./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1963126828 <...> Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. execve("./syz-executor1963126828", ["./syz-executor1963126828"], 0x7ffc7e633340 /* 10 vars */) = 0 brk(NULL) = 0x55555603c000 brk(0x55555603cc40) = 0x55555603cc40 arch_prctl(ARCH_SET_FS, 0x55555603c300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor1963126828", 4096) = 28 brk(0x55555605dc40) = 0x55555605dc40 brk(0x55555605e000) = 0x55555605e000 mprotect(0x7f59a8873000, 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) = 0x7f59a03ba000 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(0x7f59a03ba000, 524288) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 mkdir("./file2", 0777) = 0 mount("/dev/loop0", "./file2", "hfsplus", MS_POSIXACL|MS_LAZYTIME, "") = 0 openat(AT_FDCWD, "./file2", O_RDONLY|O_DIRECTORY) = 3 chdir("./file2") = 0 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 [ 52.334982][ T5070] loop0: detected capacity change from 0 to 1024 [ 52.360033][ T5070] hfsplus: xattr searching failed [ 52.366060][ T5070] [ 52.368396][ T5070] ============================================ [ 52.374548][ T5070] WARNING: possible recursive locking detected [ 52.380703][ T5070] 6.2.0-rc1-syzkaller-00043-g2258c2dc850b #0 Not tainted [ 52.387704][ T5070] -------------------------------------------- [ 52.393826][ T5070] syz-executor196/5070 is trying to acquire lock: [ 52.400211][ T5070] ffff888079d09548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x27b/0x9b0 [ 52.410997][ T5070] [ 52.410997][ T5070] but task is already holding lock: [ 52.418350][ T5070] ffff888079d0a988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 52.429544][ T5070] [ 52.429544][ T5070] other info that might help us debug this: [ 52.437578][ T5070] Possible unsafe locking scenario: [ 52.437578][ T5070] [ 52.445000][ T5070] CPU0 [ 52.448257][ T5070] ---- [ 52.451533][ T5070] lock(&HFSPLUS_I(inode)->extents_lock); [ 52.457333][ T5070] lock(&HFSPLUS_I(inode)->extents_lock); [ 52.463114][ T5070] [ 52.463114][ T5070] *** DEADLOCK *** [ 52.463114][ T5070] [ 52.471231][ T5070] May be due to missing lock nesting notation [ 52.471231][ T5070] [ 52.479525][ T5070] 4 locks held by syz-executor196/5070: [ 52.485043][ T5070] #0: ffff888079d72460 (sb_writers#9){.+.+}-{0:0}, at: path_openat+0x19b3/0x2a50 [ 52.494249][ T5070] #1: ffff888079d0ab80 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: do_truncate+0x131/0x200 [ 52.504583][ T5070] #2: ffff888079d0a988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 52.516219][ T5070] #3: ffff88807a2bd8f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xdd/0x500 [ 52.526203][ T5070] [ 52.526203][ T5070] stack backtrace: [ 52.532082][ T5070] CPU: 1 PID: 5070 Comm: syz-executor196 Not tainted 6.2.0-rc1-syzkaller-00043-g2258c2dc850b #0 [ 52.542467][ T5070] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 52.552516][ T5070] Call Trace: [ 52.555776][ T5070] [ 52.558688][ T5070] dump_stack_lvl+0xd1/0x138 [ 52.563261][ T5070] __lock_acquire.cold+0x116/0x3a7 [ 52.568355][ T5070] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 52.574313][ T5070] ? save_trace+0x43/0xad0 [ 52.578713][ T5070] ? create_page_buffers+0x440/0x640 [ 52.583980][ T5070] lock_acquire+0x1e3/0x630 [ 52.588463][ T5070] ? hfsplus_get_block+0x27b/0x9b0 [ 52.593557][ T5070] ? lock_release+0x810/0x810 [ 52.598217][ T5070] __mutex_lock+0x12f/0x1360 [ 52.602792][ T5070] ? hfsplus_get_block+0x27b/0x9b0 [ 52.607884][ T5070] ? hfsplus_get_block+0x27b/0x9b0 [ 52.612978][ T5070] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 52.618530][ T5070] ? find_held_lock+0x2d/0x110 [ 52.623280][ T5070] ? create_page_buffers+0x440/0x640 [ 52.628563][ T5070] ? lock_downgrade+0x6e0/0x6e0 [ 52.633395][ T5070] hfsplus_get_block+0x27b/0x9b0 [ 52.638316][ T5070] block_read_full_folio+0x35b/0x9d0 [ 52.643597][ T5070] ? hfsplus_file_extend+0xf60/0xf60 [ 52.648886][ T5070] ? create_page_buffers+0x640/0x640 [ 52.654150][ T5070] ? folio_flags.constprop.0+0x53/0x150 [ 52.659679][ T5070] ? folio_add_lru+0x37b/0x680 [ 52.664427][ T5070] ? hfsplus_bmap+0x30/0x30 [ 52.668910][ T5070] filemap_read_folio+0xdb/0x2c0 [ 52.673832][ T5070] ? __folio_lock_killable+0x20/0x20 [ 52.679113][ T5070] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 52.684661][ T5070] ? __mutex_lock+0x231/0x1360 [ 52.689413][ T5070] do_read_cache_folio+0x1df/0x510 [ 52.694511][ T5070] ? hfsplus_bmap+0x30/0x30 [ 52.699000][ T5070] read_cache_page+0x5d/0x160 [ 52.703673][ T5070] hfsplus_block_free+0x13d/0x500 [ 52.708700][ T5070] ? hfsplus_find_init+0x95/0x230 [ 52.713708][ T5070] hfsplus_free_extents+0x1ff/0x4f0 [ 52.718889][ T5070] hfsplus_file_truncate+0xe36/0x10d0 [ 52.724248][ T5070] ? hfsplus_get_block+0x9b0/0x9b0 [ 52.729343][ T5070] ? unmap_mapping_pages+0x270/0x270 [ 52.734612][ T5070] ? setattr_prepare+0x13c/0xc30 [ 52.739556][ T5070] hfsplus_setattr+0x1f2/0x320 [ 52.744301][ T5070] ? hfsplus_file_fsync+0x5b0/0x5b0 [ 52.749497][ T5070] notify_change+0xca7/0x1420 [ 52.754160][ T5070] ? do_truncate+0x143/0x200 [ 52.758737][ T5070] do_truncate+0x143/0x200 [ 52.763150][ T5070] ? file_open_root+0x430/0x430 [ 52.767985][ T5070] ? process_measurement+0x18b0/0x18b0 [ 52.773437][ T5070] ? hfsplus_getattr+0x2e0/0x2e0 [ 52.778357][ T5070] path_openat+0x2157/0x2a50 [ 52.782933][ T5070] ? path_lookupat+0x840/0x840 [ 52.787682][ T5070] do_filp_open+0x1ba/0x410 [ 52.792167][ T5070] ? may_open_dev+0xf0/0xf0 [ 52.796653][ T5070] ? find_held_lock+0x2d/0x110 [ 52.801404][ T5070] ? do_raw_spin_lock+0x124/0x2b0 [ 52.806409][ T5070] ? rwlock_bug.part.0+0x90/0x90 [ 52.811326][ T5070] ? _raw_spin_unlock+0x28/0x40 [ 52.816161][ T5070] ? alloc_fd+0x2d8/0x6d0 [ 52.820470][ T5070] do_sys_openat2+0x16d/0x4c0 [ 52.825140][ T5070] ? find_held_lock+0x2d/0x110 [ 52.829892][ T5070] ? build_open_flags+0x6f0/0x6f0 [ 52.834894][ T5070] ? ptrace_notify+0xfe/0x140 [ 52.839557][ T5070] ? lock_downgrade+0x6e0/0x6e0 [ 52.844394][ T5070] __x64_sys_creat+0xcd/0x120 [ 52.849053][ T5070] ? __x64_compat_sys_openat+0x1f0/0x1f0 [ 52.854664][ T5070] ? _raw_spin_unlock_irq+0x2e/0x50 [ 52.859847][ T5070] ? ptrace_notify+0xfe/0x140 [ 52.864502][ T5070] ? syscall_trace_enter.constprop.0+0xb0/0x250 [ 52.870744][ T5070] do_syscall_64+0x39/0xb0 [ 52.875146][ T5070] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 52.881024][ T5070] RIP: 0033:0x7f59a8806759 [ 52.885418][ T5070] 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 [ 52.905027][ T5070] RSP: 002b:00007ffe48385e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 52.913438][ T5070] RAX: ffffffffffffffda RBX: 0032656c69662f2e RCX: 00007f59a8806759 [ 52.921392][ T5070] RDX: 00007f59a87c4dd3 RSI: 0000000000000020 RDI: 0000000020000180 [ 52.929343][ T5070] RBP: 00007f59a87c5ff0 R08: 00000000000005cd R09: 0000000000000000 creat("./file2", 040) = 4 exit_group(0) = ? +++ exited with 0 +++ [ 5