============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz-executor.0/6076 is trying to acquire lock:
ffff888036e7c0a8 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x273/0x330 fs/hfs/bfind.c:36

but task is already holding lock:
ffff888036e7c0a8 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x273/0x330 fs/hfs/bfind.c:36

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

6 locks held by syz-executor.0/6076:
 #0: ffff88807aa487f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2aa/0x380 fs/file.c:1261
 #1: ffff8880355c4410 (sb_writers#13){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:740
 #2: ffff8880379db490 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
 #2: ffff8880379db490 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: generic_file_write_iter+0x8c/0x3d0 mm/filemap.c:4464
 #3: ffff8880379db2f0 (&HFS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xa6/0xcf0 fs/hfs/extent.c:397
 #4: ffff888036e7c0a8 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x273/0x330 fs/hfs/bfind.c:36
 #5: ffff8880379dc5b0 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xa6/0xcf0 fs/hfs/extent.c:397

stack backtrace:
CPU: 0 UID: 0 PID: 6076 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_deadlock_bug.cold+0xbd/0xca kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x12bb/0x2630 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
 __mutex_lock_common kernel/locking/mutex.c:632 [inline]
 __mutex_lock+0x1a4/0x1b10 kernel/locking/mutex.c:806
 hfs_find_init+0x273/0x330 fs/hfs/bfind.c:36
 hfs_ext_read_extent+0x19d/0x9d0 fs/hfs/extent.c:200
 hfs_extend_file+0x4ff/0xcf0 fs/hfs/extent.c:401
 hfs_bmap_reserve+0x2ab/0x3a0 fs/hfs/btree.c:269
 __hfs_ext_write_extent+0x3c4/0x510 fs/hfs/extent.c:121
 __hfs_ext_cache_extent fs/hfs/extent.c:174 [inline]
 hfs_ext_read_extent+0x805/0x9d0 fs/hfs/extent.c:202
 hfs_extend_file+0x4ff/0xcf0 fs/hfs/extent.c:401
 hfs_get_block+0x17f/0x830 fs/hfs/extent.c:353
 __block_write_begin_int+0x57a/0x19c0 fs/buffer.c:2035
 block_write_begin+0x9d/0x1d0 fs/buffer.c:2146
 cont_write_begin+0x573/0xa10 fs/buffer.c:2484
 hfs_write_begin+0x64/0x120 fs/hfs/inode.c:53
 generic_perform_write+0x292/0xa40 mm/filemap.c:4324
 __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4441
 generic_file_write_iter+0xe1/0x3d0 mm/filemap.c:4467
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_write+0x12a/0x250 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f591aa6e3b9
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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f591b7bd078 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f591ababf80 RCX: 00007f591aa6e3b9
RDX: 000000000208e24b RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007f591aacf498 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f591ababf80 R15: 00007fff028778e8
 </TASK>