============================================
WARNING: possible recursive locking detected
6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 Not tainted
--------------------------------------------
syz.5.1724/17535 is trying to acquire lock:
ffff88811367e400 (&sb->s_type->i_mutex_key#22){++++}-{4:4}, at: bch2_symlink+0xf2/0x240

but task is already holding lock:
ffff88802ab99078 (&sb->s_type->i_mutex_key#22){++++}-{4:4}, at: ovl_create_temp+0x54/0xb0

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

       CPU0
       ----
  lock(&sb->s_type->i_mutex_key#22);
  lock(&sb->s_type->i_mutex_key#22);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

6 locks held by syz.5.1724/17535:
 #0: ffff888021f38428 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88803871d258 (&ovl_i_mutex_dir_key[depth]/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0
 #2: ffff888127c16978 (&ovl_i_mutex_key[depth]){+.+.}-{4:4}, at: vfs_link+0x3b4/0x6e0
 #3: ffff888127c16d30 (&ovl_i_lock_key[depth]){+.+.}-{4:4}, at: ovl_copy_up_start+0x56/0x330
 #4: ffff888031ac4428 (sb_writers#13){.+.+}-{0:0}, at: ovl_copy_up_flags+0x1090/0x2fe0
 #5: ffff88802ab99078 (&sb->s_type->i_mutex_key#22){++++}-{4:4}, at: ovl_create_temp+0x54/0xb0

stack backtrace:
CPU: 1 UID: 0 PID: 17535 Comm: syz.5.1724 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_deadlock_bug+0x28b/0x2a0
 validate_chain+0x1a3f/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 down_write+0x96/0x1f0
 bch2_symlink+0xf2/0x240
 vfs_symlink+0x143/0x2f0
 ovl_do_symlink+0x89/0xd0
 ovl_create_real+0x245/0x410
 ovl_create_temp+0x70/0xb0
 ovl_copy_up_flags+0x10aa/0x2fe0
 ovl_link+0x85/0x270
 vfs_link+0x4ed/0x6e0
 do_linkat+0x272/0x560
 __x64_sys_linkat+0xd4/0xf0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fece978ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fecea50e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000109
RAX: ffffffffffffffda RBX: 00007fece99b6090 RCX: 00007fece978ebe9
RDX: ffffffffffffff9c RSI: 00002000000006c0 RDI: ffffffffffffff9c
RBP: 00007fece9811e19 R08: 0000000000001000 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fece99b6128 R14: 00007fece99b6090 R15: 00007fff05236ad8
 </TASK>
