./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor767387488 <...> Warning: Permanently added '10.128.1.52' (ECDSA) to the list of known hosts. execve("./syz-executor767387488", ["./syz-executor767387488"], 0x7ffe7679cc50 /* 10 vars */) = 0 brk(NULL) = 0x55555580b000 brk(0x55555580bc40) = 0x55555580bc40 arch_prctl(ARCH_SET_FS, 0x55555580b300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor767387488", 4096) = 27 brk(0x55555582cc40) = 0x55555582cc40 brk(0x55555582d000) = 0x55555582d000 mprotect(0x7f9c6c310000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 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 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9c63e56000 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"..., 4194304) = 4194304 munmap(0x7f9c63e56000, 4194304) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 syzkaller login: [ 71.004342][ T4996] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=4996 'syz-executor767' ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 mkdir("./file0", 0777) = 0 [ 71.061288][ T4996] loop0: detected capacity change from 0 to 8192 [ 71.073588][ T4996] REISERFS warning: read_super_block: reiserfs filesystem is deprecated and scheduled to be removed from the kernel in 2025 [ 71.086962][ T4996] REISERFS (device loop0): found reiserfs format "3.6" with non-standard journal [ 71.096380][ T4996] REISERFS (device loop0): using ordered data mode [ 71.102908][ T4996] reiserfs: using flush barriers [ 71.109450][ T4996] REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 [ 71.126357][ T4996] REISERFS (device loop0): checking transaction log (loop0) [ 71.136288][ T4996] REISERFS (device loop0): Using r5 hash to sort names [ 71.144374][ T4996] REISERFS warning (device loop0): jdm-13090 reiserfs_new_inode: ACLs aren't enabled in the fs, but vfs thinks they are! mount("/dev/loop0", "./file0", "reiserfs", MS_DIRSYNC|MS_POSIXACL, "") = 0 openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 chdir("./file0") = 0 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 [ 71.157451][ T4996] REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. [ 71.183855][ T4996] [ 71.186226][ T4996] ====================================================== [ 71.193272][ T4996] WARNING: possible circular locking dependency detected [ 71.200313][ T4996] 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0 Not tainted [ 71.207519][ T4996] ------------------------------------------------------ [ 71.214535][ T4996] syz-executor767/4996 is trying to acquire lock: [ 71.220961][ T4996] ffff8880748e0980 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}, at: open_xa_dir+0x136/0x610 [ 71.230932][ T4996] [ 71.230932][ T4996] but task is already holding lock: [ 71.238481][ T4996] ffff888015aae090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x5f/0xd0 [ 71.248069][ T4996] [ 71.248069][ T4996] which lock already depends on the new lock. [ 71.248069][ T4996] [ 71.258463][ T4996] [ 71.258463][ T4996] the existing dependency chain (in reverse order) is: [ 71.267482][ T4996] [ 71.267482][ T4996] -> #1 (&sbi->lock){+.+.