./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3903440396 <...> forked to background, child pid 4641 no interfaces have a carrier [ 27.579146][ T4642] 8021q: adding VLAN 0 to HW filter on device bond0 [ 27.588440][ T4642] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. execve("./syz-executor3903440396", ["./syz-executor3903440396"], 0x7ffdb45fbcb0 /* 10 vars */) = 0 brk(NULL) = 0x5555568e9000 brk(0x5555568e9c40) = 0x5555568e9c40 arch_prctl(ARCH_SET_FS, 0x5555568e9300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor3903440396", 4096) = 28 brk(0x55555690ac40) = 0x55555690ac40 brk(0x55555690b000) = 0x55555690b000 mprotect(0x7f1b1622e000, 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) = 0x7f1b0dd75000 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(0x7f1b0dd75000, 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: [ 52.724003][ T5069] loop0: detected capacity change from 0 to 1024 [ 52.751949][ T5069] hfsplus: xattr searching failed [ 52.757855][ T5069] [ 52.760184][ T5069] ============================================ [ 52.766322][ T5069] WARNING: possible recursive locking detected [ 52.772447][ T5069] 6.1.0-syzkaller-14446-g8395ae05cb5a #0 Not tainted [ 52.779090][ T5069] -------------------------------------------- [ 52.785214][ T5069] syz-executor390/5069 is trying to acquire lock: [ 52.791599][ T5069] ffff888017401548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x27b/0x9b0 [ 52.802379][ T5069] [ 52.802379][ T5069] but task is already holding lock: [ 52.809718][ T5069] ffff88802a988108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 52.820910][ T5069] [ 52.820910][ T5069] other info that might help us debug this: [ 52.828939][ T5069] Possible unsafe locking scenario: [ 52.828939][ T5069] [ 52.836360][ T5069] CPU0 [ 52.839622][ T5069] ---- [ 52.842881][ T5069] lock(&HFSPLUS_I(inode)->extents_lock); [ 52.848661][ T5069] lock(&HFSPLUS_I(inode)->extents_lock); [ 52.854444][ T5069] [ 52.854444][ T5069] *** DEADLOCK *** [ 52.854444][ T5069] [ 52.862563][ T5069] May be due to missing lock nesting notation [ 52.862563][ T5069] [ 52.870853][ T5069] 4 locks held by syz-executor390/5069: [ 52.876382][ T5069] #0: ffff88802684e460 (sb_writers#9){.+.+}-{0:0}, at: path_openat+0x19b3/0x2a50 [ 52.885586][ T5069] #1: ffff88802a988300 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: do_truncate+0x131/0x200 [ 52.895920][ T5069] #2: ffff88802a988108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 52.907549][ T5069] #3: ffff88802af900f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xdd/0x500 [ 52.917534][ T5069] [ 52.917534][ T5069] stack backtrace: [ 52.923395][ T5069] CPU: 1 PID: 5069 Comm: syz-executor390 Not tainted 6.1.0-syzkaller-14446-g8395ae05cb5a #0 [ 52.933433][ T5069] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 52.943464][ T5069] Call Trace: [ 52.946722][ T5069] [ 52.949637][ T5069] dump_stack_lvl+0xd1/0x138 [ 52.954209][ T5069] __lock_acquire.cold+0x116/0x3a7 [ 52.959315][ T5069] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 52.965276][ T5069] ? save_trace+0x43/0xad0 [ 52.969677][ T5069] ? create_page_buffers+0x440/0x640 [ 52.974942][ T5069] lock_acquire+0x1e3/0x630 [ 52.979418][ T5069] ? hfsplus_get_block+0x27b/0x9b0 [ 52.984516][ T5069] ? lock_release+0x810/0x810 [ 52.989170][ T5069] __mutex_lock+0x12f/0x1360 [ 52.993744][ T5069] ? hfsplus_get_block+0x27b/0x9b0 [ 