loop0: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.17/5996 is trying to acquire lock:
ffff888030e940a0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28
but task is already holding lock:
ffff888030e940a0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&tree->tree_lock/1);
lock(&tree->tree_lock/1);
*** DEADLOCK ***
May be due to missing lock nesting notation
5 locks held by syz.0.17/5996:
#0: ffff888030e92480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
#1: ffff88802f6db058 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1032 [inline]
#1: ffff88802f6db058 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: do_truncate+0x171/0x220 fs/open.c:63
#2: ffff88802f6dadf8 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1f8/0x1c40 fs/hfsplus/extents.c:453
#3: ffff888030e940a0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28
#4: ffff88802f6d80f8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1f8/0x1c40 fs/hfsplus/extents.c:453
stack backtrace:
CPU: 0 UID: 0 PID: 5996 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041
check_deadlock kernel/locking/lockdep.c:3093 [inline]
validate_chain kernel/locking/lockdep.c:3895 [inline]
__lock_acquire+0x2540/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/rtmutex_api.c:533 [inline]
mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:552
hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28
hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline]
hfsplus_file_extend+0x40e/0x1c40 fs/hfsplus/extents.c:457
hfsplus_bmap_reserve+0x128/0x520 fs/hfsplus/btree.c:358
__hfsplus_ext_write_extent+0x2b0/0x5e0 fs/hfsplus/extents.c:104
__hfsplus_ext_cache_extent+0x9f/0xd40 fs/hfsplus/extents.c:186
hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
hfsplus_file_extend+0x437/0x1c40 fs/hfsplus/extents.c:457
hfsplus_get_block+0x40c/0x1600 fs/hfsplus/extents.c:245
__block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145
block_write_begin fs/buffer.c:2256 [inline]
cont_write_begin+0x78c/0xb50 fs/buffer.c:2594
hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48
cont_expand_zero fs/buffer.c:2522 [inline]
cont_write_begin+0x2fd/0xb50 fs/buffer.c:2584
hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48
generic_cont_expand_simple+0x13f/0x210 fs/buffer.c:2485
hfsplus_setattr+0x169/0x270 fs/hfsplus/inode.c:280
notify_change+0xc18/0xf60 fs/attr.c:546
do_truncate+0x1a4/0x220 fs/open.c:68
vfs_truncate+0x493/0x520 fs/open.c:118
do_sys_truncate+0xdb/0x190 fs/open.c:141
__do_sys_truncate fs/open.c:153 [inline]
__se_sys_truncate fs/open.c:151 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:151
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc1a7a8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff3146bf38 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007fc1a7ce5fa0 RCX: 00007fc1a7a8f749
RDX: 0000000000000000 RSI: 0000000003000000 RDI: 0000200000000900
RBP: 00007fc1a7b13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc1a7ce5fa0 R14: 00007fc1a7ce5fa0 R15: 0000000000000002
------------[ cut here ]------------
rtmutex deadlock detected
WARNING: kernel/locking/rtmutex.c:1674 at rt_mutex_handle_deadlock+0x21/0xb0 kernel/locking/rtmutex.c:1674, CPU#0: syz.0.17/5996
Modules linked in:
CPU: 0 UID: 0 PID: 5996 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rt_mutex_handle_deadlock+0x21/0xb0 kernel/locking/rtmutex.c:1674
Code: 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 41 54 53 83 ff dd 0f 85 86 00 00 00 48 89 f7 e8 a6 39 01 00 48 8d 3d 8f 4e 0a 04 <67> 48 0f b9 3a 4c 8d 3d 00 00 00 00 65 48 8b 1c 25 08 20 b3 91 4c
RSP: 0018:ffffc90003f46d30 EFLAGS: 00010286
RAX: 0000000080000000 RBX: ffffc90003f46dc0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8b3f5a40 RDI: ffffffff8ede5960
RBP: ffffc90003f46ec8 R08: ffffffff8edb3677 R09: 1ffffffff1db66ce
R10: dffffc0000000000 R11: fffffbfff1db66cf R12: 1ffff920007e8db4
R13: ffffffff8ad405b9 R14: ffff888030e94048 R15: dffffc0000000000
FS: 0000555577091500(0000) GS:ffff888126cee000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe4b74e9c0 CR3: 000000003dbbe000 CR4: 00000000003526f0
Call Trace:
__rt_mutex_slowlock kernel/locking/rtmutex.c:1734 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]
rt_mutex_slowlock+0x666/0x6b0 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:534 [inline]
mutex_lock_nested+0x16a/0x1d0 kernel/locking/rtmutex_api.c:552
hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28
hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline]
hfsplus_file_extend+0x40e/0x1c40 fs/hfsplus/extents.c:457
hfsplus_bmap_reserve+0x128/0x520 fs/hfsplus/btree.c:358
__hfsplus_ext_write_extent+0x2b0/0x5e0 fs/hfsplus/extents.c:104
__hfsplus_ext_cache_extent+0x9f/0xd40 fs/hfsplus/extents.c:186
hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
hfsplus_file_extend+0x437/0x1c40 fs/hfsplus/extents.c:457
hfsplus_get_block+0x40c/0x1600 fs/hfsplus/extents.c:245
__block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145
block_write_begin fs/buffer.c:2256 [inline]
cont_write_begin+0x78c/0xb50 fs/buffer.c:2594
hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48
cont_expand_zero fs/buffer.c:2522 [inline]
cont_write_begin+0x2fd/0xb50 fs/buffer.c:2584
hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48
generic_cont_expand_simple+0x13f/0x210 fs/buffer.c:2485
hfsplus_setattr+0x169/0x270 fs/hfsplus/inode.c:280
notify_change+0xc18/0xf60 fs/attr.c:546
do_truncate+0x1a4/0x220 fs/open.c:68
vfs_truncate+0x493/0x520 fs/open.c:118
do_sys_truncate+0xdb/0x190 fs/open.c:141
__do_sys_truncate fs/open.c:153 [inline]
__se_sys_truncate fs/open.c:151 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:151
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc1a7a8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff3146bf38 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007fc1a7ce5fa0 RCX: 00007fc1a7a8f749
RDX: 0000000000000000 RSI: 0000000003000000 RDI: 0000200000000900
RBP: 00007fc1a7b13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc1a7ce5fa0 R14: 00007fc1a7ce5fa0 R15: 0000000000000002
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 41 57 push %r15
b: 41 56 push %r14
d: 41 55 push %r13
f: 41 54 push %r12
11: 53 push %rbx
12: 83 ff dd cmp $0xffffffdd,%edi
15: 0f 85 86 00 00 00 jne 0xa1
1b: 48 89 f7 mov %rsi,%rdi
1e: e8 a6 39 01 00 call 0x139c9
23: 48 8d 3d 8f 4e 0a 04 lea 0x40a4e8f(%rip),%rdi # 0x40a4eb9
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 4c 8d 3d 00 00 00 00 lea 0x0(%rip),%r15 # 0x36
36: 65 48 8b 1c 25 08 20 mov %gs:0xffffffff91b32008,%rbx
3d: b3 91
3f: 4c rex.WR