JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.1286/11732 is trying to acquire lock:
ffff8881b0ce97a0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850

but task is already holding lock:
ffff8881b0ce97a0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850

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

       CPU0
       ----
  lock(&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]);
  lock(&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

4 locks held by syz.0.1286/11732:
 #0: ffff888171d3e450 (sb_writers#35){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b0cf25a0 (&type->i_mutex_dir_key#23/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
 #2: ffff8881bc39eba0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850
 #3: ffff8881b0ce97a0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850

stack backtrace:
CPU: 1 UID: 0 PID: 11732 Comm: syz.0.1286 Not tainted syzkaller #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+0xe8/0x150
 print_deadlock_bug+0x279/0x290
 __lock_acquire+0x24df/0x2cf0
 lock_acquire+0x106/0x350
 down_write+0x96/0x200
 ocfs2_reserve_suballoc_bits+0x170/0x4850
 ocfs2_reserve_clusters_with_limit+0x3bc/0xc20
 ocfs2_mknod+0x110d/0x2240
 ocfs2_mkdir+0x181/0x460
 vfs_mkdir+0x406/0x620
 filename_mkdirat+0x285/0x510
 __se_sys_mkdir+0x34/0x150
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feda3d9de99
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:00007feda4c31028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007feda4025fa0 RCX: 00007feda3d9de99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000300
RBP: 00007feda3e33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feda4026038 R14: 00007feda4025fa0 R15: 00007fff31ab3178
 </TASK>
