./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2987835185 <...> Warning: Permanently added '10.128.0.179' (ED25519) to the list of known hosts. execve("./syz-executor2987835185", ["./syz-executor2987835185"], 0x7ffcdde7b7f0 /* 10 vars */) = 0 brk(NULL) = 0x555555808000 brk(0x555555808d00) = 0x555555808d00 arch_prctl(ARCH_SET_FS, 0x555555808380) = 0 set_tid_address(0x555555808650) = 5016 set_robust_list(0x555555808660, 24) = 0 rseq(0x555555808ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2987835185", 4096) = 28 getrandom("\x98\x9b\xb9\x25\x61\x0f\x7a\x8d", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555555808d00 brk(0x555555829d00) = 0x555555829d00 brk(0x55555582a000) = 0x55555582a000 mprotect(0x7f8a2aab6000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 [ 71.140746][ T26] audit: type=1400 audit(1690597806.140:83): avc: denied { write } for pid=5013 comm="strace-static-x" path="pipe:[30405]" dev="pipefs" ino=30405 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 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, child_tidptr=0x555555808650) = 5017 ./strace-static-x86_64: Process 5017 attached [pid 5017] set_robust_list(0x555555808660, 24) = 0 [pid 5017] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5017] setpgid(0, 0) = 0 [pid 5017] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5017] write(3, "1000", 4) = 4 [pid 5017] close(3) = 0 [ 71.172784][ T26] audit: type=1400 audit(1690597806.170:84): avc: denied { execmem } for pid=5016 comm="syz-executor298" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 71.192931][ T26] audit: type=1400 audit(1690597806.170:85): avc: denied { read write } for pid=5016 comm="syz-executor298" name="loop0" dev="devtmpfs" ino=648 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [pid 5017] memfd_create("syzkaller", 0) = 3 [pid 5017] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 71.219173][ T26] audit: type=1400 audit(1690597806.170:86): avc: denied { open } for pid=5016 comm="syz-executor298" path="/dev/loop0" dev="devtmpfs" ino=648 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 71.230201][ T5017] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5017 'syz-executor298' [ 71.244294][ T26] audit: type=1400 audit(1690597806.170:87): avc: denied { ioctl } for pid=5016 comm="syz-executor298" path="/dev/loop0" dev="devtmpfs" ino=648 ioctlcmd=0x4c01 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [pid 5017] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5017] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5017] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5017] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5017] close(3) = 0 [pid 5017] mkdir("./file0", 0777) = 0 [ 71.496823][ T5017] loop0: detected capacity change from 0 to 40427 [ 71.507706][ T26] audit: type=1400 audit(1690597806.500:88): avc: denied { mounton } for pid=5017 comm="syz-executor298" path="/root/file0" dev="sda1" ino=1927 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [ 71.519559][ T5017] F2FS-fs (loop0): Found nat_bits in checkpoint [pid 5017] mount("/dev/loop0", "./file0", "f2fs", 0, "nolazytime,data_flush,noinline_xattr,jqfmt=vfsv1,") = 0 [pid 5017] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5017] chdir("./file0") = 0 [pid 5017] ioctl(4, LOOP_CLR_FD) = 0 [pid 5017] close(4) = 0 [pid 5017] mkdir("./file1", 000) = 0 [pid 5017] mkdirat(AT_FDCWD, "./file0", 000) = 0 [pid 5017] mkdirat(AT_FDCWD, "./bus", 000) = 0 [ 71.572236][ T5017] F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5 [ 71.581175][ T26] audit: type=1400 audit(1690597806.580:89): avc: denied { mount } for pid=5017 comm="syz-executor298" name="/" dev="loop0" ino=3 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fs_t tclass=filesystem permissive=1 [ 71.603371][ T26] audit: type=1400 audit(1690597806.580:90): avc: denied { write } for pid=5017 comm="syz-executor298" name="/" dev="loop0" ino=3 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1 [ 71.615540][ T5017] [ 71.626988][ T26] audit: type=1400 audit(1690597806.580:91): avc: denied { add_name } for pid=5017 comm="syz-executor298" name="file1" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1 [ 71.627637][ T5017] ====================================================== [ 71.627646][ T5017] WARNING: possible circular locking dependency detected [ 71.652415][ T26] audit: type=1400 audit(1690597806.600:92): avc: denied { create } for pid=5017 comm="syz-executor298" name="file1" scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:unlabeled_t tclass=dir permissive=1 [ 71.655571][ T5017] 6.5.0-rc3-syzkaller-00225-gf837f0a3c948 #0 Not tainted [ 71.655585][ T5017] ------------------------------------------------------ [ 71.655593][ T5017] syz-executor298/5017 is trying to acquire lock: [ 71.703483][ T5017] ffff8880737bf6e8 (&fi->i_sem){+.+.}-{3:3}, at: f2fs_add_inline_entry+0x300/0x6f0 [ 71.712843][ T5017] [ 71.712843][ T5017] but task is already holding lock: [ 71.720221][ T5017] ffff8880737bb8c8 (&fi->i_xattr_sem){.+.+}-{3:3}, at: f2fs_add_dentry+0x92/0x230 [ 71.729496][ T5017] [ 71.729496][ T5017] which lock already depends on the new lock. [ 71.729496][ T5017] [ 71.739932][ T5017] [ 71.739932][ T5017] the existing dependency chain (in reverse order) is: [ 71.748944][ T5017] [ 71.748944][ T5017] -> #1 (&fi->i_xattr_sem){.+.+}-{3:3}: [ 71.756681][ T5017] down_read+0x9c/0x470 [ 71.761379][ T5017] f2fs_getxattr+0xb1e/0x12c0 [ 71.766588][ T5017] __f2fs_get_acl+0x5a/0x900 [ 71.771709][ T5017] f2fs_init_acl+0x15c/0xb30 [ 71.776826][ T5017] f2fs_init_inode_metadata+0x159/0x1290 [ 71.783005][ T5017] f2fs_add_regular_entry+0x79e/0xb90 [ 71.788945][ T5017] f2fs_add_dentry+0x1de/0x230 [ 71.794281][ T5017] f2fs_do_add_link+0x190/0x280 [ 71.799687][ T5017] f2fs_mkdir+0x377/0x620 [ 71.804549][ T5017] vfs_mkdir+0x532/0x7e0 [ 71.809324][ T5017] do_mkdirat+0x2a9/0x330 [ 71.814187][ T5017] __x64_sys_mkdir+0xf2/0x140 [ 71.819399][ T5017] do_syscall_64+0x38/0xb0 [ 71.824337][ T5017] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 71.830758][ T5017] [ 71.830758][ T5017] -> #0 (&fi->i_sem){+.+.}-{3:3}: [ 71.837988][ T5017] __lock_acquire+0x2e3d/0x5de0 [ 71.843371][ T5017] lock_acquire+0x1ae/0x510 [ 71.848400][ T5017] down_write+0x93/0x200 [ 71.853174][ T5017] f2fs_add_inline_entry+0x300/0x6f0 [ 71.858995][ T5017] f2fs_add_dentry+0xa6/0x230 [ 71.864226][ T5017] f2fs_do_add_link+0x190/0x280 [ 71.869611][ T5017] f2fs_mkdir+0x377/0x620 [ 71.874471][ T5017] vfs_mkdir+0x532/0x7e0 [ 71.879246][ T5017] ovl_mkdir_real+0xb5/0x370 [ 71.884391][ T5017] ovl_workdir_create+0x3de/0x820 [ 71.889960][ T5017] ovl_fill_super+0xdab/0x6180 [ 71.895255][ T5017] vfs_get_super+0xf9/0x290 [ 71.900335][ T5017] vfs_get_tree+0x88/0x350 [ 71.905309][ T5017] path_mount+0x1492/0x1ed0 [ 71.910376][ T5017] __x64_sys_mount+0x293/0x310 [ 71.915722][ T5017] do_syscall_64+0x38/0xb0 [ 71.920658][ T5017] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 71.927077][ T5017] [ 71.927077][ T5017] other info that might help us debug this: [ 71.927077][ T5017] [ 71.937300][ T5017] Possible unsafe locking scenario: [ 71.937300][ T5017] [ 71.944750][ T5017] CPU0 CPU1 [ 71.950105][ T5017] ---- ---- [ 71.955484][ T5017] rlock(&fi->i_xattr_sem); [ 71.960080][ T5017] lock(&fi->i_sem); [ 71.966587][ T5017] lock(&fi->i_xattr_sem); [ 71.973630][ T5017] lock(&fi->i_sem); [ 71.977609][ T5017] [ 71.977609][ T5017] *** DEADLOCK *** [ 71.977609][ T5017] [ 71.985746][ T5017] 5 locks held by syz-executor298/5017: [ 71.991331][ T5017] #0: ffff888018f6e0e0 (&type->s_umount_key#58/1){+.