./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor883858768 <...> Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. execve("./syz-executor883858768", ["./syz-executor883858768"], 0x7fff6cdbe730 /* 10 vars */) = 0 brk(NULL) = 0x555555ad1000 brk(0x555555ad1c40) = 0x555555ad1c40 arch_prctl(ARCH_SET_FS, 0x555555ad1300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor883858768", 4096) = 27 brk(0x555555af2c40) = 0x555555af2c40 brk(0x555555af3000) = 0x555555af3000 mprotect(0x7f8277d8f000, 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) = 0x7f826f8d6000 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(0x7f826f8d6000, 524288) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 mkdir("./file0", 0777) = 0 mount("/dev/loop0", "./file0", "hfsplus", 0, "") = 0 openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 chdir("./file0") = 0 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 [ 53.031660][ T5062] loop0: detected capacity change from 0 to 1024 [ 53.067200][ T5062] [ 53.069554][ T5062] ============================================ [ 53.075690][ T5062] WARNING: possible recursive locking detected [ 53.081833][ T5062] 6.2.0-rc1-syzkaller #0 Not tainted [ 53.087178][ T5062] -------------------------------------------- [ 53.093320][ T5062] syz-executor883/5062 is trying to acquire lock: [ 53.099703][ T5062] ffff888075789548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x27b/0x9b0 [ 53.110489][ T5062] [ 53.110489][ T5062] but task is already holding lock: [ 53.117828][ T5062] ffff88807578a988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 53.129111][ T5062] [ 53.129111][ T5062] other info that might help us debug this: [ 53.137161][ T5062] Possible unsafe locking scenario: [ 53.137161][ T5062] [ 53.144588][ T5062] CPU0 [ 53.147843][ T5062] ---- [ 53.151101][ T5062] lock(&HFSPLUS_I(inode)->extents_lock); [ 53.156905][ T5062] lock(&HFSPLUS_I(inode)->extents_lock); [ 53.162689][ T5062] [ 53.162689][ T5062] *** DEADLOCK *** [ 53.162689][ T5062] [ 53.170807][ T5062] May be due to missing lock nesting notation [ 53.170807][ T5062] [ 53.179103][ T5062] 4 locks held by syz-executor883/5062: [ 53.184623][ T5062] #0: ffff88802a33c460 (sb_writers#9){.+.+}-{0:0}, at: path_openat+0x19b3/0x2a50 [ 53.193834][ T5062] #1: ffff88807578ab80 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: do_truncate+0x131/0x200 [ 53.204184][ T5062] #2: ffff88807578a988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 53.215904][ T5062] #3: ffff88802185c0f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xdd/0x500 [ 53.225976][ T5062] [ 53.225976][ T5062] stack backtrace: [ 53.232101][ T5062] CPU: 0 PID: 5062 Comm: syz-executor883 Not tainted 6.2.0-rc1-syzkaller #0 [ 53.240748][ T5062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 53.250786][ T5062] Call Trace: [ 53.254065][ T5062] [ 53.256975][ T5062] dump_stack_lvl+0xd1/0x138 [ 53.261553][ T5062] __lock_acquire.cold+0x116/0x3a7 [ 53.266648][ T5062] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 53.272609][ T5062] ? save_trace+0x43/0xad0 [ 53.277009][ T5062] ? create_page_buffers+0x440/0x640 [ 53.282277][ T5062] lock_acquire+0x1e3/0x630 [ 53.286761][ T5062] ? hfsplus_get_block+0x27b/0x9b0 [ 53.291860][ T5062] ? lock_release+0x810/0x810 [ 53.296515][ T5062] __mutex_lock+0x12f/0x1360 [ 53.301093][ T5062] ? hfsplus_get_block+0x27b/0x9b0 [ 