======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.391/9200 is trying to acquire lock:
ffff88806437c028 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397

but task is already holding lock:
ffff88802964e0a0 (&tree->tree_lock#2/1){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&tree->tree_lock#2/1){+.+.}-{4:4}:
       __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_cat_create+0x20f/0x800 fs/hfs/catalog.c:104
       hfs_create+0x75/0xe0 fs/hfs/dir.c:202
       lookup_open fs/namei.c:4511 [inline]
       open_last_lookups fs/namei.c:4611 [inline]
       path_openat+0x13b4/0x38a0 fs/namei.c:4855
       do_file_open+0x23e/0x4a0 fs/namei.c:4887
       do_sys_openat2+0x113/0x200 fs/open.c:1364
       do_sys_open fs/open.c:1370 [inline]
       __do_sys_openat fs/open.c:1386 [inline]
       __se_sys_openat fs/open.c:1381 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1381
       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

-> #0 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x15a5/0x2cf0 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_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397
       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

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&tree->tree_lock#2/1);
                               lock(&HFS_I(tree->inode)->extents_lock);
                               lock(&tree->tree_lock#2/1);
  lock(&HFS_I(tree->inode)->extents_lock);

 *** DEADLOCK ***

4 locks held by syz.1.391/9200:
 #0: ffff888028e70480 (sb_writers#25){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
 #1: ffff88806437ad00 (&sb->s_type->i_mutex_key#36){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1034 [inline]
 #1: ffff88806437ad00 (&sb->s_type->i_mutex_key#36){+.+.}-{4:4}, at: do_truncate+0x18f/0x250 fs/open.c:63
 #2: ffff88806437ab28 (&HFS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397
 #3: ffff88802964e0a0 (&tree->tree_lock#2/1){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1

stack backtrace:
CPU: 1 UID: 0 PID: 9200 Comm: syz.1.391 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x15a5/0x2cf0 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_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397
 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: 0033:0x7f48ec63cdd9
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:00007f48ea896028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f48ec8b5fa0 RCX: 00007f48ec63cdd9
RDX: 0000000000000000 RSI: 0000000002fffffd RDI: 0000200000000940
RBP: 00007f48ec6d2d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f48ec8b6038 R14: 00007f48ec8b5fa0 R15: 00007ffca009e438
 </TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc000000015b: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000ad8-0x0000000000000adf]
CPU: 1 UID: 0 PID: 9200 Comm: syz.1.391 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:ffffc90004116b20 EFLAGS: 00010003
RAX: 000000000000015b RBX: 0000000000000ad8 RCX: 0000000080000003
RDX: dffffc0000000000 RSI: ffffffff8ba74ec0 RDI: 0000000000000ad8
RBP: ffffc90004116be0 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f11c5f R12: 1ffff92000822d68
R13: ffffc90004116ce0 R14: 0000000000000adc R15: 0000000000000ad8
FS:  00007f48ea8966c0(0000) GS:ffff888126279000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff5b7de6f22 CR3: 000000004181e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 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: 0033:0x7f48ec63cdd9
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:00007f48ea896028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f48ec8b5fa0 RCX: 00007f48ec63cdd9
RDX: 0000000000000000 RSI: 0000000002fffffd RDI: 0000200000000940
RBP: 00007f48ec6d2d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f48ec8b6038 R14: 00007f48ec8b5fa0 R15: 00007ffca009e438
 </TASK>
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:ffffc90004116b20 EFLAGS: 00010003
RAX: 000000000000015b RBX: 0000000000000ad8 RCX: 0000000080000003
RDX: dffffc0000000000 RSI: ffffffff8ba74ec0 RDI: 0000000000000ad8
RBP: ffffc90004116be0 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f11c5f R12: 1ffff92000822d68
R13: ffffc90004116ce0 R14: 0000000000000adc R15: 0000000000000ad8
FS:  00007f48ea8966c0(0000) GS:ffff888126279000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff5b7de6f22 CR3: 000000004181e000 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