+.}-{3:3}, at: alloc_super+0x22e/0xb40 [ 72.001483][ T5017] #1: ffff888023a66410 (sb_writers#10){.+.+}-{0:0}, at: ovl_fill_super+0xd7c/0x6180 [ 72.011006][ T5017] #2: ffff8880737bb250 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: ovl_workdir_create+0x13e/0x820 [ 72.021904][ T5017] #3: ffff888073a4c3b0 (&sbi->cp_rwsem){.+.+}-{3:3}, at: f2fs_mkdir+0x293/0x620 [ 72.031082][ T5017] #4: ffff8880737bb8c8 (&fi->i_xattr_sem){.+.+}-{3:3}, at: f2fs_add_dentry+0x92/0x230 [ 72.040751][ T5017] [ 72.040751][ T5017] stack backtrace: [ 72.046636][ T5017] CPU: 1 PID: 5017 Comm: syz-executor298 Not tainted 6.5.0-rc3-syzkaller-00225-gf837f0a3c948 #0 [ 72.057055][ T5017] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 72.067106][ T5017] Call Trace: [ 72.070385][ T5017] [ 72.073333][ T5017] dump_stack_lvl+0xd9/0x1b0 [ 72.077941][ T5017] check_noncircular+0x311/0x3f0 [ 72.082899][ T5017] ? print_circular_bug+0x750/0x750 [ 72.088134][ T5017] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 72.094136][ T5017] __lock_acquire+0x2e3d/0x5de0 [ 72.099025][ T5017] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 72.105055][ T5017] lock_acquire+0x1ae/0x510 [ 72.109566][ T5017] ? f2fs_add_inline_entry+0x300/0x6f0 [ 72.115048][ T5017] ? lock_sync+0x190/0x190 [ 72.119471][ T5017] ? __filemap_get_folio+0x1e7/0x990 [ 72.124766][ T5017] ? preempt_count_sub+0x150/0x150 [ 72.129889][ T5017] down_write+0x93/0x200 [ 72.134154][ T5017] ? f2fs_add_inline_entry+0x300/0x6f0 [ 72.139641][ T5017] ? down_write_killable_nested+0x250/0x250 [ 72.145541][ T5017] ? f2fs_room_for_filename+0xa6/0xc0 [ 72.150920][ T5017] f2fs_add_inline_entry+0x300/0x6f0 [ 72.156211][ T5017] ? f2fs_try_convert_inline_dir+0x3d0/0x3d0 [ 72.162203][ T5017] f2fs_add_dentry+0xa6/0x230 [ 72.166901][ T5017] f2fs_do_add_link+0x190/0x280 [ 72.171756][ T5017] ? f2fs_add_dentry+0x230/0x230 [ 72.176698][ T5017] ? f2fs_mkdir+0x11e/0x620 [ 72.181208][ T5017] ? f2fs_dquot_initialize+0x117/0x2f0 [ 72.186684][ T5017] f2fs_mkdir+0x377/0x620 [ 72.191028][ T5017] ? security_inode_mkdir+0xdd/0x110 [ 72.196335][ T5017] vfs_mkdir+0x532/0x7e0 [ 72.200605][ T5017] ovl_mkdir_real+0xb5/0x370 [ 72.205242][ T5017] ovl_workdir_create+0x3de/0x820 [ 72.210273][ T5017] ? ovl_do_rename.constprop.0+0x270/0x270 [ 72.216105][ T5017] ? lock_sync+0x190/0x190 [ 72.220529][ T5017] ? __mnt_want_write+0x217/0x300 [ 72.225563][ T5017] ovl_fill_super+0xdab/0x6180 [ 72.230346][ T5017] ? ovl_check_layer.part.0+0x1b0/0x1b0 [ 72.235898][ T5017] ? reacquire_held_locks+0x4b0/0x4b0 [ 72.241279][ T5017] ? down_write+0x14f/0x200 [ 72.245829][ T5017] ? down_write_killable_nested+0x250/0x250 [ 72.251731][ T5017] ? up_write+0x1b3/0x510 [ 72.256064][ T5017] ? sget_fc+0x65f/0x860 [ 72.260327][ T5017] ? vfs_get_super+0xf9/0x290 [ 72.265030][ T5017] vfs_get_super+0xf9/0x290 [ 72.269560][ T5017] ? ovl_check_layer.part.0+0x1b0/0x1b0 [ 72.275114][ T5017] vfs_get_tree+0x88/0x350 [ 72.279538][ T5017] path_mount+0x1492/0x1ed0 [ 72.284047][ T5017] ? lockdep_hardirqs_on+0x7d/0x100 [ 72.289257][ T5017] ? finish_automount+0xa50/0xa50 [ 72.294329][ T5017] ? rep_movs_alternative+0x4a/0xb0 [ 72.299546][ T5017] ? putname+0x101/0x140 [ 72.303840][ T5017] __x64_sys_mount+0x293/0x310 [ 72.308671][ T5017] ? copy_mnt_ns+0xb60/0xb60 [ 72.313288][ T5017] ? lockdep_hardirqs_on+0x7d/0x100 [ 72.318493][ T5017] ? _raw_spin_unlock_irq+0x2e/0x50 [ 72.323735][ T5017] ? ptrace_notify+0xf4/0x130 [ 72.328419][ T5017] do_syscall_64+0x38/0xb0 [ 72.332840][ T5017] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 72.338735][ T5017] RIP: 0033:0x7f8a2aa3db59 [ 72.343155][ T5017] 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 [ 72.362768][ T5017] RSP: 002b:00007fffa11eaa38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [pid 5017] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = 0 [pid 5017] exit_group(0) = ? [pid 5017] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5017, si_uid=0, si_status=0, si_utime=7 /* 0.07 s */, si_stime=27 /* 0.27 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5023 ./strace-static-x86_64: Process 5023 attached [pid 5023] set_robust_list(0x555555808660, 24) = 0 [pid 5023] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5023] setpgid(0, 0) = 0 [pid 5023] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5023] write(3, "1000", 4) = 4 [pid 5023] close(3) = 0 [pid 5023] memfd_create("syzkaller", 0) = 3 [pid 5023] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 72.371186][ T5017] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f8a2aa3db59 [ 72.379160][ T5017] RDX: 0000000020000280 RSI: 0000000020000040 RDI: 0000000000000000 [ 72.387153][ T5017] RBP: 00007f8a2aab65f0 R08: 0000000020000180 R09: 00005555558094c0 [ 72.395143][ T5017] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa11eaa60 [ 72.403118][ T5017] R13: 00007fffa11eac88 R14: 431bde82d7b634db R15: 00007f8a2aa8603b [ 72.411105][ T5017] [pid 5023] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5023] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5023] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5023] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5023] ioctl(4, LOOP_CLR_FD) = 0 [pid 5023] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5023] close(4) = 0 [pid 5023] close(3) = 0 [pid 5023] mkdir("./file1", 000) = 0 [pid 5023] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5023] mkdirat(AT_FDCWD, "./bus", 000) = 0 [pid 5023] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = 0 [pid 5023] exit_group(0) = ? [pid 5023] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5023, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=19 /* 0.19 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5024 ./strace-static-x86_64: Process 5024 attached [pid 5024] set_robust_list(0x555555808660, 24) = 0 [pid 5024] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5024] setpgid(0, 0) = 0 [pid 5024] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5024] write(3, "1000", 4) = 4 [pid 5024] close(3) = 0 [pid 5024] memfd_create("syzkaller", 0) = 3 [pid 5024] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [pid 5024] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5024] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5024] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5024] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5024] ioctl(4, LOOP_CLR_FD) = 0 [pid 5024] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5024] close(4) = 0 [pid 5024] close(3) = 0 [pid 5024] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5024] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5024] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5024] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5024] exit_group(0) = ? [pid 5024] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5024, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=19 /* 0.19 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5025 ./strace-static-x86_64: Process 5025 attached [pid 5025] set_robust_list(0x555555808660, 24) = 0 [pid 5025] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5025] setpgid(0, 0) = 0 [pid 5025] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5025] write(3, "1000", 4) = 4 [pid 5025] close(3) = 0 [pid 5025] memfd_create("syzkaller", 0) = 3 [pid 5025] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 72.928530][ T5024] overlayfs: filesystem on './bus' not supported as upperdir [pid 5025] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5025] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5025] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5025] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5025] ioctl(4, LOOP_CLR_FD) = 0 [pid 5025] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5025] close(4) = 0 [pid 5025] close(3) = 0 [pid 5025] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5025] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5025] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5025] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5025] exit_group(0) = ? [pid 5025] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5025, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=18 /* 0.18 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5026 ./strace-static-x86_64: Process 5026 attached [pid 5026] set_robust_list(0x555555808660, 24) = 0 [pid 5026] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5026] setpgid(0, 0) = 0 [pid 5026] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5026] write(3, "1000", 4) = 4 [pid 5026] close(3) = 0 [pid 5026] memfd_create("syzkaller", 0) = 3 [pid 5026] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 73.187268][ T5025] overlayfs: filesystem on './bus' not supported as upperdir [pid 5026] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5026] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5026] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5026] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5026] ioctl(4, LOOP_CLR_FD) = 0 [pid 5026] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5026] close(4) = 0 [pid 5026] close(3) = 0 [pid 5026] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5026] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5026] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5026] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5026] exit_group(0) = ? [pid 5026] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5026, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5027 ./strace-static-x86_64: Process 5027 attached [pid 5027] set_robust_list(0x555555808660, 24) = 0 [pid 5027] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5027] setpgid(0, 0) = 0 [pid 5027] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5027] write(3, "1000", 4) = 4 [pid 5027] close(3) = 0 [pid 5027] memfd_create("syzkaller", 0) = 3 [pid 5027] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 73.447952][ T5026] overlayfs: filesystem on './bus' not supported as upperdir [pid 5027] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5027] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5027] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5027] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5027] ioctl(4, LOOP_CLR_FD) = 0 [pid 5027] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5027] close(4) = 0 [pid 5027] close(3) = 0 [pid 5027] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5027] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5027] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5027] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5027] exit_group(0) = ? [pid 5027] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5027, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=19 /* 0.19 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5028 ./strace-static-x86_64: Process 5028 attached [pid 5028] set_robust_list(0x555555808660, 24) = 0 [pid 5028] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5028] setpgid(0, 0) = 0 [pid 5028] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5028] write(3, "1000", 4) = 4 [pid 5028] close(3) = 0 [pid 5028] memfd_create("syzkaller", 0) = 3 [pid 5028] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 73.706599][ T5027] overlayfs: filesystem on './bus' not supported as upperdir [pid 5028] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5028] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5028] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5028] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5028] ioctl(4, LOOP_CLR_FD) = 0 [pid 5028] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5028] close(4) = 0 [pid 5028] close(3) = 0 [pid 5028] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5028] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5028] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5028] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5028] exit_group(0) = ? [pid 5028] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5028, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=18 /* 0.18 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5029 ./strace-static-x86_64: Process 5029 attached [pid 5029] set_robust_list(0x555555808660, 24) = 0 [pid 5029] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5029] setpgid(0, 0) = 0 [pid 5029] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5029] write(3, "1000", 4) = 4 [pid 5029] close(3) = 0 [pid 5029] memfd_create("syzkaller", 0) = 3 [pid 5029] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 74.001508][ T5028] overlayfs: filesystem on './bus' not supported as upperdir [pid 5029] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5029] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5029] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5029] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5029] ioctl(4, LOOP_CLR_FD) = 0 [pid 5029] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5029] close(4) = 0 [pid 5029] close(3) = 0 [pid 5029] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5029] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5029] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5029] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5029] exit_group(0) = ? [pid 5029] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5029, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=15 /* 0.15 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5030 ./strace-static-x86_64: Process 5030 attached [pid 5030] set_robust_list(0x555555808660, 24) = 0 [pid 5030] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5030] setpgid(0, 0) = 0 [pid 5030] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5030] write(3, "1000", 4) = 4 [pid 5030] close(3) = 0 [pid 5030] memfd_create("syzkaller", 0) = 3 [pid 5030] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 74.264854][ T5029] overlayfs: filesystem on './bus' not supported as upperdir [pid 5030] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5030] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5030] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5030] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5030] ioctl(4, LOOP_CLR_FD) = 0 [pid 