52.998833][ T5069] ? hfsplus_get_block+0x27b/0x9b0 [ 53.003925][ T5069] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 53.009453][ T5069] ? find_held_lock+0x2d/0x110 [ 53.014198][ T5069] ? create_page_buffers+0x440/0x640 [ 53.019460][ T5069] ? lock_downgrade+0x6e0/0x6e0 [ 53.024288][ T5069] hfsplus_get_block+0x27b/0x9b0 [ 53.029206][ T5069] block_read_full_folio+0x35b/0x9d0 [ 53.034470][ T5069] ? hfsplus_file_extend+0xf60/0xf60 [ 53.039740][ T5069] ? create_page_buffers+0x640/0x640 [ 53.045001][ T5069] ? folio_flags.constprop.0+0x53/0x150 [ 53.050617][ T5069] ? folio_add_lru+0x37b/0x680 [ 53.055359][ T5069] ? hfsplus_bmap+0x30/0x30 [ 53.059844][ T5069] filemap_read_folio+0xdb/0x2c0 [ 53.064824][ T5069] ? __folio_lock_killable+0x20/0x20 [ 53.070087][ T5069] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 53.075615][ T5069] ? __mutex_lock+0x231/0x1360 [ 53.080361][ T5069] do_read_cache_folio+0x1df/0x510 [ 53.085453][ T5069] ? hfsplus_bmap+0x30/0x30 [ 53.089937][ T5069] read_cache_page+0x5d/0x160 [ 53.094595][ T5069] hfsplus_block_free+0x13d/0x500 [ 53.099607][ T5069] ? hfsplus_find_init+0x95/0x230 [ 53.104716][ T5069] hfsplus_free_extents+0x1ff/0x4f0 [ 53.109899][ T5069] hfsplus_file_truncate+0xe36/0x10d0 [ 53.115253][ T5069] ? hfsplus_get_block+0x9b0/0x9b0 [ 53.120345][ T5069] ? unmap_mapping_pages+0x270/0x270 [ 53.125611][ T5069] ? setattr_prepare+0x13c/0xc30 [ 53.130534][ T5069] hfsplus_setattr+0x1f2/0x320 [ 53.135292][ T5069] ? hfsplus_file_fsync+0x5b0/0x5b0 [ 53.140472][ T5069] notify_change+0xca7/0x1420 [ 53.145151][ T5069] ? do_truncate+0x143/0x200 [ 53.149722][ T5069] do_truncate+0x143/0x200 [ 53.154119][ T5069] ? file_open_root+0x430/0x430 [ 53.158952][ T5069] ? process_measurement+0x18b0/0x18b0 [ 53.164391][ T5069] ? hfsplus_getattr+0x2e0/0x2e0 [ 53.169317][ T5069] path_openat+0x2157/0x2a50 [ 53.173903][ T5069] ? path_lookupat+0x840/0x840 [ 53.178652][ T5069] do_filp_open+0x1ba/0x410 [ 53.183137][ T5069] ? may_open_dev+0xf0/0xf0 [ 53.187621][ T5069] ? find_held_lock+0x2d/0x110 [ 53.192368][ T5069] ? do_raw_spin_lock+0x124/0x2b0 [ 53.197369][ T5069] ? rwlock_bug.part.0+0x90/0x90 [ 53.202287][ T5069] ? _raw_spin_unlock+0x28/0x40 [ 53.207116][ T5069] ? alloc_fd+0x2d8/0x6d0 [ 53.211423][ T5069] do_sys_openat2+0x16d/0x4c0 [ 53.216078][ T5069] ? find_held_lock+0x2d/0x110 [ 53.220824][ T5069] ? build_open_flags+0x6f0/0x6f0 [ 53.225825][ T5069] ? ptrace_notify+0xfe/0x140 [ 53.230567][ T5069] ? lock_downgrade+0x6e0/0x6e0 [ 53.235394][ T5069] __x64_sys_creat+0xcd/0x120 [ 53.240048][ T5069] ? __x64_compat_sys_openat+0x1f0/0x1f0 [ 53.245656][ T5069] ? _raw_spin_unlock_irq+0x2e/0x50 [ 53.250853][ T5069] ? ptrace_notify+0xfe/0x140 [ 53.255596][ T5069] ? syscall_trace_enter.constprop.0+0xb0/0x250 [ 53.261816][ T5069] do_syscall_64+0x39/0xb0 [ 53.266216][ T5069] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 53.272088][ T5069] RIP: 0033:0x7f1b161c1759 creat("./file1", 054) = 4 exit_group(0) = ? +++ exited with 0 +++ [ 53.276479][ T5069] 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 [ 53.296328][ T5069] RSP: 002b:00007fffe2aaa2e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 53.304718][ T5069] RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007f1b161c1759 [ 53.312671][ T5069] RDX: 00007f1b1617fdd3 RSI: 000000000000002c RDI: 0000000020000000 [ 53.320620][ T5069] RBP: 00007f1b16180ff0 R08: 00000000000005cd R09: