============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.408/11239 is trying to acquire lock:
ffff888041dc4818 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf9/0x1680 fs/hfs/extent.c:403

but task is already holding lock:
ffff888041dc2798 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf9/0x1680 fs/hfs/extent.c:403

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&HFS_I(tree->inode)->extents_lock);
  lock(&HFS_I(tree->inode)->extents_lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

locks held by syz.0.408/11239: 5, on CPU#1:
 #0: ffff888067616528 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531
 #1: ffff888041dc3670 (&type->i_mutex_dir_key#10){++++}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline]
 #1: ffff888041dc3670 (&type->i_mutex_dir_key#10){++++}-{4:4}, at: lookup_open+0x24c/0x1b00 fs/namei.c:4468
 #2: ffff888034bdc0a0 (&tree->tree_lock){+.+.}-{4:4}, at: hfs_find_init+0x18d/0x300 fs/hfs/bfind.c:-1
 #3: ffff888041dc2798 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf9/0x1680 fs/hfs/extent.c:403
 #4: ffff888030c940a0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x18d/0x300 fs/hfs/bfind.c:-1

stack backtrace:
CPU: 1 UID: 0 PID: 11239 Comm: syz.0.408 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x27a/0x290 kernel/locking/lockdep.c:3085
 check_deadlock kernel/locking/lockdep.c:3137 [inline]
 validate_chain kernel/locking/lockdep.c:3939 [inline]
 __lock_acquire+0x25db/0x2de0 kernel/locking/lockdep.c:5288
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline]
 mutex_lock_nested+0x55/0x1d0 kernel/locking/rtmutex_api.c:580
 hfs_extend_file+0xf9/0x1680 fs/hfs/extent.c:403
 hfs_bmap_reserve+0x108/0x430 fs/hfs/btree.c:402
 __hfs_ext_write_extent+0x200/0x620 fs/hfs/extent.c:121
 __hfs_ext_cache_extent+0x6e/0x9b0 fs/hfs/extent.c:180
 hfs_ext_read_extent fs/hfs/extent.c:208 [inline]
 hfs_extend_file+0x3ad/0x1680 fs/hfs/extent.c:407
 hfs_bmap_reserve+0x108/0x430 fs/hfs/btree.c:402
 hfs_cat_create+0x23d/0x870 fs/hfs/catalog.c:104
 hfs_create+0x78/0xe0 fs/hfs/dir.c:196
 lookup_open+0x103d/0x1b00 fs/namei.c:4575
 open_last_lookups fs/namei.c:4774 [inline]
 path_openat+0x711/0x2100 fs/namei.c:5013
 do_file_open+0x23e/0x4a0 fs/namei.c:5045
 do_sys_openat2+0x115/0x200 fs/open.c:1443
 do_sys_open fs/open.c:1449 [inline]
 __do_sys_creat fs/open.c:1527 [inline]
 __se_sys_creat fs/open.c:1521 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1521
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5d5b1a8f19
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:00007f5d593cd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f5d5b426090 RCX: 00007f5d5b1a8f19
RDX: 0000000000000000 RSI: 00000000000000d4 RDI: 0000200000000a80
RBP: 00007f5d5b237f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5d5b426128 R14: 00007f5d5b426090 R15: 00007ffffa2af038
 </TASK>
hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:478 at hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478, CPU#1: syz.0.408/11239
Modules linked in:
CPU: 1 UID: 0 PID: 11239 Comm: syz.0.408 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478
Code: a9 8b 89 ee e8 37 09 6d fe e9 d6 fc ff ff e8 5d 8d 0d ff 4c 89 ef e8 75 fb bd 08 48 c7 c7 20 f9 a9 8b 89 ee e8 17 09 6d fe 90 <0f> 0b 90 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c dd fb ff ff
RSP: 0018:ffffc90005eb7168 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff888030c94000 RCX: 530d5f70cfbe9a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000bd6ddd R12: 0000000000000000
R13: ffff888030c940d0 R14: ffff88802c2fa000 R15: dffffc0000000000
FS:  00007f5d593cd6c0(0000) GS:ffff88812480e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5d50f27ff8 CR3: 000000003e2fa000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfs_btree_inc_height+0xf9/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x7eb/0xc80 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x34b/0x620 fs/hfs/extent.c:124
 __hfs_ext_cache_extent+0x6e/0x9b0 fs/hfs/extent.c:180
 hfs_ext_read_extent fs/hfs/extent.c:208 [inline]
 hfs_extend_file+0x3ad/0x1680 fs/hfs/extent.c:407
 hfs_bmap_reserve+0x108/0x430 fs/hfs/btree.c:402
 hfs_cat_create+0x23d/0x870 fs/hfs/catalog.c:104
 hfs_create+0x78/0xe0 fs/hfs/dir.c:196
 lookup_open+0x103d/0x1b00 fs/namei.c:4575
 open_last_lookups fs/namei.c:4774 [inline]
 path_openat+0x711/0x2100 fs/namei.c:5013
 do_file_open+0x23e/0x4a0 fs/namei.c:5045
 do_sys_openat2+0x115/0x200 fs/open.c:1443
 do_sys_open fs/open.c:1449 [inline]
 __do_sys_creat fs/open.c:1527 [inline]
 __se_sys_creat fs/open.c:1521 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1521
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5d5b1a8f19
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:00007f5d593cd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f5d5b426090 RCX: 00007f5d5b1a8f19
RDX: 0000000000000000 RSI: 00000000000000d4 RDI: 0000200000000a80
RBP: 00007f5d5b237f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5d5b426128 R14: 00007f5d5b426090 R15: 00007ffffa2af038
 </TASK>