============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.5.532/8908 is trying to acquire lock:
ffff8880671256e0 (&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:
ffff888067125120 (&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.5.532/8908: 5, last CPU#0:
 #0: ffff888079c42478 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531
 #1: ffff888067124740 (&sb->s_type->i_mutex_key#34){++++}-{4:4}, at: inode_lock include/linux/fs.h:1026 [inline]
 #1: ffff888067124740 (&sb->s_type->i_mutex_key#34){++++}-{4:4}, at: lookup_open+0x246/0x1ae0 fs/namei.c:4468
 #2: ffff888053a680a8 (&tree->tree_lock#2){+.+.}-{4:4}, at: hfs_find_init+0x18d/0x300 fs/hfs/bfind.c:-1
 #3: ffff888067125120 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf9/0x1680 fs/hfs/extent.c:403
 #4: ffff88807e8b60a8 (&tree->tree_lock#2/1){+.+.}-{4:4}, at: hfs_find_init+0x18d/0x300 fs/hfs/bfind.c:-1

stack backtrace:
CPU: 0 UID: 0 PID: 8908 Comm: syz.5.532 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
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/mutex.c:646 [inline]
 __mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821
 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+0x102d/0x1ae0 fs/namei.c:4575
 open_last_lookups fs/namei.c:4774 [inline]
 path_openat+0x70c/0x20f0 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_openat fs/open.c:1789 [inline]
 __se_sys_openat fs/open.c:1784 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1784
 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: 0033:0x00007faf1639fb19
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:00007faf14572028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007faf16626540 RCX: 00007faf1639fb19
RDX: 0000000000143841 RSI: 0000200000000f80 RDI: ffffffffffffff9c
RBP: 00007faf16437b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000130 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faf166265d8 R14: 00007faf16626540 R15: 00007ffed40f8878
 </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#0: syz.5.532/8908
Modules linked in:
CPU: 0 UID: 0 PID: 8908 Comm: syz.5.532 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478
Code: 4a 8c 89 ee e8 a7 7e 60 fe e9 d6 fc ff ff e8 9d f0 01 ff 4c 89 ef e8 85 fa 46 09 48 c7 c7 20 b1 4a 8c 89 ee e8 87 7e 60 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:ffffc900015f7168 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88807e8b6000 RCX: c460746a8ff99d00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc900015f6ee7 R09: 1ffff920002beddc
R10: dffffc0000000000 R11: fffff520002beddd R12: 0000000000000000
R13: ffff88807e8b60d8 R14: ffff88802bbf2100 R15: dffffc0000000000
FS:  00007faf145726c0(0000) GS:ffff8881233f0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d82615000 CR3: 0000000074a40000 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+0x102d/0x1ae0 fs/namei.c:4575
 open_last_lookups fs/namei.c:4774 [inline]
 path_openat+0x70c/0x20f0 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_openat fs/open.c:1789 [inline]
 __se_sys_openat fs/open.c:1784 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1784
 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: 0033:0x00007faf1639fb19
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:00007faf14572028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007faf16626540 RCX: 00007faf1639fb19
RDX: 0000000000143841 RSI: 0000200000000f80 RDI: ffffffffffffff9c
RBP: 00007faf16437b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000130 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faf166265d8 R14: 00007faf16626540 R15: 00007ffed40f8878
 </TASK>