./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4209252903 <...> Warning: Permanently added '10.128.1.70' (ECDSA) to the list of known hosts. execve("./syz-executor4209252903", ["./syz-executor4209252903"], 0x7fff3198bda0 /* 10 vars */) = 0 brk(NULL) = 0x555555af9000 brk(0x555555af9c40) = 0x555555af9c40 arch_prctl(ARCH_SET_FS, 0x555555af9300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor4209252903", 4096) = 28 brk(0x555555b1ac40) = 0x555555b1ac40 brk(0x555555b1b000) = 0x555555b1b000 mprotect(0x7f4ad9612000, 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) = 0x7f4ad1159000 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(0x7f4ad1159000, 524288) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 mkdir("./file1", 0777) = 0 mount("/dev/loop0", "./file1", "hfsplus", MS_POSIXACL|MS_LAZYTIME, "") = 0 openat(AT_FDCWD, "./file1", O_RDONLY|O_DIRECTORY) = 3 chdir("./file1") = 0 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 syzkaller login: [ 49.169060][ T5061] loop0: detected capacity change from 0 to 1024 [ 49.193230][ T5061] hfsplus: xattr searching failed [ 49.199081][ T5061] [ 49.201419][ T5061] ============================================ [ 49.207668][ T5061] WARNING: possible recursive locking detected [ 49.213877][ T5061] 6.2.0-rc1-syzkaller-00116-g150aae354b81 #0 Not tainted [ 49.220880][ T5061] -------------------------------------------- [ 49.227053][ T5061] syz-executor420/5061 is trying to acquire lock: [ 49.233441][ T5061] ffff888027d81548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x27b/0x9b0 [ 49.244231][ T5061] [ 49.244231][ T5061] but task is already holding lock: [ 49.251570][ T5061] ffff888027d82988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 49.262765][ T5061] [ 49.262765][ T5061] other info that might help us debug this: [ 49.270801][ T5061] Possible unsafe locking scenario: [ 49.270801][ T5061] [ 49.278225][ T5061] CPU0 [ 49.281482][ T5061] ---- [ 49.284739][ T5061] lock(&HFSPLUS_I(inode)->extents_lock); [ 49.290522][ T5061] lock(&HFSPLUS_I(inode)->extents_lock); [ 49.296303][ T5061] [ 49.296303][ T5061] *** DEADLOCK *** [ 49.296303][ T5061] [ 49.304422][ T5061] May be due to missing lock nesting notation [ 49.304422][ T5061] [ 49.312729][ T5061] 4 locks held by syz-executor420/5061: [ 49.318249][ T5061] #0: ffff88802820a460 (sb_writers#9){.+.+}-{0:0}, at: path_openat+0x19b3/0x2a50 [ 49.327458][ T5061] #1: ffff888027d82b80 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: do_truncate+0x131/0x200 [ 49.337881][ T5061] #2: ffff888027d82988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 49.349607][ T5061] #3: ffff8880286ef0f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xdd/0x500 [ 49.359593][ T5061] [ 49.359593][ T5061] stack backtrace: [ 49.365458][ T5061] CPU: 1 PID: 5061 Comm: syz-executor420 Not tainted 6.2.0-rc1-syzkaller-00116-g150aae354b81 #0 [ 49.375849][ T5061] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 49.385884][ T5061] Call Trace: [ 49.389229][ T5061] [ 49.392142][ T5061] dump_stack_lvl+0xd1/0x138 [ 49.396748][ T5061] __lock_acquire.cold+0x116/0x3a7 [ 49.401844][ T5061] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 49.407830][ T5061] ? save_trace+0x43/0xad0 [ 49.412236][ T5061] ? create_page_buffers+0x440/0x640 [ 49.417509][ T5061] lock_acquire+0x1e3/0x630 [ 49.421993][ T5061] ? hfsplus_get_block+0x27b/0x9b0 [ 49.427089][ T5061] ? lock_release+0x810/0x810 [ 49.431748][ T5061] __mutex_lock+0x12f/0x1360 [ 