./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2509336345 <...> Warning: Permanently added '10.128.1.122' (ED25519) to the list of known hosts. execve("./syz-executor2509336345", ["./syz-executor2509336345"], 0x7ffe5070d4a0 /* 10 vars */) = 0 brk(NULL) = 0x55555f179000 brk(0x55555f179d00) = 0x55555f179d00 arch_prctl(ARCH_SET_FS, 0x55555f179380) = 0 set_tid_address(0x55555f179650) = 5822 set_robust_list(0x55555f179660, 24) = 0 rseq(0x55555f179ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2509336345", 4096) = 28 getrandom("\xa6\x48\xf7\x27\x1a\x60\x9c\xde", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555f179d00 brk(0x55555f19ad00) = 0x55555f19ad00 brk(0x55555f19b000) = 0x55555f19b000 mprotect(0x7f62bb84f000, 16384, PROT_READ) = 0 mmap(0x3ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3ffffffff000 mmap(0x400000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400000000000 mmap(0x400001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400001000000 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = -1 ENXIO (No such device or address) close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5823 attached [pid 5823] set_robust_list(0x55555f179660, 24 [pid 5822] <... clone resumed>, child_tidptr=0x55555f179650) = 5823 [pid 5823] <... set_robust_list resumed>) = 0 [pid 5823] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5823] setpgid(0, 0) = 0 [pid 5823] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5823] write(3, "1000", 4) = 4 [pid 5823] close(3) = 0 executing program [pid 5823] write(1, "executing program\n", 18) = 18 [pid 5823] memfd_create("syzkaller", 0) = 3 [pid 5823] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f62b3200000 [pid 5823] 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 [pid 5823] munmap(0x7f62b3200000, 138412032) = 0 [pid 5823] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5823] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5823] close(3) = 0 [pid 5823] close(4) = 0 [pid 5823] mkdir("./bus", 0777) = 0 [pid 5823] mount("/dev/loop0", "./bus", "hfsplus", MS_RELATIME, "") = 0 [pid 5823] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 3 [pid 5823] chdir("./bus") = 0 [ 76.169000][ T5823] loop0: detected capacity change from 0 to 1024 [pid 5823] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [pid 5823] creat("./bus", 0261) = 4 [ 76.235845][ T5823] [ 76.238200][ T5823] ============================================ [ 76.244358][ T5823] WARNING: possible recursive locking detected [ 76.250521][ T5823] 6.14.0-rc4-syzkaller-00090-gdd83757f6e68 #0 Not tainted [ 76.257614][ T5823] -------------------------------------------- [ 76.263751][ T5823] syz-executor250/5823 is trying to acquire lock: [ 76.270152][ T5823] ffff888079dfe0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 [ 76.279844][ T5823] [ 76.279844][ T5823] but task is already holding lock: [ 76.287201][ T5823] ffff888079dfe0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 [ 76.296907][ T5823] [ 76.296907][ T5823] other info that might help us debug this: [ 76.304976][ T5823] Possible unsafe locking scenario: [ 76.304976][ T5823] [ 76.312442][ T5823] CPU0 [ 76.315727][ T5823] ---- [ 76.319001][ T5823] lock(&tree->tree_lock/1); [ 76.323692][ T5823] lock(&tree->tree_lock/1); [ 76.328380][ T5823] [ 76.328380][ T5823] *** DEADLOCK *** [ 76.328380][ T5823] [ 76.336519][ T5823] May be due to missing lock nesting notation [ 76.336519][ T5823] [ 76.344845][ T5823] 5 locks held by syz-executor250/5823: [ 76.350401][ T5823] #0: ffff888079dfc420 (sb_writers#9){.