5030] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5030] close(4) = 0 [pid 5030] close(3) = 0 [pid 5030] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5030] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5030] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5030] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5030] exit_group(0) = ? [pid 5030] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5030, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=21 /* 0.21 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5031 ./strace-static-x86_64: Process 5031 attached [pid 5031] set_robust_list(0x555555808660, 24) = 0 [pid 5031] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5031] setpgid(0, 0) = 0 [pid 5031] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5031] write(3, "1000", 4) = 4 [pid 5031] close(3) = 0 [pid 5031] memfd_create("syzkaller", 0) = 3 [pid 5031] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 74.544504][ T5030] overlayfs: filesystem on './bus' not supported as upperdir [pid 5031] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5031] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5031] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5031] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5031] ioctl(4, LOOP_CLR_FD) = 0 [pid 5031] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5031] close(4) = 0 [pid 5031] close(3) = 0 [pid 5031] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5031] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5031] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5031] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5031] exit_group(0) = ? [pid 5031] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5031, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5032 ./strace-static-x86_64: Process 5032 attached [pid 5032] set_robust_list(0x555555808660, 24) = 0 [pid 5032] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5032] setpgid(0, 0) = 0 [pid 5032] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5032] write(3, "1000", 4) = 4 [pid 5032] close(3) = 0 [pid 5032] memfd_create("syzkaller", 0) = 3 [pid 5032] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 74.811368][ T5031] overlayfs: filesystem on './bus' not supported as upperdir [pid 5032] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5032] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5032] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5032] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5032] ioctl(4, LOOP_CLR_FD) = 0 [pid 5032] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5032] close(4) = 0 [pid 5032] close(3) = 0 [pid 5032] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5032] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5032] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5032] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5032] exit_group(0) = ? [pid 5032] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5032, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=16 /* 0.16 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5033 ./strace-static-x86_64: Process 5033 attached [pid 5033] set_robust_list(0x555555808660, 24) = 0 [pid 5033] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5033] setpgid(0, 0) = 0 [pid 5033] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5033] write(3, "1000", 4) = 4 [pid 5033] close(3) = 0 [pid 5033] memfd_create("syzkaller", 0) = 3 [pid 5033] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 75.067594][ T5032] overlayfs: filesystem on './bus' not supported as upperdir [pid 5033] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5033] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5033] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5033] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5033] ioctl(4, LOOP_CLR_FD) = 0 [pid 5033] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5033] close(4) = 0 [pid 5033] close(3) = 0 [pid 5033] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5033] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5033] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5033] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5033] exit_group(0) = ? [pid 5033] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5033, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=18 /* 0.18 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5034 ./strace-static-x86_64: Process 5034 attached [pid 5034] set_robust_list(0x555555808660, 24) = 0 [pid 5034] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5034] setpgid(0, 0) = 0 [pid 5034] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5034] write(3, "1000", 4) = 4 [pid 5034] close(3) = 0 [pid 5034] memfd_create("syzkaller", 0) = 3 [pid 5034] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 75.309372][ T5033] overlayfs: filesystem on './bus' not supported as upperdir [pid 5034] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5034] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5034] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5034] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5034] ioctl(4, LOOP_CLR_FD) = 0 [pid 5034] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5034] close(4) = 0 [pid 5034] close(3) = 0 [pid 5034] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5034] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5034] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5034] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5034] exit_group(0) = ? [pid 5034] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5034, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=14 /* 0.14 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5035 ./strace-static-x86_64: Process 5035 attached [pid 5035] set_robust_list(0x555555808660, 24) = 0 [pid 5035] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5035] setpgid(0, 0) = 0 [pid 5035] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5035] write(3, "1000", 4) = 4 [pid 5035] close(3) = 0 [pid 5035] memfd_create("syzkaller", 0) = 3 [pid 5035] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 75.561279][ T5034] overlayfs: filesystem on './bus' not supported as upperdir [pid 5035] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5035] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5035] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5035] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5035] ioctl(4, LOOP_CLR_FD) = 0 [pid 5035] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5035] close(4) = 0 [pid 5035] close(3) = 0 [pid 5035] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5035] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5035] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5035] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5035] exit_group(0) = ? [pid 5035] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5035, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=16 /* 0.16 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5036 ./strace-static-x86_64: Process 5036 attached [pid 5036] set_robust_list(0x555555808660, 24) = 0 [pid 5036] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5036] setpgid(0, 0) = 0 [pid 