============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.7.252/8001 is trying to acquire lock:
ffff888036c140a0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1
but task is already holding lock:
ffff888036c140a0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1
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.7.252/8001:
#0: ffff88805b212480 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff88805fa95000 (&sb->s_type->i_mutex_key#40){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1034 [inline]
#1: ffff88805fa95000 (&sb->s_type->i_mutex_key#40){+.+.}-{4:4}, at: do_truncate+0x18f/0x250 fs/open.c:63
#2: ffff88805fa94e28 (&HFS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397
#3: ffff888036c140a0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1
#4: ffff8880297de328 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397
stack backtrace:
CPU: 0 UID: 0 PID: 8001 Comm: syz.7.252 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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+0x253f/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/rtmutex_api.c:534 [inline]
mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:553
hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1
hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
hfs_extend_file+0x35c/0x15e0 fs/hfs/extent.c:401
hfs_bmap_reserve+0x107/0x430 fs/hfs/btree.c:269
__hfs_ext_write_extent+0x1fa/0x470 fs/hfs/extent.c:121
__hfs_ext_cache_extent+0x6b/0x9b0 fs/hfs/extent.c:174
hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
hfs_extend_file+0x39b/0x15e0 fs/hfs/extent.c:401
hfs_get_block+0x412/0xc50 fs/hfs/extent.c:353
__block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2042
block_write_begin fs/buffer.c:2153 [inline]
cont_write_begin+0x737/0xae0 fs/buffer.c:2491
hfs_write_begin+0x66/0xb0 fs/hfs/inode.c:53
cont_expand_zero fs/buffer.c:2419 [inline]
cont_write_begin+0x2e7/0xae0 fs/buffer.c:2481
hfs_write_begin+0x66/0xb0 fs/hfs/inode.c:53
hfs_file_truncate+0x1cf/0xb70 fs/hfs/extent.c:495
hfs_inode_setattr+0x4a9/0x670 fs/hfs/inode.c:667
notify_change+0xc18/0xf60 fs/attr.c:556
do_truncate+0x1c2/0x250 fs/open.c:68
vfs_truncate+0x4b7/0x540 fs/open.c:118
ksys_truncate+0xf3/0x1c0 fs/open.c:142
__do_sys_truncate fs/open.c:154 [inline]
__se_sys_truncate fs/open.c:152 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:152
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98f8d1cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f98f6f76028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f98f8f95fa0 RCX: 00007f98f8d1cdd9
RDX: 0000000000000000 RSI: 0000000002fffffd RDI: 0000200000000940
RBP: 00007f98f8db2d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98f8f96038 R14: 00007f98f8f95fa0 R15: 00007ffca72267c8
Oops: general protection fault, probably for non-canonical address 0xdffffc000000015b: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000ad8-0x0000000000000adf]
CPU: 0 UID: 0 PID: 8001 Comm: syz.7.252 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
RIP: 0010:do_raw_spin_lock+0x73/0x2f0 kernel/locking/spinlock_debug.c:115
Code: c7 44 24 30 c0 f6 a0 81 4c 8d 64 24 20 49 c1 ec 03 48 b8 f1 f1 f1 f1 f8 f3 f3 f3 49 89 04 14 4c 8d 77 04 4c 89 f0 48 c1 e8 03 <0f> b6 04 10 84 c0 0f 85 f3 01 00 00 41 8b 06 3d ad 4e ad de 0f 85
RSP: 0018:ffffc90004dbeb20 EFLAGS: 00010003
RAX: 000000000000015b RBX: 0000000000000ad8 RCX: 0000000080000003
RDX: dffffc0000000000 RSI: ffffffff8ba74ec0 RDI: 0000000000000ad8
RBP: ffffc90004dbebe0 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f11cdf R12: 1ffff920009b7d68
R13: ffffc90004dbece0 R14: 0000000000000adc R15: 0000000000000ad8