+.+}-{0:0}, at: vfs_write+0x225/0xd10 [ 76.359327][ T5823] #1: ffff88802dc724b8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: generic_file_write_iter+0xe0/0x5e0 [ 76.370696][ T5823] #2: ffff88802dc722c8 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 [ 76.381087][ T5823] #3: ffff888079dfe0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 [ 76.391235][ T5823] #4: ffff88807b018108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 [ 76.402846][ T5823] [ 76.402846][ T5823] stack backtrace: [ 76.408760][ T5823] CPU: 0 UID: 0 PID: 5823 Comm: syz-executor250 Not tainted 6.14.0-rc4-syzkaller-00090-gdd83757f6e68 #0 [ 76.408780][ T5823] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 76.408795][ T5823] Call Trace: [ 76.408807][ T5823] [ 76.408814][ T5823] dump_stack_lvl+0x241/0x360 [ 76.408836][ T5823] ? __pfx_dump_stack_lvl+0x10/0x10 [ 76.408852][ T5823] ? __pfx__printk+0x10/0x10 [ 76.408876][ T5823] ? lockdep_unlock+0x16a/0x300 [ 76.408901][ T5823] print_deadlock_bug+0x483/0x620 [ 76.408921][ T5823] validate_chain+0x15e2/0x5920 [ 76.408942][ T5823] ? mark_lock+0x9a/0x360 [ 76.408967][ T5823] ? __lock_acquire+0x1397/0x2100 [ 76.408989][ T5823] ? __pfx_validate_chain+0x10/0x10 [ 76.409013][ T5823] ? mark_lock+0x9a/0x360 [ 76.409038][ T5823] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 76.409062][ T5823] ? mark_lock+0x9a/0x360 [ 76.409087][ T5823] __lock_acquire+0x1397/0x2100 [ 76.409115][ T5823] lock_acquire+0x1ed/0x550 [ 76.409137][ T5823] ? hfsplus_find_init+0x14a/0x1c0 [ 76.409165][ T5823] ? __pfx_lock_acquire+0x10/0x10 [ 76.409187][ T5823] ? hfsplus_find_init+0x85/0x1c0 [ 76.409203][ T5823] ? hfsplus_file_extend+0x454/0x1b70 [ 76.409226][ T5823] ? __pfx___might_resched+0x10/0x10 [ 76.409245][ T5823] ? hfsplus_get_block+0x406/0x14f0 [ 76.409267][ T5823] ? __block_write_begin_int+0x692/0x19a0 [ 76.409284][ T5823] ? cont_write_begin+0x77f/0xb40 [ 76.409301][ T5823] ? hfsplus_write_begin+0x68/0xb0 [ 76.409320][ T5823] ? generic_perform_write+0x346/0x990 [ 76.409346][ T5823] ? generic_file_write_iter+0x10c/0x5e0 [ 76.409371][ T5823] ? vfs_write+0xacf/0xd10 [ 76.409389][ T5823] ? ksys_write+0x18f/0x2b0 [ 76.409407][ T5823] ? do_syscall_64+0xf3/0x230 [ 76.409438][ T5823] __mutex_lock+0x19c/0x1010 [ 76.409459][ T5823] ? hfsplus_find_init+0x14a/0x1c0 [ 76.409479][ T5823] ? hfsplus_find_init+0x14a/0x1c0 [ 76.409497][ T5823] ? __pfx___mutex_lock+0x10/0x10 [ 76.409521][ T5823] ? rcu_is_watching+0x15/0xb0 [ 76.409537][ T5823] ? __kmalloc_noprof+0x2a5/0x4c0 [ 76.409553][ T5823] ? hfsplus_find_init+0x85/0x1c0 [ 76.409572][ T5823] hfsplus_find_init+0x14a/0x1c0 [ 76.409590][ T5823] hfsplus_file_extend+0x454/0x1b70 [ 76.409617][ T5823] ? __pfx_hfsplus_file_extend+0x10/0x10 [ 76.409641][ T5823] ? __pfx___mutex_trylock_common+0x10/0x10 [ 76.409661][ T5823] ? trace_contention_end+0x3c/0x120 [ 76.409677][ T5823] ? __mutex_lock+0x397/0x1010 [ 76.409698][ T5823] ? hfsplus_brec_find+0x19d/0x570 [ 76.409718][ T5823] hfsplus_bmap_reserve+0x105/0x4e0 [ 76.409748][ T5823] __hfsplus_ext_write_extent+0x2a4/0x5c0 [ 76.409775][ T5823] __hfsplus_ext_cache_extent+0x84/0xe10 [ 76.409801][ T5823] hfsplus_file_extend+0x48c/0x1b70 [ 76.409828][ T5823] ? __pfx_hfsplus_file_extend+0x10/0x10 [ 76.409854][ T5823] ? clean_bdev_aliases+0x709/0x890 [ 76.409873][ T5823] ? __pfx_clean_bdev_aliases+0x10/0x10 [ 76.409892][ T5823] hfsplus_get_block+0x406/0x14f0 [ 76.409920][ T5823] ? __pfx_hfsplus_get_block+0x10/0x10 [ 76.409944][ T5823] ? _raw_spin_unlock+0x28/0x50 [ 76.409961][ T5823] ? create_empty_buffers+0x471/0x530 [ 76.409980][ T5823] __block_write_begin_int+0x692/0x19a0 [ 76.409998][ T5823] ? __pfx_filemap_alloc_folio_noprof+0x10/0x10 [ 76.410024][ T5823] ? __pfx_hfsplus_get_block+0x10/0x10 [ 76.410046][ T5823] ? __pfx___block_write_begin_int+0x10/0x10 [ 76.410067][ T5823] cont_write_begin+0x77f/0xb40 [ 76.410089][ T5823] ? __pfx_cont_write_begin+0x10/0x10 [ 76.410107][ T5823] ? __pfx_fault_in_readable+0x10/0x10 [ 76.410127][ T5823] ? __mark_inode_dirty+0x3db/0xe90 [ 76.410147][ T5823] hfsplus_write_begin+0x68/0xb0 [ 76.410173][ T5823] ? __pfx_hfsplus_get_block+0x10/0x10 [ 76.410196][ T5823] generic_perform_write+0x346/0x990 [ 76.410227][ T5823] ? __pfx_generic_perform_write+0x10/0x10 [ 76.410253][ T5823] ? file_update_time+0x2ab/0x450 [ 76.410275][ T5823] ? __generic_file_write_iter+0x102/0x230 [ 76.410302][ T5823] generic_file_write_iter+0x10c/0x5e0 [ 76.410329][ T5823] ? __pfx_generic_file_write_iter+0x10/0x10 [ 76.410361][ T5823] ? __pfx_lock_acquire+0x10/0x10 [ 76.410387][ T5823] ? rcu_read_lock_any_held+0xb7/0x160 [ 76.410405][ T5823] ? __pfx_rcu_read_lock_any_held+0x10/0x10 [ 76.410427][ T5823] vfs_write+0xacf/0xd10 [ 76.410448][ T5823] ? __pfx_generic_file_write_iter+0x10/0x10 [ 76.410474][ T5823] ? __pfx_vfs_write+0x10/0x10 [ 76.410495][ T5823] ? _raw_spin_unlock_irq+0x23/0x50 [ 76.410512][ T5823] ? lockdep_hardirqs_on+0x99/0x150 [ 76.410533][ T5823] ? ptrace_notify+0x27f/0x380 [ 76.410552][ T5823] ksys_write+0x18f/0x2b0 [ 76.410573][ T5823] ? __pfx_ksys_write+0x10/0x10 [ 76.410593][ T5823] ? exc_page_fault+0x590/0x8b0 [ 76.410615][ T5823] do_syscall_64+0xf3/0x230 [ 76.410637][ T5823] ? clear_bhb_loop+0x35/0x90 [ 76.410662][ T5823] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.410686][ T5823] RIP: 0033:0x7f62bb7dbad9 [ 76.410704][ T5823] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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 [ 76.410717][ T5823] RSP: 002b:00007ffd6bf48498 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 76.410735][ T5823] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f62bb7dbad9 [ 76.410746][ T5823] RDX: 00000000175d9003 RSI: 0000400000000200 RDI: 0000000000000004 [ 76.410757][ T5823] RBP: 00007f62bb84f5f0 R08: 000055555f17a4c0 R09: 000055555f17a4c0 [ 76.410769][ T5823] R10: 0000000000000702 R11: 0000000000000246 R12: 00007ffd6bf484c0 [ 76.410779][ T5823] R13: 00007ffd6bf486e8 R14: 431bde82d7b634db R15: 00007f62bb82403b [ 76.410796][ T5823] [pid 5823] write(4, "\x74\x68\x72\x65\x61\x64\x65\x64\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 392007683 [pid 5822] kill(-5823, SIGKILL) = 0 [pid 5822] kill(5823, SIGKILL) = 0 [pid 5822] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5822] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5822] getdents64(3, 0x55555f17a6f0 /* 2 entries */, 32768) = 48 [pid 5822] getdents64(3, 0x55555f17a6f0 /* 0 entries */, 32768) = 0 [pid 5822] close(3) = 0