53.306185][ T5062] ? hfsplus_get_block+0x27b/0x9b0 [ 53.311281][ T5062] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 53.317068][ T5062] ? find_held_lock+0x2d/0x110 [ 53.321821][ T5062] ? create_page_buffers+0x440/0x640 [ 53.327102][ T5062] ? lock_downgrade+0x6e0/0x6e0 [ 53.331934][ T5062] hfsplus_get_block+0x27b/0x9b0 [ 53.336857][ T5062] block_read_full_folio+0x35b/0x9d0 [ 53.342122][ T5062] ? hfsplus_file_extend+0xf60/0xf60 [ 53.347387][ T5062] ? create_page_buffers+0x640/0x640 [ 53.352740][ T5062] ? folio_flags.constprop.0+0x53/0x150 [ 53.358371][ T5062] ? folio_add_lru+0x37b/0x680 [ 53.363121][ T5062] ? hfsplus_bmap+0x30/0x30 [ 53.367604][ T5062] filemap_read_folio+0xdb/0x2c0 [ 53.372525][ T5062] ? __folio_lock_killable+0x20/0x20 [ 53.377793][ T5062] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 53.383330][ T5062] ? __mutex_lock+0x231/0x1360 [ 53.388172][ T5062] do_read_cache_folio+0x1df/0x510 [ 53.393266][ T5062] ? hfsplus_bmap+0x30/0x30 [ 53.397750][ T5062] read_cache_page+0x5d/0x160 [ 53.402415][ T5062] hfsplus_block_free+0x13d/0x500 [ 53.407426][ T5062] ? hfsplus_find_init+0x95/0x230 [ 53.412540][ T5062] hfsplus_free_extents+0x1ff/0x4f0 [ 53.417721][ T5062] hfsplus_file_truncate+0xe36/0x10d0 [ 53.423080][ T5062] ? hfsplus_get_block+0x9b0/0x9b0 [ 53.428364][ T5062] ? unmap_mapping_pages+0x270/0x270 [ 53.433633][ T5062] ? setattr_prepare+0x13c/0xc30 [ 53.438557][ T5062] hfsplus_setattr+0x1f2/0x320 [ 53.443304][ T5062] ? hfsplus_file_fsync+0x5b0/0x5b0 [ 53.448573][ T5062] notify_change+0xca7/0x1420 [ 53.453237][ T5062] ? do_truncate+0x143/0x200 [ 53.457810][ T5062] do_truncate+0x143/0x200 [ 53.462211][ T5062] ? file_open_root+0x430/0x430 [ 53.467220][ T5062] ? process_measurement+0x18b0/0x18b0 [ 53.472832][ T5062] ? hfsplus_getattr+0x2e0/0x2e0 [ 53.477754][ T5062] path_openat+0x2157/0x2a50 [ 53.482331][ T5062] ? ___slab_alloc+0x901/0x1400 [ 53.487203][ T5062] ? path_lookupat+0x840/0x840 [ 53.491949][ T5062] do_filp_open+0x1ba/0x410 [ 53.496610][ T5062] ? may_open_dev+0xf0/0xf0 [ 53.501102][ T5062] ? find_held_lock+0x2d/0x110 [ 53.505852][ T5062] ? do_raw_spin_lock+0x124/0x2b0 [ 53.510852][ T5062] ? rwlock_bug.part.0+0x90/0x90 [ 53.515782][ T5062] ? _raw_spin_unlock+0x28/0x40 [ 53.520613][ T5062] ? alloc_fd+0x2d8/0x6d0 [ 53.524923][ T5062] do_sys_openat2+0x16d/0x4c0 [ 53.529578][ T5062] ? find_held_lock+0x2d/0x110 [ 53.534327][ T5062] ? build_open_flags+0x6f0/0x6f0 [ 53.539328][ T5062] ? ptrace_notify+0xfe/0x140 [ 53.543989][ T5062] ? lock_downgrade+0x6e0/0x6e0 [ 53.548821][ T5062] __x64_sys_creat+0xcd/0x120 [ 53.553483][ T5062] ? __x64_compat_sys_openat+0x1f0/0x1f0 [ 53.559114][ T5062] ? _raw_spin_unlock_irq+0x2e/0x50 [ 53.564381][ T5062] ? ptrace_notify+0xfe/0x140 [ 53.569040][ T5062] ? syscall_trace_enter.constprop.0+0xb0/0x250 [ 53.575261][ T5062] do_syscall_64+0x39/0xb0 [ 53.579663][ T5062] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 53.585537][ T5062] RIP: 0033:0x7f8277d22779 [ 53.589930][ T5062] 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 [ 53.609523][ T5062] RSP: 002b:00007fffa53d1a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 53.617915][ T5062] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8277d22779 [ 53.625867][ T5062] RDX: 00007f8277ce0df3 RSI: 0000000000000000 RDI: 0000000020000000 creat("./file1", 000) = 4 exit_group(0) = ? +++ exited with 0 +++ [ 53.6338