5036] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5036] write(3, "1000", 4) = 4 [pid 5036] close(3) = 0 [pid 5036] memfd_create("syzkaller", 0) = 3 [pid 5036] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 75.811138][ T5035] overlayfs: filesystem on './bus' not supported as upperdir [pid 5036] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5036] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5036] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5036] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5036] ioctl(4, LOOP_CLR_FD) = 0 [pid 5036] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5036] close(4) = 0 [pid 5036] close(3) = 0 [pid 5036] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5036] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5036] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5036] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5036] exit_group(0) = ? [pid 5036] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5036, si_uid=0, si_status=0, si_utime=6 /* 0.06 s */, si_stime=16 /* 0.16 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5037 ./strace-static-x86_64: Process 5037 attached [pid 5037] set_robust_list(0x555555808660, 24) = 0 [pid 5037] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5037] setpgid(0, 0) = 0 [pid 5037] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5037] write(3, "1000", 4) = 4 [pid 5037] close(3) = 0 [pid 5037] memfd_create("syzkaller", 0) = 3 [pid 5037] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 76.065056][ T5036] overlayfs: filesystem on './bus' not supported as upperdir [pid 5037] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5037] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5037] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5037] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5037] ioctl(4, LOOP_CLR_FD) = 0 [pid 5037] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5037] close(4) = 0 [pid 5037] close(3) = 0 [pid 5037] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5037] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5037] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5037] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5037] exit_group(0) = ? [pid 5037] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5037, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5038 ./strace-static-x86_64: Process 5038 attached [pid 5038] set_robust_list(0x555555808660, 24) = 0 [pid 5038] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5038] setpgid(0, 0) = 0 [pid 5038] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5038] write(3, "1000", 4) = 4 [pid 5038] close(3) = 0 [pid 5038] memfd_create("syzkaller", 0) = 3 [pid 5038] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 76.326869][ T5037] overlayfs: filesystem on './bus' not supported as upperdir [pid 5038] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5038] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5038] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5038] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5038] ioctl(4, LOOP_CLR_FD) = 0 [pid 5038] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5038] close(4) = 0 [pid 5038] close(3) = 0 [pid 5038] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5038] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5038] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5038] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5038] exit_group(0) = ? [pid 5038] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5038, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=14 /* 0.14 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5039 ./strace-static-x86_64: Process 5039 attached [pid 5039] set_robust_list(0x555555808660, 24) = 0 [pid 5039] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5039] setpgid(0, 0) = 0 [pid 5039] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5039] write(3, "1000", 4) = 4 [pid 5039] close(3) = 0 [pid 5039] memfd_create("syzkaller", 0) = 3 [pid 5039] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 76.595714][ T5038] overlayfs: filesystem on './bus' not supported as upperdir [pid 5039] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5039] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5039] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5039] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5039] ioctl(4, LOOP_CLR_FD) = 0 [pid 5039] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5039] close(4) = 0 [pid 5039] close(3) = 0 [pid 5039] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5039] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5039] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5039] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5039] exit_group(0) = ? [pid 5039] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5039, si_uid=0, si_status=0, si_utime=6 /* 0.06 s */, si_stime=16 /* 0.16 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5040 ./strace-static-x86_64: Process 5040 attached [pid 5040] set_robust_list(0x555555808660, 24) = 0 [pid 5040] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5040] setpgid(0, 0) = 0 [pid 5040] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5040] write(3, "1000", 4) = 4 [pid 5040] close(3) = 0 [pid 5040] memfd_create("syzkaller", 0) = 3 [pid 5040] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 76.865844][ T5039] overlayfs: filesystem on './bus' not supported as upperdir [pid 5040] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5040] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5040] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5040] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5040] ioctl(4, LOOP_CLR_FD) = 0 [pid 5040] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5040] close(4) = 0 [pid 5040] close(3) = 0 [pid 5040] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5040] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5040] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5040] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5040] exit_group(0) = ? [pid 5040] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5040, si_uid=0, si_status=0, si_utime=6 /* 0.06 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5041 ./strace-static-x86_64: Process 5041 attached [pid 5041] set_robust_list(0x555555808660, 24) = 0 [pid 5041] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5041] setpgid(0, 0) = 0 [pid 5041] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5041] write(3, "1000", 4) = 4 [pid 5041] close(3) = 0 [pid 5041] memfd_create("syzkaller", 0) = 3 [pid 5041] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 77.131253][ T5040] overlayfs: filesystem on './bus' not supported as upperdir [pid 5041] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5041] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5041] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5041] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5041] ioctl(4, LOOP_CLR_FD) = 0 [pid 5041] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5041] close(4) = 0 [pid 5041] close(3) = 0 [pid 