49.436327][ T5061] ? hfsplus_get_block+0x27b/0x9b0 [ 49.441439][ T5061] ? hfsplus_get_block+0x27b/0x9b0 [ 49.446534][ T5061] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 49.452069][ T5061] ? find_held_lock+0x2d/0x110 [ 49.456822][ T5061] ? create_page_buffers+0x440/0x640 [ 49.462106][ T5061] ? lock_downgrade+0x6e0/0x6e0 [ 49.466937][ T5061] hfsplus_get_block+0x27b/0x9b0 [ 49.471878][ T5061] block_read_full_folio+0x35b/0x9d0 [ 49.477144][ T5061] ? hfsplus_file_extend+0xf60/0xf60 [ 49.482500][ T5061] ? create_page_buffers+0x640/0x640 [ 49.487783][ T5061] ? folio_flags.constprop.0+0x53/0x150 [ 49.493313][ T5061] ? folio_add_lru+0x37b/0x680 [ 49.498078][ T5061] ? hfsplus_bmap+0x30/0x30 [ 49.502561][ T5061] filemap_read_folio+0xdb/0x2c0 [ 49.507482][ T5061] ? __folio_lock_killable+0x20/0x20 [ 49.512747][ T5061] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 49.518280][ T5061] ? __mutex_lock+0x231/0x1360 [ 49.523056][ T5061] do_read_cache_folio+0x1df/0x510 [ 49.528162][ T5061] ? hfsplus_bmap+0x30/0x30 [ 49.532649][ T5061] read_cache_page+0x5d/0x160 [ 49.537309][ T5061] hfsplus_block_free+0x13d/0x500 [ 49.542336][ T5061] ? hfsplus_find_init+0x95/0x230 [ 49.547353][ T5061] hfsplus_free_extents+0x1ff/0x4f0 [ 49.552539][ T5061] hfsplus_file_truncate+0xe36/0x10d0 [ 49.557915][ T5061] ? hfsplus_get_block+0x9b0/0x9b0 [ 49.563027][ T5061] ? unmap_mapping_pages+0x270/0x270 [ 49.568315][ T5061] ? setattr_prepare+0x13c/0xc30 [ 49.573243][ T5061] hfsplus_setattr+0x1f2/0x320 [ 49.577988][ T5061] ? hfsplus_file_fsync+0x5b0/0x5b0 [ 49.583168][ T5061] notify_change+0xca7/0x1420 [ 49.587830][ T5061] ? do_truncate+0x143/0x200 [ 49.592405][ T5061] do_truncate+0x143/0x200 [ 49.596814][ T5061] ? file_open_root+0x430/0x430 [ 49.601671][ T5061] ? process_measurement+0x18b0/0x18b0 [ 49.607110][ T5061] ? hfsplus_getattr+0x2e0/0x2e0 [ 49.612029][ T5061] path_openat+0x2157/0x2a50 [ 49.616607][ T5061] ? path_lookupat+0x840/0x840 [ 49.621358][ T5061] do_filp_open+0x1ba/0x410 [ 49.625875][ T5061] ? may_open_dev+0xf0/0xf0 [ 49.630367][ T5061] ? find_held_lock+0x2d/0x110 [ 49.635122][ T5061] ? do_raw_spin_lock+0x124/0x2b0 [ 49.640130][ T5061] ? rwlock_bug.part.0+0x90/0x90 [ 49.645082][ T5061] ? _raw_spin_unlock+0x28/0x40 [ 49.649928][ T5061] ? alloc_fd+0x2d8/0x6d0 [ 49.654250][ T5061] do_sys_openat2+0x16d/0x4c0 [ 49.658947][ T5061] ? find_held_lock+0x2d/0x110 [ 49.663697][ T5061] ? build_open_flags+0x6f0/0x6f0 [ 49.668708][ T5061] ? ptrace_notify+0xfe/0x140 [ 49.673367][ T5061] ? lock_downgrade+0x6e0/0x6e0 [ 49.678201][ T5061] __x64_sys_creat+0xcd/0x120 [ 49.682857][ T5061] ? __x64_compat_sys_openat+0x1f0/0x1f0 [ 49.688476][ T5061] ? _raw_spin_unlock_irq+0x2e/0x50 [ 49.693659][ T5061] ? ptrace_notify+0xfe/0x140 [ 49.698315][ T5061] ? syscall_trace_enter.constprop.0+0xb0/0x250 [ 49.704538][ T5061] do_syscall_64+0x39/0xb0 [ 49.708942][ T5061] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 49.714819][ T5061] RIP: 0033:0x7f4ad95a5759 [ 49.719212][ T5061] 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 [ 49.738824][ T5061] RSP: 002b:00007fff79d771c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 49.747221][ T5061] RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007f4ad95a5759 [ 49.755172][ T5061] RDX: 00007f4ad9563dd3 RSI: 00000000000000f6 RDI: 00000000200002c0 [ 49.763125][ T5061] RBP: 00007f4ad9564ff0 R08: 00000000000005cd R09: 0000000000000000 creat("./file1", 0366) = 4 exit_group(0) = ? +++ exited with 0 +++ [ 49.7