JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,6) on (node local, slot 0) with ordered data mode.
============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.6.784/8662 is trying to acquire lock:
ffff88811904cfa0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850

but task is already holding lock:
ffff88811904cfa0 (&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

locks held by syz.6.784/8662: 4, last CPU#0:
 #0: ffff88810faa8460 (sb_writers#20){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881190517a0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
 #2: ffff88811904b3a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850
 #3: ffff88811904cfa0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850

stack backtrace:
CPU: 0 UID: 0 PID: 8662 Comm: syz.6.784 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0x27a/0x290
 __lock_acquire+0x261c/0x2e50
 lock_acquire+0x115/0x350
 down_write+0x96/0x200
 ocfs2_reserve_suballoc_bits+0x170/0x4850
 ocfs2_reserve_clusters_with_limit+0x3bc/0xc20
 ocfs2_mknod+0xf10/0x22b0
 ocfs2_mkdir+0x180/0x430
 vfs_mkdir+0x40c/0x620
 filename_mkdirat+0x285/0x510
 __se_sys_mkdirat+0x35/0x150
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f563f79cfc7
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007f564074ae58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f564074aee0 RCX: 00007f563f79cfc7
RDX: 00000000000001ff RSI: 0000200000000e40 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000e40
R13: 00007f564074aea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
