(3, "1000", 4)         = 4
[pid  5839] close(3)                    = 0
executing program
[pid  5839] write(1, "executing program\n", 18) = 18
[pid  5839] memfd_create("syzkaller", 0) = 3
[pid  5839] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5839] 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  5839] munmap(0x7fbe27600000, 138412032) = 0
[pid  5839] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5839] close(3)                    = 0
[pid  5839] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5839] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5839] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5839] exit_group(0)               = ?
[pid  5839] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5839, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, 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)
[   93.358749][ T5839] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5840 attached
, child_tidptr=0x555568ffe650) = 5840
[pid  5840] set_robust_list(0x555568ffe660, 24) = 0
[pid  5840] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5840] setpgid(0, 0)               = 0
[pid  5840] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5840] write(3, "1000", 4)         = 4
[pid  5840] close(3)                    = 0
executing program
[pid  5840] write(1, "executing program\n", 18) = 18
[pid  5840] memfd_create("syzkaller", 0) = 3
[pid  5840] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5840] 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  5840] munmap(0x7fbe27600000, 138412032) = 0
[pid  5840] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5840] close(3)                    = 0
[pid  5840] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5840] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5840] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5840] exit_group(0)               = ?
[pid  5840] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5840, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=13 /* 0.13 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   93.674106][ T5840] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555568ffe650) = 5841
./strace-static-x86_64: Process 5841 attached
[pid  5841] set_robust_list(0x555568ffe660, 24) = 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) = 0x7fbe27600000
[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(0x7fbe27600000, 138412032) = 0
[pid  5841] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5841] close(3)                    = 0
[pid  5841] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5841] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5841] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=3 /* 0.03 s */, si_stime=12 /* 0.12 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 5842 attached
, child_tidptr=0x555568ffe650) = 5842
[   94.047812][ T5841] overlay: filesystem on ./file0 not supported as upperdir
[pid  5842] set_robust_list(0x555568ffe660, 24) = 0
[pid  5842] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5842] setpgid(0, 0)               = 0
[pid  5842] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5842] write(3, "1000", 4)         = 4
[pid  5842] close(3executing program
)                    = 0
[pid  5842] write(1, "executing program\n", 18) = 18
[pid  5842] memfd_create("syzkaller", 0) = 3
[pid  5842] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5842] 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  5842] munmap(0x7fbe27600000, 138412032) = 0
[pid  5842] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5842] close(3)                    = 0
[pid  5842] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5842] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5842] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5842] exit_group(0)               = ?
[pid  5842] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5842, si_uid=0, si_status=0, si_utime=5 /* 0.05 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 5843 attached
, child_tidptr=0x555568ffe650) = 5843
[pid  5843] set_robust_list(0x555568ffe660, 24) = 0
[pid  5843] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5843] setpgid(0, 0)               = 0
[pid  5843] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5843] write(3, "1000", 4)         = 4
[pid  5843] close(3executing program
)                    = 0
[pid  5843] write(1, "executing program\n", 18) = 18
[pid  5843] memfd_create("syzkaller", 0) = 3
[   94.352038][ T5842] overlay: filesystem on ./file0 not supported as upperdir
[pid  5843] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5843] 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  5843] munmap(0x7fbe27600000, 138412032) = 0
[pid  5843] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5843] close(3)                    = 0
[pid  5843] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5843] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5843] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5843] exit_group(0)               = ?
[pid  5843] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5843, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, 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 5844 attached
, child_tidptr=0x555568ffe650) = 5844
[   94.603394][ T5843] overlay: filesystem on ./file0 not supported as upperdir
[pid  5844] set_robust_list(0x555568ffe660, 24) = 0
[pid  5844] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5844] setpgid(0, 0)               = 0
[pid  5844] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5844] write(3, "1000", 4)         = 4
[pid  5844] close(3)                    = 0
executing program
[pid  5844] write(1, "executing program\n", 18) = 18
[pid  5844] memfd_create("syzkaller", 0) = 3
[pid  5844] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[pid  5844] 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  5844] munmap(0x7fbe27600000, 138412032) = 0
[pid  5844] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5844] close(3)                    = 0
[pid  5844] mkdirat(AT_FDCWD, "./file0", 0700) = -1 EEXIST (File exists)
[pid  5844] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5844] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./bus,,") = -1 EINVAL (Invalid argument)
[pid  5844] exit_group(0)               = ?
