./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor758266242 <...> Warning: Permanently added '10.128.0.45' (ED25519) to the list of known hosts. execve("./syz-executor758266242", ["./syz-executor758266242"], 0x7ffcb32da300 /* 10 vars */) = 0 brk(NULL) = 0x55556e4d4000 brk(0x55556e4d4d00) = 0x55556e4d4d00 arch_prctl(ARCH_SET_FS, 0x55556e4d4380) = 0 set_tid_address(0x55556e4d4650) = 5826 set_robust_list(0x55556e4d4660, 24) = 0 rseq(0x55556e4d4ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor758266242", 4096) = 27 getrandom("\x69\x01\xd0\x12\x15\x6d\x5f\xf3", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556e4d4d00 brk(0x55556e4f5d00) = 0x55556e4f5d00 brk(0x55556e4f6000) = 0x55556e4f6000 mprotect(0x7f445800c000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 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 5827 attached [pid 5827] set_robust_list(0x55556e4d4660, 24) = 0 [pid 5826] <... clone resumed>, child_tidptr=0x55556e4d4650) = 5827 [pid 5827] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5827] setpgid(0, 0) = 0 [pid 5827] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "1000", 4) = 4 [pid 5827] close(3) = 0 executing program [pid 5827] write(1, "executing program\n", 18) = 18 [pid 5827] memfd_create("syzkaller", 0) = 3 [pid 5827] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f444fa00000 [pid 5827] 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 5827] munmap(0x7f444fa00000, 138412032) = 0 [pid 5827] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5827] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5827] close(3) = 0 [pid 5827] close(4) = 0 [pid 5827] mkdir("./bus", 0777) = 0 [ 78.203049][ T5827] loop0: detected capacity change from 0 to 1024 [pid 5827] mount("/dev/loop0", "./bus", "hfsplus", MS_RELATIME, "") = 0 [pid 5827] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 3 [pid 5827] chdir("./bus") = 0 [pid 5827] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [pid 5827] open("./bus", O_RDWR|O_CREAT|O_NOCTTY|O_SYNC|O_DIRECT|O_NOATIME, 000) = 4 [ 78.272233][ T31] audit: type=1800 audit(1742544766.343:2): pid=5827 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="syz-executor758" name="bus" dev="loop0" ino=26 res=0 errno=0 [ 78.286761][ T5827] [ 78.294323][ T5827] ============================================ [ 78.300456][ T5827] WARNING: possible recursive locking detected [ 78.306603][ T5827] 6.14.0-rc7-syzkaller-00137-g5fc319360819 #0 Not tainted [ 78.313700][ T5827] -------------------------------------------- [ 78.319832][ T5827] syz-executor758/5827 is trying to acquire lock: [ 78.326233][ T5827] ffff88807c8ca0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 [ 78.335944][ T5827] [ 78.335944][ T5827] but task is already holding lock: [ 78.343303][ T5827] ffff88807c8ca0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 [ 78.352971][ T5827] [ 78.352971][ T5827] other info that might help us debug this: [ 78.361021][ T5827] Possible unsafe locking scenario: [ 78.361021][ T5827] [ 78.368460][ T5827] CPU0 [ 78.371734][ T5827] ---- [ 78.375015][ T5827] lock(&tree->tree_lock/1); [ 78.379701][ T5827] lock(&tree->tree_lock/1); [ 78.384379][ T5827] [ 78.384379][ T5827] *** DEADLOCK *** [ 78.384379][ T5827] [ 78.392527][ T5827] May be due to missing lock nesting notation [ 78.392527][ T5827] [ 78.400839][ T5827] 5 locks held by syz-executor758/5827: [ 78.406377][ T5827] #0: ffff88802405e420 (sb_writers#9){.