./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2395586257 <...> Warning: Permanently added '10.128.0.90' (ED25519) to the list of known hosts. execve("./syz-executor2395586257", ["./syz-executor2395586257"], 0x7fffdb0dd2f0 /* 10 vars */) = 0 brk(NULL) = 0x555555a75000 brk(0x555555a75d00) = 0x555555a75d00 arch_prctl(ARCH_SET_FS, 0x555555a75380) = 0 set_tid_address(0x555555a75650) = 5031 set_robust_list(0x555555a75660, 24) = 0 rseq(0x555555a75ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2395586257", 4096) = 28 getrandom("\xca\x6b\x9d\x08\xe3\x88\x79\x3a", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555555a75d00 brk(0x555555a96d00) = 0x555555a96d00 brk(0x555555a97000) = 0x555555a97000 mprotect(0x7fca63886000, 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) = 0x7fca5b3d6000 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"..., 524288) = 524288 munmap(0x7fca5b3d6000, 138412032) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 mkdir("./bus", 0777) = 0 mount("/dev/loop0", "./bus", "hfsplus", MS_SYNCHRONOUS|MS_NOATIME|MS_POSIXACL, "") = 0 openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 3 chdir("./bus") = 0 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 openat(AT_FDCWD, "./bus", O_RDWR|O_CREAT|O_NONBLOCK|O_SYNC|O_NOATIME, 000) = 4 [ 72.811902][ T5031] syz-executor239[5031]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set [ 72.834718][ T5031] loop0: detected capacity change from 0 to 1024 [ 72.871287][ T5031] [ 72.873667][ T5031] ============================================ [ 72.879842][ T5031] WARNING: possible recursive locking detected [ 72.886011][ T5031] 6.6.0-rc6-syzkaller-00334-g1acfd2bd3f0d #0 Not tainted [ 72.893039][ T5031] -------------------------------------------- [ 72.899192][ T5031] syz-executor239/5031 is trying to acquire lock: [ 72.905623][ T5031] ffff88802026c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x14a/0x1c0 [ 72.915507][ T5031] [ 72.915507][ T5031] but task is already holding lock: [ 72.922884][ T5031] ffff88802026c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x14a/0x1c0 [ 72.932566][ T5031] [ 72.932566][ T5031] other info that might help us debug this: [ 72.940633][ T5031] Possible unsafe locking scenario: [ 72.940633][ T5031] [ 72.948081][ T5031] CPU0 [ 72.951365][ T5031] ---- [ 72.954635][ T5031] lock(&tree->tree_lock/1); [ 72.959337][ T5031] lock(&tree->tree_lock/1); [ 72.964029][ T5031] [ 72.964029][ T5031] *** DEADLOCK *** [ 72.964029][ T5031] [ 72.972172][ T5031] May be due to missing lock nesting notation [ 72.972172][ T5031] [ 72.980494][ T5031] 5 locks held by syz-executor239/5031: [ 72.986036][ T5031] #0: ffff888020268410 (sb_writers#9){.+.+}-{0:0}, at: vfs_write+0x216/0xaf0 [ 72.994971][ T5031] #1: ffff888076fe8300 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}, at: generic_file_write_iter+0x83/0x310 [ 73.006300][ T5031] #2: ffff888076fe8108 (&hip->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x21b/0x1b70 [ 73.016665][ T5031] #3: ffff88802026c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x14a/0x1c0 [ 73.026771][ T5031] #4: ffff888079328108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x21b/0x1b70 [ 73.038283][ T5031] [ 73.038283][ T5031] stack backtrace: [ 73.044184][ T5031] CPU: 0 PID: 5031 Comm: syz-executor239 Not tainted 6.6.0-rc6-syzkaller-00334-g1acfd2bd3f0d #0 [ 73.054613][ T5031] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 [ 73.064666][ T5031] Call Trace: [ 73.067968][ T5031] [ 73.070897][ T5031] dump_stack_lvl+0x1e7/0x2d0 [ 73.075583][ T5031] ? nf_tcp_handle_invalid+0x650/0x650 [ 73.081052][ T5031] ? print_deadlock_bug+0x462/0x600 [ 73.086254][ T5031] ? _find_first_zero_bit+0xd4/0x100 [ 73.091546][ T5031] __lock_acquire+0x6a81/0x7f70 [ 73.096423][ T5031] ? verify_lock_unused+0x140/0x140 [ 73.101634][ T5031] ? lockdep_hardirqs_on_prepare+0x43c/0x7a0 [ 73.107783][ T5031] ? print_irqtrace_events+0x220/0x220 [ 73.113270][ T5031] ? _raw_spin_unlock_irqrestore+0x8f/0x140 [ 73.119181][ T5031] ? lockdep_hardirqs_on+0x98/0x140 [ 73.124384][ T5031] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 73.130281][ T5031] ? _raw_spin_unlock+0x40/0x40 [ 73.135232][ T5031] ? stack_trace_save+0x117/0x1c0 [ 73.140305][ T5031] ? stack_trace_snprint+0xf0/0xf0 [ 73.145439][ T5031] lock_acquire+0x1e3/0x520 [ 73.149948][ T5031] ? hfsplus_find_init+0x14a/0x1c0 [ 73.155073][ T5031] ? read_lock_is_recursive+0x20/0x20 [ 73.160474][ T5031] ? hfsplus_get_block+0x406/0x14e0 [ 73.166037][ T5031] ? __block_write_begin_int+0x54d/0x1ac0 [ 73.171783][ T5031] ? __might_sleep+0xc0/0xc0 [ 73.176385][ T5031] ? generic_file_write_iter+0xaf/0x310 [ 73.181946][ T5031] ? vfs_write+0x782/0xaf0 [ 73.186375][ T5031] ? ksys_write+0x1a0/0x2c0 [ 73.190894][ T5031] ? do_syscall_64+0x41/0xc0 [ 73.195492][ T5031] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 73.201622][ T5031] __mutex_lock+0x136/0xd60 [ 73.206135][ T5031] ? hfsplus_find_init+0x14a/0x1c0 [ 73.211294][ T5031] ? hfsplus_find_init+0x14a/0x1c0 [ 73.216426][ T5031] ? mutex_lock_nested+0x20/0x20 [ 73.221378][ T5031] ? hfsplus_find_init+0x85/0x1c0 [ 73.226421][ T5031] ? rcu_is_watching+0x15/0xb0 [ 73.231186][ T5031] ? hfsplus_find_init+0x85/0x1c0 [ 73.236231][ T5031] ? __kmalloc+0xe6/0x230 [ 73.240557][ T5031] ? rcu_is_watching+0x15/0xb0 [ 73.245320][ T5031] hfsplus_find_init+0x14a/0x1c0 [ 73.250266][ T5031] hfsplus_file_extend+0x454/0x1b70 [ 73.255472][ T5031] ? hfsplus_get_block+0x14e0/0x14e0 [ 73.260759][ T5031] ? __mutex_trylock_common+0x182/0x2e0 [ 73.266361][ T5031] ? __might_sleep+0xc0/0xc0 [ 73.270969][ T5031] ? rcu_is_watching+0x15/0xb0 [ 73.275732][ T5031] ? hfsplus_brec_find+0x19d/0x570 [ 73.280874][ T5031] ? __mutex_lock+0x2ee/0xd60 [ 73.285586][ T5031] hfsplus_bmap_reserve+0x105/0x4e0 [ 73.290819][ T5031] __hfsplus_ext_write_extent+0x2a4/0x5b0 [ 73.296579][ T5031] __hfsplus_ext_cache_extent+0x84/0xe00 [ 73.302232][ T5031] hfsplus_file_extend+0x48c/0x1b70 [ 73.307447][ T5031] ? hfsplus_get_block+0x14e0/0x14e0 [ 73.312735][ T5031] ? find_lock_entries+0x1110/0x1110 [ 73.318023][ T5031] ? clean_bdev_aliases+0x66a/0x770 [ 73.323222][ T5031] hfsplus_get_block+0x406/0x14e0 [ 73.328253][ T5031] ? hfsplus_ext_write_extent+0x1f0/0x1f0 [ 73.333979][ T5031] ? _raw_spin_unlock+0x28/0x40 [ 73.338842][ T5031] ? folio_create_buffers+0x132/0x250 [ 73.344211][ T5031] __block_write_begin_int+0x54d/0x1ac0 [ 73.349766][ T5031] ? folio_add_lru+0x27b/0x9d0 [ 73.354535][ T5031] ? hfsplus_ext_write_extent+0x1f0/0x1f0 [ 73.360257][ T5031] ? folio_zero_new_buffers+0x530/0x530 [ 73.365823][ T5031] ? pagecache_get_page+0x243/0x590 [ 73.371032][ T5031] ? hfsplus_ext_write_extent+0x1f0/0x1f0 [ 73.376756][ T5031] block_write_begin+0x9b/0x1e0 [ 73.381612][ T5031] cont_write_begin+0x643/0x880 [ 73.386488][ T5031] ? fault_in_readable+0x165/0x2b0 [ 73.391642][ T5031] ? generic_cont_expand_simple+0x2a0/0x2a0 [ 73.397567][ T5031] ? fault_in_readable+0x1a6/0x2b0 [ 73.402684][ T5031] ? fault_in_safe_writeable+0x260/0x260 [ 73.408327][ T5031] hfsplus_write_begin+0x8a/0xd0 [ 73.413266][ T5031] ? hfsplus_ext_write_extent+0x1f0/0x1f0 [ 73.419006][ T5031] generic_perform_write+0x31b/0x630 [ 73.424308][ T5031] ? generic_file_direct_write+0x3f0/0x3f0 [ 73.430131][ T5031] ? __generic_file_write_iter+0x101/0x230 [ 73.435957][ T5031] generic_file_write_iter+0xaf/0x310 [ 73.441342][ T5031] vfs_write+0x782/0xaf0 [ 73.445598][ T5031] ? file_end_write+0x250/0x250 [ 73.450464][ T5031] ? lockdep_hardirqs_on+0x98/0x140 [ 73.455755][ T5031] ? __fdget_pos+0x2c7/0x340 [ 73.460352][ T5031] ksys_write+0x1a0/0x2c0 [ 73.464692][ T5031] ? __ia32_sys_read+0x90/0x90 [ 73.469481][ T5031] ? syscall_enter_from_user_mode+0x32/0x230 [ 73.475480][ T5031] ? syscall_enter_from_user_mode+0x8c/0x230 [ 73.481475][ T5031] do_syscall_64+0x41/0xc0 [ 73.485920][ T5031] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 73.491825][ T5031] RIP: 0033:0x7fca63813639 [ 73.496254][ T5031] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 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 [ 73.515865][ T5031] RSP: 002b:00007ffde25b29a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 73.524279][ T5031] RAX: ffffffffffffffda RBX: 00007ffde25b2b78 RCX: 00007fca63813639 [ 73.532256][ T5031] RDX: 00000000fffffff0 RSI: 0000000020004200 RDI: 0000000000000004 [ 73.540224][ T5031] RBP: 00007fca63886610 R08: 0000000000000000 R09: 00007ffde25b2b78 [ 73.548195][ T5031] R10: 0000000000000647 R11: 0000000000000246 R12: 0000000000000001 [ 73.556205][ T5031] R13: 00007ffde25b2b68 R14: 0000000000000001 R15: 0000000000000001 [ 73.564199][ T5031]