5041] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5041] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5041] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5041] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5041] exit_group(0) = ? [pid 5041] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5041, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=18 /* 0.18 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5042 ./strace-static-x86_64: Process 5042 attached [pid 5042] set_robust_list(0x555555808660, 24) = 0 [pid 5042] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5042] setpgid(0, 0) = 0 [pid 5042] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5042] write(3, "1000", 4) = 4 [pid 5042] close(3) = 0 [pid 5042] memfd_create("syzkaller", 0) = 3 [pid 5042] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 77.418409][ T5041] overlayfs: filesystem on './bus' not supported as upperdir [pid 5042] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5042] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5042] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5042] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5042] ioctl(4, LOOP_CLR_FD) = 0 [pid 5042] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5042] close(4) = 0 [pid 5042] close(3) = 0 [pid 5042] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5042] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5042] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5042] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5042] exit_group(0) = ? [pid 5042] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5042, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=15 /* 0.15 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5043 ./strace-static-x86_64: Process 5043 attached [pid 5043] set_robust_list(0x555555808660, 24) = 0 [pid 5043] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5043] setpgid(0, 0) = 0 [pid 5043] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5043] write(3, "1000", 4) = 4 [pid 5043] close(3) = 0 [pid 5043] memfd_create("syzkaller", 0) = 3 [pid 5043] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 77.674978][ T5042] overlayfs: filesystem on './bus' not supported as upperdir [pid 5043] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5043] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5043] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5043] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5043] ioctl(4, LOOP_CLR_FD) = 0 [pid 5043] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5043] close(4) = 0 [pid 5043] close(3) = 0 [pid 5043] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5043] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5043] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5043] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5043] exit_group(0) = ? [pid 5043] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5043, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=16 /* 0.16 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5044 ./strace-static-x86_64: Process 5044 attached [pid 5044] set_robust_list(0x555555808660, 24) = 0 [pid 5044] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5044] setpgid(0, 0) = 0 [pid 5044] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5044] write(3, "1000", 4) = 4 [pid 5044] close(3) = 0 [pid 5044] memfd_create("syzkaller", 0) = 3 [pid 5044] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 77.937882][ T5043] overlayfs: filesystem on './bus' not supported as upperdir [pid 5044] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5044] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5044] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5044] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5044] ioctl(4, LOOP_CLR_FD) = 0 [pid 5044] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5044] close(4) = 0 [pid 5044] close(3) = 0 [pid 5044] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5044] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5044] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5044] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5044] exit_group(0) = ? [pid 5044] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5044, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=16 /* 0.16 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5045 ./strace-static-x86_64: Process 5045 attached [pid 5045] set_robust_list(0x555555808660, 24) = 0 [pid 5045] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5045] setpgid(0, 0) = 0 [pid 5045] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5045] write(3, "1000", 4) = 4 [pid 5045] close(3) = 0 [pid 5045] memfd_create("syzkaller", 0) = 3 [pid 5045] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 78.203889][ T5044] overlayfs: filesystem on './bus' not supported as upperdir [pid 5045] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5045] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5045] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5045] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5045] ioctl(4, LOOP_CLR_FD) = 0 [pid 5045] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5045] close(4) = 0 [pid 5045] close(3) = 0 [pid 5045] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5045] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5045] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5045] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5045] exit_group(0) = ? [pid 5045] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5045, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=13 /* 0.13 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5046 ./strace-static-x86_64: Process 5046 attached [pid 5046] set_robust_list(0x555555808660, 24) = 0 [pid 5046] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5046] setpgid(0, 0) = 0 [pid 5046] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5046] write(3, "1000", 4) = 4 [pid 5046] close(3) = 0 [pid 5046] memfd_create("syzkaller", 0) = 3 [pid 5046] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 78.467572][ T5045] overlayfs: filesystem on './bus' not supported as upperdir [pid 5046] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5046] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5046] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5046] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5046] ioctl(4, LOOP_CLR_FD) = 0 [pid 5046] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5046] close(4) = 0 [pid 5046] close(3) = 0 [pid 5046] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5046] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5046] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5046] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5046] exit_group(0) = ? [pid 5046] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5046, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=18 /* 0.18 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5047 ./strace-static-x86_64: Process 5047 attached [pid 5047] set_robust_list(0x555555808660, 24) = 0 [pid 5047] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5047] setpgid(0, 0) = 0 [pid 5047] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5047] write(3, "1000", 4) = 4 [pid 5047] close(3) = 0 [pid 5047] memfd_create("syzkaller", 0) = 3 [pid 