}-{3:3}: [ 71.274703][ T4996] lock_acquire+0x1e3/0x520 [ 71.279732][ T4996] __mutex_lock_common+0x1d8/0x2530 [ 71.285462][ T4996] mutex_lock_nested+0x1b/0x20 [ 71.290757][ T4996] reiserfs_write_lock+0x7a/0xd0 [ 71.296218][ T4996] reiserfs_mkdir+0x321/0x8f0 [ 71.301416][ T4996] open_xa_dir+0x2cd/0x610 [ 71.306351][ T4996] xattr_lookup+0x24/0x280 [ 71.311288][ T4996] reiserfs_xattr_set_handle+0xfc/0xdc0 [ 71.317351][ T4996] reiserfs_security_write+0x157/0x1d0 [ 71.323332][ T4996] reiserfs_new_inode+0x1631/0x1d40 [ 71.329048][ T4996] reiserfs_mkdir+0x5b0/0x8f0 [ 71.334283][ T4996] vfs_mkdir+0x29d/0x450 [ 71.339102][ T4996] do_mkdirat+0x264/0x520 [ 71.344064][ T4996] __x64_sys_mkdir+0x6e/0x80 [ 71.349172][ T4996] do_syscall_64+0x41/0xc0 [ 71.354103][ T4996] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 71.360701][ T4996] [ 71.360701][ T4996] -> #0 (&type->i_mutex_dir_key#6/3){+.+.}-{3:3}: [ 71.369612][ T4996] validate_chain+0x166b/0x58f0 [ 71.374995][ T4996] __lock_acquire+0x1316/0x2070 [ 71.380376][ T4996] lock_acquire+0x1e3/0x520 [ 71.385412][ T4996] down_write_nested+0x3d/0x50 [ 71.390811][ T4996] open_xa_dir+0x136/0x610 [ 71.395773][ T4996] xattr_lookup+0x24/0x280 [ 71.400718][ T4996] reiserfs_xattr_get+0xfd/0x570 [ 71.406182][ T4996] __vfs_getxattr+0x436/0x470 [ 71.411382][ T4996] smk_fetch+0xb1/0x140 [ 71.416075][ T4996] smack_d_instantiate+0x6d9/0xb40 [ 71.421724][ T4996] security_d_instantiate+0x9b/0xf0 [ 71.427461][ T4996] d_instantiate_new+0x65/0x120 [ 71.432926][ T4996] reiserfs_mkdir+0x769/0x8f0 [ 71.438133][ T4996] vfs_mkdir+0x29d/0x450 [ 71.442895][ T4996] do_mkdirat+0x264/0x520 [ 71.447741][ T4996] __x64_sys_mkdir+0x6e/0x80 [ 71.453268][ T4996] do_syscall_64+0x41/0xc0 [ 71.458324][ T4996] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 71.464740][ T4996] [ 71.464740][ T4996] other info that might help us debug this: [ 71.464740][ T4996] [ 71.474958][ T4996] Possible unsafe locking scenario: [ 71.474958][ T4996] [ 71.482921][ T4996] CPU0 CPU1 [ 71.488277][ T4996] ---- ---- [ 71.493636][ T4996] lock(&sbi->lock); [ 71.497636][ T4996] lock(&type->i_mutex_dir_key#6/3); [ 71.505555][ T4996] lock(&sbi->lock); [ 71.512057][ T4996] lock(&type->i_mutex_dir_key#6/3); [ 71.517443][ T4996] [ 71.517443][ T4996] *** DEADLOCK *** [ 71.517443][ T4996] [ 71.525579][ T4996] 3 locks held by syz-executor767/4996: [ 71.531115][ T4996] #0: ffff88807d7ac460 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 [ 71.540272][ T4996] #1: ffff8880748e02e0 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: filename_create+0x260/0x530 [ 71.551087][ T4996] #2: ffff888015aae090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x5f/0xd0 [ 71.561144][ T4996] [ 71.561144][ T4996] stack backtrace: [ 71.567030][ T4996] CPU: 0 PID: 4996 Comm: syz-executor767 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0 [ 71.577447][ T4996] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 [ 71.587501][ T4996] Call Trace: [ 71.590782][ T4996] [ 71.593714][ T4996] dump_stack_lvl+0x1e7/0x2d0 [ 71.598396][ T4996] ? nf_tcp_handle_invalid+0x650/0x650 [ 71.603864][ T4996] ? print_circular_bug+0x12b/0x1a0 [ 71.609070][ T4996] check_noncircular+0x2fe/0x3b0 [ 71.614010][ T4996] ? read_lock_is_recursive+0x20/0x20 [ 71.619386][ T4996] ? add_chain_block+0x850/0x850 [ 71.624336][ T4996] ? lockdep_lock+0x123/0x2b0 [ 71.629019][ T4996] ? check_path+0x40/0x40 [ 71.633352][ T4996] ? noop_count+0x30/0x30 [ 71.637768][ T4996] ? _find_first_zero_bit+0xd4/0x100 [ 71.643051][ T4996] validate_chain+0x166b/0x58f0 [ 71.647908][ T4996] ? stack_trace_save+0x1c0/0x1c0 [ 71.652943][ T4996] ? reacquire_held_locks+0x660/0x660 [ 71.658323][ T4996] ? look_up_lock_class+0x77/0x140 [ 71.663435][ T4996] ? register_lock_class+0x104/0x990 [ 71.668723][ T4996] ? __lock_acquire+0x1316/0x2070 [ 71.673748][ T4996] ? is_dynamic_key+0x1f0/0x1f0 [ 71.679120][ T4996] ? mark_lock+0x9a/0x340 [ 71.683463][ T4996] __lock_acquire+0x1316/0x2070 [ 71.688327][ T4996] lock_acquire+0x1e3/0x520 [ 71.692838][ T4996] ? open_xa_dir+0x136/0x610 [ 71.697433][ T4996] ? read_lock_is_recursive+0x20/0x20 [ 71.702812][ T4996] ? lockdep_hardirqs_on+0x98/0x140 [ 71.708014][ T4996] ? __might_sleep+0xc0/0xc0 [ 71.712607][ T4996] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 71.718499][ T4996] ? _raw_spin_unlock+0x40/0x40 [ 71.723348][ T4996] ? stack_trace_snprint+0xf0/0xf0 [ 71.728464][ T4996] down_write_nested+0x3d/0x50 [ 71.733261][ T4996] ? open_xa_dir+0x136/0x610 [ 71.737884][ T4996] open_xa_dir+0x136/0x610 [ 71.742313][ T4996] ? kasan_set_track+0x61/0x70 [ 71.747134][ T4996] ? kasan_set_track+0x4f/0x70 [ 71.751931][ T4996] ? security_d_instantiate+0x9b/0xf0 [ 71.757331][ T4996] ? listxattr_filler+0x500/0x500 [ 71.762374][ T4996] ? __x64_sys_mkdir+0x6e/0x80 [ 71.767146][ T4996] xattr_lookup+0x24/0x280 [ 71.771595][ T4996] reiserfs_xattr_get+0xfd/0x570 [ 71.776538][ T4996] ? security_get+0x6d/0xc0 [ 71.781045][ T4996] ? security_list+0x80/0x80 [ 71.785635][ T4996] __vfs_getxattr+0x436/0x470 [ 71.790330][ T4996] smk_fetch+0xb1/0x140 [ 71.794492][ T4996] smack_d_instantiate+0x6d9/0xb40 [ 71.799616][ T4996] ? smack_sem_semop+0x230/0x230 [ 71.804554][ T4996] ? __raw_spin_lock_init+0x45/0x100 [ 71.809846][ T4996] security_d_instantiate+0x9b/0xf0 [ 71.815050][ T4996] d_instantiate_new+0x65/0x120 [ 71.819900][ T4996] reiserfs_mkdir+0x769/0x8f0 [ 71.824582][ T4996] ? reiserfs_symlink+0x720/0x720 [ 71.829601][ T4996] ? from_kgid+0x1a7/0x730 [ 71.834034][ T4996] ? bpf_lsm_inode_mkdir+0x9/0x10 [ 71.839053][ T4996] ? security_inode_mkdir+0xb8/0x100 [ 71.844362][ T4996] vfs_mkdir+0x29d/0x450 [ 71.848611][ T4996] do_mkdirat+0x264/0x520 [ 71.852936][ T4996] ? vfs_mkdir+0x450/0x450 [ 71.857353][ T4996] ? getname_flags+0x1f0/0x4e0 [ 71.862127][ T4996] __x64_sys_mkdir+0x6e/0x80 [ 71.866723][ T4996] do_syscall_64+0x41/0xc0 [ 71.871137][ T4996] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 71.877035][ T4996] RIP: 0033:0x7f9c6c2a2819 [ 71.881444][ T4996] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48 [ 71.901058][ T4996] RSP: 002b:00007ffd82487f08 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 71.909576][ T4996] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9c6c2a2819 [ 71.917560][ T4996] RDX: 00007f9c6c260e93 RSI: 0000000000000000 RDI: 0000000020000040 [ 71.925532][ T4996] RBP: 00007f9c6c2620b0 R08: 00000000000010e8 R09: 0000000000000000 mkdir("./file1", 000) = 0 exit_group(0) = ? +++ exited with 0 +++ [ 71.933604][ T4996] R10: 00007ffd82487dd