[pid  5844] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5844, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=14 /* 0.14 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   94.939961][ T5844] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5845 attached
, child_tidptr=0x555568ffe650) = 5845
[pid  5845] set_robust_list(0x555568ffe660, 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
[pid  5845] write(1, "executing program\n", 18executing program
) = 18
[pid  5845] memfd_create("syzkaller", 0) = 3
[pid  5845] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5845] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5845] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=14 /* 0.14 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 5847 attached
, child_tidptr=0x555568ffe650) = 5847
[   95.259358][ T5845] overlay: filesystem on ./file0 not supported as upperdir
[pid  5847] set_robust_list(0x555568ffe660, 24) = 0
[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) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5847] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5847] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=12 /* 0.12 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   95.550718][ T5847] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555568ffe650) = 5848
./strace-static-x86_64: Process 5848 attached
[pid  5848] set_robust_list(0x555568ffe660, 24) = 0
[pid  5848] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5848] setpgid(0, 0)               = 0
[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(3executing program
)                    = 0
[pid  5848] write(1, "executing program\n", 18) = 18
[pid  5848] memfd_create("syzkaller", 0) = 3
[pid  5848] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5848] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5848] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=4 /* 0.04 s */, si_stime=11 /* 0.11 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   95.930301][ T5848] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5849 attached
, child_tidptr=0x555568ffe650) = 5849
[pid  5849] set_robust_list(0x555568ffe660, 24) = 0
[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
executing program
[pid  5849] write(1, "executing program\n", 18) = 18
[pid  5849] memfd_create("syzkaller", 0) = 3
[pid  5849] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5849] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5849] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=1 /* 0.01 s */, si_stime=16 /* 0.16 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   96.251368][ T5849] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5850 attached
, child_tidptr=0x555568ffe650) = 5850
[pid  5850] set_robust_list(0x555568ffe660, 24) = 0
[pid  5850] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[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
executing program
[pid  5850] write(1, "executing program\n", 18) = 18
[pid  5850] memfd_create("syzkaller", 0) = 3
[pid  5850] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5850] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5850] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=3 /* 0.03 s */, si_stime=12 /* 0.12 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 5851 attached
, child_tidptr=0x555568ffe650) = 5851
[   96.553485][ T5850] overlay: filesystem on ./file0 not supported as upperdir
[pid  5851] set_robust_list(0x555568ffe660, 24) = 0
[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
executing program
[pid  5851] write(1, "executing program\n", 18) = 18
[pid  5851] memfd_create("syzkaller", 0) = 3
[pid  5851] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5851] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5851] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=4 /* 0.04 s */, si_stime=12 /* 0.12 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 5852 attached
, child_tidptr=0x555568ffe650) = 5852
[   96.864564][ T5851] overlay: filesystem on ./file0 not supported as upperdir
[pid  5852] set_robust_list(0x555568ffe660, 24) = 0
[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
executing program
[pid  5852] write(1, "executing program\n", 18) = 18
[pid  5852] memfd_create("syzkaller", 0) = 3
[pid  5852] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5852] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5852] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=4 /* 0.04 s */, si_stime=11 /* 0.11 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   97.196234][ T5852] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5853 attached
, child_tidptr=0x555568ffe650) = 5853
[pid  5853] set_robust_list(0x555568ffe660, 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
executing program
[pid  5853] write(1, "executing program\n", 18) = 18
[pid  5853] memfd_create("syzkaller", 0) = 3
[pid  5853] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5853] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5853] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=2 /* 0.02 s */, si_stime=13 /* 0.13 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   97.507144][ T5853] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5854 attached
, child_tidptr=0x555568ffe650) = 5854
[pid  5854] set_robust_list(0x555568ffe660, 24) = 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
[pid  5854] close(3)                    = 0
[pid  5854] write(1, "executing program\n", 18executing program
) = 18
[pid  5854] memfd_create("syzkaller", 0) = 3
[pid  5854] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5854] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5854] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=3 /* 0.03 s */, si_stime=13 /* 0.13 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   97.877486][ T5854] overlay: filesystem on ./file0 not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5855 attached
, child_tidptr=0x555568ffe650) = 5855
[pid  5855] set_robust_list(0x555568ffe660, 24) = 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) = 0x7fbe27600000
[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(0x7fbe27600000, 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", 0700) = -1 EEXIST (File exists)
[pid  5855] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5855] mount(NULL, "./file0", "overlay", MS_POSIXACL, "workdir=./file0,lowerdir=.,upperdir=./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=3 /* 0.03 s */, si_stime=14 /* 0.14 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 5856 attached
 <unfinished ...>
[pid  5856] set_robust_list(0x555568ffe660, 24) = 0
[   98.149191][ T5855] overlay: filesystem on ./file0 not supported as upperdir
[pid  5856] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5821] <... clone resumed>, child_tidptr=0x555568ffe650) = 5856
[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) = 0x7fbe27600000