function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 493
gfs2: fsid=syz:syz.0: about to withdraw this file system
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
kworker/1:7/4232 is trying to acquire lock:
ffff88801c1ec938 ((wq_completion)delete_workqueue){+.+.}-{0:0}, at: flush_workqueue+0x14e/0x1390 kernel/workqueue.c:2830

but task is already holding lock:
ffff88801c1ec938 ((wq_completion)delete_workqueue){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1

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

       CPU0
       ----
  lock((wq_completion)delete_workqueue);
  lock((wq_completion)delete_workqueue);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by kworker/1:7/4232:
 #0: ffff88801c1ec938 ((wq_completion)delete_workqueue){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc9000348fd00 ((work_completion)(&(&gl->gl_delete)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285

stack backtrace:
CPU: 1 PID: 4232 Comm: kworker/1:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: delete_workqueue delete_work_func
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 check_deadlock kernel/locking/lockdep.c:3048 [inline]
 validate_chain kernel/locking/lockdep.c:3842 [inline]
 __lock_acquire+0x67eb/0x7d40 kernel/locking/lockdep.c:5120
 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
 flush_workqueue+0x16a/0x1390 kernel/workqueue.c:2830
 gfs2_make_fs_ro+0xd7/0x620 fs/gfs2/super.c:533
 signal_our_withdraw fs/gfs2/util.c:166 [inline]
 gfs2_withdraw+0x660/0x14e0 fs/gfs2/util.c:335
 gfs2_meta_check_ii+0x6e/0x80 fs/gfs2/util.c:490
 gfs2_metatype_check_i fs/gfs2/util.h:126 [inline]
 gfs2_meta_buffer+0x232/0x310 fs/gfs2/meta_io.c:493
 gfs2_meta_inode_buffer fs/gfs2/meta_io.h:70 [inline]
 gfs2_inode_refresh+0xbb/0x11a0 fs/gfs2/glops.c:493
 gfs2_inode_lookup+0x841/0xd20 fs/gfs2/inode.c:199
 gfs2_lookup_by_inum+0x4e/0xf0 fs/gfs2/inode.c:250
 delete_work_func+0x198/0x590 fs/gfs2/glock.c:1004
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>