FS: 00007f98f6f766c0(0000) GS:ffff888126176000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70469f5000 CR3: 000000003b3da000 CR4: 00000000003526f0
Call Trace:
class_raw_spinlock_constructor include/linux/spinlock.h:535 [inline]
remove_waiter+0x138/0xb10 kernel/locking/rtmutex.c:1561
__rt_mutex_slowlock kernel/locking/rtmutex.c:1751 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1779 [inline]
rt_mutex_slowlock+0x72d/0x780 kernel/locking/rtmutex.c:1819
__rt_mutex_lock kernel/locking/rtmutex.c:1834 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:535 [inline]
mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:553
hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1
hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
hfs_extend_file+0x35c/0x15e0 fs/hfs/extent.c:401
hfs_bmap_reserve+0x107/0x430 fs/hfs/btree.c:269
__hfs_ext_write_extent+0x1fa/0x470 fs/hfs/extent.c:121
__hfs_ext_cache_extent+0x6b/0x9b0 fs/hfs/extent.c:174
hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
hfs_extend_file+0x39b/0x15e0 fs/hfs/extent.c:401
hfs_get_block+0x412/0xc50 fs/hfs/extent.c:353
__block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2042
block_write_begin fs/buffer.c:2153 [inline]
cont_write_begin+0x737/0xae0 fs/buffer.c:2491
hfs_write_begin+0x66/0xb0 fs/hfs/inode.c:53
cont_expand_zero fs/buffer.c:2419 [inline]
cont_write_begin+0x2e7/0xae0 fs/buffer.c:2481
hfs_write_begin+0x66/0xb0 fs/hfs/inode.c:53
hfs_file_truncate+0x1cf/0xb70 fs/hfs/extent.c:495
hfs_inode_setattr+0x4a9/0x670 fs/hfs/inode.c:667
notify_change+0xc18/0xf60 fs/attr.c:556
do_truncate+0x1c2/0x250 fs/open.c:68
vfs_truncate+0x4b7/0x540 fs/open.c:118
ksys_truncate+0xf3/0x1c0 fs/open.c:142
__do_sys_truncate fs/open.c:154 [inline]
__se_sys_truncate fs/open.c:152 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:152
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98f8d1cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f98f6f76028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f98f8f95fa0 RCX: 00007f98f8d1cdd9
RDX: 0000000000000000 RSI: 0000000002fffffd RDI: 0000200000000940
RBP: 00007f98f8db2d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98f8f96038 R14: 00007f98f8f95fa0 R15: 00007ffca72267c8
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
RIP: 0010:do_raw_spin_lock+0x73/0x2f0 kernel/locking/spinlock_debug.c:115
Code: c7 44 24 30 c0 f6 a0 81 4c 8d 64 24 20 49 c1 ec 03 48 b8 f1 f1 f1 f1 f8 f3 f3 f3 49 89 04 14 4c 8d 77 04 4c 89 f0 48 c1 e8 03 <0f> b6 04 10 84 c0 0f 85 f3 01 00 00 41 8b 06 3d ad 4e ad de 0f 85
RSP: 0018:ffffc90004dbeb20 EFLAGS: 00010003
RAX: 000000000000015b RBX: 0000000000000ad8 RCX: 0000000080000003
RDX: dffffc0000000000 RSI: ffffffff8ba74ec0 RDI: 0000000000000ad8
RBP: ffffc90004dbebe0 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f11cdf R12: 1ffff920009b7d68
R13: ffffc90004dbece0 R14: 0000000000000adc R15: 0000000000000ad8
FS: 00007f98f6f766c0(0000) GS:ffff888126176000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70469f5000 CR3: 000000003b3da000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: c7 44 24 30 c0 f6 a0 movl $0x81a0f6c0,0x30(%rsp)
7: 81
8: 4c 8d 64 24 20 lea 0x20(%rsp),%r12
d: 49 c1 ec 03 shr $0x3,%r12
11: 48 b8 f1 f1 f1 f1 f8 movabs $0xf3f3f3f8f1f1f1f1,%rax
18: f3 f3 f3
1b: 49 89 04 14 mov %rax,(%r12,%rdx,1)
1f: 4c 8d 77 04 lea 0x4(%rdi),%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 0f b6 04 10 movzbl (%rax,%rdx,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 f3 01 00 00 jne 0x229
36: 41 8b 06 mov (%r14),%eax
39: 3d ad 4e ad de cmp $0xdead4ead,%eax
3e: 0f .byte 0xf
3f: 85 .byte 0x85