+.+}-{0:0}, at: do_ftruncate+0x44f/0x540 [ 78.415533][ T5827] #1: ffff88807cc41df8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: do_truncate+0x20c/0x310 [ 78.425911][ T5827] #2: ffff88807cc41c08 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 [ 78.436284][ T5827] #3: ffff88807c8ca0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 [ 78.446384][ T5827] #4: ffff888035828108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 [ 78.457904][ T5827] [ 78.457904][ T5827] stack backtrace: [ 78.463795][ T5827] CPU: 1 UID: 0 PID: 5827 Comm: syz-executor758 Not tainted 6.14.0-rc7-syzkaller-00137-g5fc319360819 #0 [ 78.463814][ T5827] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 78.463827][ T5827] Call Trace: [ 78.463835][ T5827] [ 78.463842][ T5827] dump_stack_lvl+0x241/0x360 [ 78.463861][ T5827] ? __pfx_dump_stack_lvl+0x10/0x10 [ 78.463876][ T5827] ? __pfx__printk+0x10/0x10 [ 78.463899][ T5827] ? lockdep_unlock+0x16a/0x300 [ 78.463923][ T5827] print_deadlock_bug+0x483/0x620 [ 78.463940][ T5827] validate_chain+0x15e2/0x5920 [ 78.463960][ T5827] ? mark_lock+0x9a/0x360 [ 78.463985][ T5827] ? __lock_acquire+0x1397/0x2100 [ 78.464006][ T5827] ? __pfx_validate_chain+0x10/0x10 [ 78.464030][ T5827] ? mark_lock+0x9a/0x360 [ 78.464053][ T5827] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 78.464076][ T5827] ? mark_lock+0x9a/0x360 [ 78.464099][ T5827] __lock_acquire+0x1397/0x2100 [ 78.464126][ T5827] lock_acquire+0x1ed/0x550 [ 78.464147][ T5827] ? hfsplus_find_init+0x14a/0x1c0 [ 78.464167][ T5827] ? __pfx_lock_acquire+0x10/0x10 [ 78.464187][ T5827] ? hfsplus_find_init+0x85/0x1c0 [ 78.464203][ T5827] ? hfsplus_file_extend+0x454/0x1b70 [ 78.464225][ T5827] ? __pfx___might_resched+0x10/0x10 [ 78.464248][ T5827] ? hfsplus_get_block+0x406/0x14f0 [ 78.464269][ T5827] ? __block_write_begin_int+0x692/0x19a0 [ 78.464286][ T5827] ? cont_write_begin+0x77f/0xb40 [ 78.464303][ T5827] ? hfsplus_write_begin+0x68/0xb0 [ 78.464322][ T5827] ? cont_write_begin+0x32b/0xb40 [ 78.464338][ T5827] ? hfsplus_write_begin+0x68/0xb0 [ 78.464357][ T5827] ? generic_cont_expand_simple+0x18f/0x2b0 [ 78.464374][ T5827] ? hfsplus_setattr+0x16d/0x270 [ 78.464394][ T5827] ? notify_change+0xbca/0xe90 [ 78.464415][ T5827] ? do_ftruncate+0x4a1/0x540 [ 78.464435][ T5827] ? __x64_sys_ftruncate+0x94/0xf0 [ 78.464454][ T5827] ? do_syscall_64+0xf3/0x230 [ 78.464485][ T5827] __mutex_lock+0x19c/0x1010 [ 78.464508][ T5827] ? hfsplus_find_init+0x14a/0x1c0 [ 78.464529][ T5827] ? hfsplus_find_init+0x14a/0x1c0 [ 78.464546][ T5827] ? __pfx___mutex_lock+0x10/0x10 [ 78.464572][ T5827] ? rcu_is_watching+0x15/0xb0 [ 78.464588][ T5827] ? __kmalloc_noprof+0x2a5/0x4c0 [ 78.464603][ T5827] ? hfsplus_find_init+0x85/0x1c0 [ 78.464621][ T5827] hfsplus_find_init+0x14a/0x1c0 [ 78.464639][ T5827] hfsplus_file_extend+0x454/0x1b70 [ 78.464665][ T5827] ? __pfx_hfsplus_file_extend+0x10/0x10 [ 78.464689][ T5827] ? __pfx___mutex_trylock_common+0x10/0x10 [ 78.464704][ T5827] ? do_syscall_64+0xf3/0x230 [ 78.464730][ T5827] ? trace_contention_end+0x3c/0x120 [ 78.464746][ T5827] ? __mutex_lock+0x397/0x1010 [ 78.464769][ T5827] ? hfsplus_brec_find+0x19d/0x570 [ 78.464789][ T5827] hfsplus_bmap_reserve+0x105/0x4e0 [ 78.464813][ T5827] __hfsplus_ext_write_extent+0x2a4/0x5c0 [ 78.464838][ T5827] __hfsplus_ext_cache_extent+0x84/0xe10 [ 78.464864][ T5827] hfsplus_file_extend+0x48c/0x1b70 [ 78.464920][ T5827] ? __pfx_hfsplus_file_extend+0x10/0x10 [ 78.464946][ T5827] ? clean_bdev_aliases+0x6f8/0x890 [ 78.464965][ T5827] ? __pfx_clean_bdev_aliases+0x10/0x10 [ 78.464985][ T5827] hfsplus_get_block+0x406/0x14f0 [ 78.465012][ T5827] ? __pfx_hfsplus_get_block+0x10/0x10 [ 78.465037][ T5827] ? _raw_spin_unlock+0x28/0x50 [ 78.465057][ T5827] ? create_empty_buffers+0x471/0x530 [ 78.465075][ T5827] __block_write_begin_int+0x692/0x19a0 [ 78.465094][ T5827] ? __pfx_filemap_alloc_folio_noprof+0x10/0x10 [ 78.465120][ T5827] ? __pfx_hfsplus_get_block+0x10/0x10 [ 78.465143][ T5827] ? __pfx___block_write_begin_int+0x10/0x10 [ 78.465164][ T5827] cont_write_begin+0x77f/0xb40 [ 78.465187][ T5827] ? __pfx_cont_write_begin+0x10/0x10 [ 78.465205][ T5827] ? rcu_is_watching+0x15/0xb0 [ 78.465221][ T5827] ? __mark_inode_dirty+0x3db/0xe90 [ 78.465246][ T5827] hfsplus_write_begin+0x68/0xb0 [ 78.465266][ T5827] ? __pfx_hfsplus_get_block+0x10/0x10 [ 78.465289][ T5827] cont_write_begin+0x32b/0xb40 [ 78.465313][ T5827] ? __pfx_cont_write_begin+0x10/0x10 [ 78.465335][ T5827] hfsplus_write_begin+0x68/0xb0 [ 78.465354][ T5827] ? __pfx_hfsplus_get_block+0x10/0x10 [ 78.465378][ T5827] generic_cont_expand_simple+0x18f/0x2b0 [ 78.465398][ T5827] ? __pfx_generic_cont_expand_simple+0x10/0x10 [ 78.465417][ T5827] ? current_time+0x29b/0x3a0 [ 78.465439][ T5827] hfsplus_setattr+0x16d/0x270 [ 78.465461][ T5827] ? __pfx_hfsplus_setattr+0x10/0x10 [ 78.465483][ T5827] notify_change+0xbca/0xe90 [ 78.465510][ T5827] do_truncate+0x220/0x310 [ 78.465530][ T5827] ? __pfx_do_truncate+0x10/0x10 [ 78.465553][ T5827] ? _raw_spin_unlock_irq+0x23/0x50 [ 78.465577][ T5827] do_ftruncate+0x4a1/0x540 [ 78.465599][ T5827] ? __pfx_do_ftruncate+0x10/0x10 [ 78.465620][ T5827] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 78.465646][ T5827] __x64_sys_ftruncate+0x94/0xf0 [ 78.465668][ T5827] do_syscall_64+0xf3/0x230 [ 78.465692][ T5827] ? clear_bhb_loop+0x35/0x90 [ 78.465717][ T5827] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.465746][ T5827] RIP: 0033:0x7f4457f98ad9 [ 78.465763][ T5827] 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 [ 78.465777][ T5827] RSP: 002b:00007ffeab589048 EFLAGS: 00000246 ORIG_RAX: 000000000000004d [ 78.465793][ T5827] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4457f98ad9 [ 78.465805][ T5827] RDX: 00007f4457f98ad9 RSI: 0000000002007ffb RDI: 0000000000000004 [ 78.465815][ T5827] RBP: 00007f445800c5f0 R08: 000055556e4d54c0 R09: 000055556e4d54c0 [ 78.465827][ T5827] R10: 0000000000000703 R11: 0000000000000246 R12: 00007ffeab589070 [ 78.465837][ T5827] R13: 00007ffeab589298 R14: 431bde82d7b634db R15: 00007f4457fe103b [ 78.465855][ T5827] [pid 5827] ftruncate(4, 33587195 [pid 5826] kill(-5827, SIGKILL) = 0 [pid 5826] kill(5827, SIGKILL) = 0 [pid 5826] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5826] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5826] getdents64(3, 0x55556e4d56f0 /* 2 entries */, 32768) = 48 [pid 5826] getdents64(3, 0x55556e4d56f0 /* 0 entries */, 32768) = 0 [pid 5826] close(3) = 0 [ 86.903427][ T976] cfg80211: failed to load regulatory.db