5047] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 78.714688][ T5046] overlayfs: filesystem on './bus' not supported as upperdir [pid 5047] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5047] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5047] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5047] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5047] ioctl(4, LOOP_CLR_FD) = 0 [pid 5047] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5047] close(4) = 0 [pid 5047] close(3) = 0 [pid 5047] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5047] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5047] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5047] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5047] exit_group(0) = ? [pid 5047] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5047, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=19 /* 0.19 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5048 ./strace-static-x86_64: Process 5048 attached [pid 5048] set_robust_list(0x555555808660, 24) = 0 [pid 5048] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5048] setpgid(0, 0) = 0 [pid 5048] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5048] write(3, "1000", 4) = 4 [pid 5048] close(3) = 0 [pid 5048] memfd_create("syzkaller", 0) = 3 [pid 5048] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 78.987208][ T5047] overlayfs: filesystem on './bus' not supported as upperdir [pid 5048] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5048] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5048] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5048] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5048] ioctl(4, LOOP_CLR_FD) = 0 [pid 5048] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5048] close(4) = 0 [pid 5048] close(3) = 0 [pid 5048] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5048] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5048] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5048] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5048] exit_group(0) = ? [pid 5048] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5048, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5049 ./strace-static-x86_64: Process 5049 attached [pid 5049] set_robust_list(0x555555808660, 24) = 0 [pid 5049] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5049] setpgid(0, 0) = 0 [pid 5049] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5049] write(3, "1000", 4) = 4 [pid 5049] close(3) = 0 [pid 5049] memfd_create("syzkaller", 0) = 3 [pid 5049] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 79.234520][ T5048] overlayfs: filesystem on './bus' not supported as upperdir [pid 5049] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5049] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5049] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5049] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5049] ioctl(4, LOOP_CLR_FD) = 0 [pid 5049] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5049] close(4) = 0 [pid 5049] close(3) = 0 [pid 5049] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5049] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5049] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5049] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5049] exit_group(0) = ? [pid 5049] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5049, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=16 /* 0.16 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5050 ./strace-static-x86_64: Process 5050 attached [pid 5050] set_robust_list(0x555555808660, 24) = 0 [pid 5050] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5050] setpgid(0, 0) = 0 [pid 5050] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5050] write(3, "1000", 4) = 4 [pid 5050] close(3) = 0 [pid 5050] memfd_create("syzkaller", 0) = 3 [pid 5050] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 79.500492][ T5049] overlayfs: filesystem on './bus' not supported as upperdir [pid 5050] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5050] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5050] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5050] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5050] ioctl(4, LOOP_CLR_FD) = 0 [pid 5050] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5050] close(4) = 0 [pid 5050] close(3) = 0 [pid 5050] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5050] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5050] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5050] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5050] exit_group(0) = ? [pid 5050] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5050, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=19 /* 0.19 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5051 ./strace-static-x86_64: Process 5051 attached [pid 5051] set_robust_list(0x555555808660, 24) = 0 [pid 5051] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5051] setpgid(0, 0) = 0 [pid 5051] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5051] write(3, "1000", 4) = 4 [pid 5051] close(3) = 0 [pid 5051] memfd_create("syzkaller", 0) = 3 [pid 5051] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 79.759256][ T5050] overlayfs: filesystem on './bus' not supported as upperdir [pid 5051] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5051] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5051] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5051] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5051] ioctl(4, LOOP_CLR_FD) = 0 [pid 5051] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5051] close(4) = 0 [pid 5051] close(3) = 0 [pid 5051] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5051] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5051] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5051] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5051] exit_group(0) = ? [pid 5051] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5051, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5052 ./strace-static-x86_64: Process 5052 attached [pid 5052] set_robust_list(0x555555808660, 24) = 0 [pid 5052] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5052] setpgid(0, 0) = 0 [pid 5052] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5052] write(3, "1000", 4) = 4 [pid 5052] close(3) = 0 [pid 5052] memfd_create("syzkaller", 0) = 3 [pid 5052] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 80.022823][ T5051] overlayfs: filesystem on './bus' not supported as upperdir [pid 5052] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5052] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5052] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5052] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5052] ioctl(4, LOOP_CLR_FD) = 0 [pid 5052] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5052] close(4) = 0 [pid 5052] close(3) = 0 [pid 5052] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5052] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5052] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5052] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5052] exit_group(0) = ? [pid 5052] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5052, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=19 /* 0.19 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5053 ./strace-static-x86_64: Process 5053 attached [pid 5053] set_robust_list(0x555555808660, 24) = 0 [pid 5053] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5053] setpgid(0, 0) = 0 [pid 5053] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5053] write(3, "1000", 4) = 4 [pid 5053] close(3) = 0 [pid 5053] memfd_create("syzkaller", 0) = 3 [pid 5053] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 80.279185][ T5052] overlayfs: filesystem on './bus' not supported as upperdir [pid 5053] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5053] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5053] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5053] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5053] ioctl(4, LOOP_CLR_FD) = 0 [pid 5053] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5053] close(4) = 0 [pid 5053] close(3) = 0 [pid 5053] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5053] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5053] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5053] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5053] exit_group(0) = ? [pid 5053] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5053, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=15 /* 0.15 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5054 attached , child_tidptr=0x555555808650) = 5054 [pid 5054] set_robust_list(0x555555808660, 24) = 0 [pid 5054] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5054] setpgid(0, 0) = 0 [pid 5054] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5054] write(3, "1000", 4) = 4 [pid 5054] close(3) = 0 [pid 5054] memfd_create("syzkaller", 0) = 3 [pid 5054] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 80.536390][ T5053] overlayfs: filesystem on './bus' not supported as upperdir [pid 5054] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5054] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5054] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5054] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5054] ioctl(4, LOOP_CLR_FD) = 0 [pid 5054] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5054] close(4) = 0 [pid 5054] close(3) = 0 [pid 5054] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5054] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5054] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5054] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5054] exit_group(0) = ? [pid 5054] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5054, si_uid=0, si_status=0, si_utime=6 /* 0.06 s */, si_stime=15 /* 0.15 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5055 ./strace-static-x86_64: Process 5055 attached [pid 5055] set_robust_list(0x555555808660, 24) = 0 [pid 5055] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5055] setpgid(0, 0) = 0 [pid 5055] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5055] write(3, "1000", 4) = 4 [pid 5055] close(3) = 0 [pid 5055] memfd_create("syzkaller", 0) = 3 [pid 5055] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 80.798265][ T5054] overlayfs: filesystem on './bus' not supported as upperdir [pid 5055] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5055] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5055] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5055] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5055] ioctl(4, LOOP_CLR_FD) = 0 [pid 5055] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5055] close(4) = 0 [pid 5055] close(3) = 0 [pid 5055] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5055] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5055] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5055] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5055] exit_group(0) = ? [pid 5055] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5055, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5056 ./strace-static-x86_64: Process 5056 attached [pid 5056] set_robust_list(0x555555808660, 24) = 0 [pid 5056] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5056] setpgid(0, 0) = 0 [pid 5056] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5056] write(3, "1000", 4) = 4 [pid 5056] close(3) = 0 [pid 5056] memfd_create("syzkaller", 0) = 3 [pid 5056] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 81.059830][ T5055] overlayfs: filesystem on './bus' not supported as upperdir [pid 5056] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5056] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5056] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5056] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5056] ioctl(4, LOOP_CLR_FD) = 0 [pid 5056] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5056] close(4) = 0 [pid 5056] close(3) = 0 [pid 5056] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5056] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5056] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5056] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5056] exit_group(0) = ? [pid 5056] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5056, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=18 /* 0.18 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555808650) = 5057 ./strace-static-x86_64: Process 5057 attached [pid 5057] set_robust_list(0x555555808660, 24) = 0 [pid 5057] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5057] setpgid(0, 0) = 0 [pid 5057] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5057] write(3, "1000", 4) = 4 [pid 5057] close(3) = 0 [pid 5057] memfd_create("syzkaller", 0) = 3 [pid 5057] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 81.338801][ T5056] overlayfs: filesystem on './bus' not supported as upperdir [pid 5057] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 20699119) = 20699119 [pid 5057] munmap(0x7f8a225ff000, 20699119) = 0 [pid 5057] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5057] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5057] ioctl(4, LOOP_CLR_FD) = 0 [pid 5057] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5057] close(4) = 0 [pid 5057] close(3) = 0 [pid 5057] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5057] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists) [pid 5057] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists) [pid 5057] mount(NULL, "./bus", "overlay", 0, "workdir=./file1,lowerdir=./file0,upperdir=./bus,index=on") = -1 EINVAL (Invalid argument) [pid 5057] exit_group(0) = ? [pid 5057] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5057, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=16 /* 0.16 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5058 attached , child_tidptr=0x555555808650) = 5058 [pid 5058] set_robust_list(0x555555808660, 24) = 0 [pid 5058] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5058] setpgid(0, 0) = 0 [pid 5058] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5058] write(3, "1000", 4) = 4 [pid 5058] close(3) = 0 [pid 5058] memfd_create("syzkaller", 0) = 3 [pid 5058] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8a225ff000 [ 81.606699][ T5057] overlayfs: filesystem on './bus' not supported as upperdir