============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
kworker/0:1H/1045 is trying to acquire lock:
ffff8880724d4038 (&gl->gl_lockref.lock){+.+.}-{2:2}
, at: spin_lock include/linux/spinlock.h:351 [inline]
, at: lockref_get+0x11/0x50 lib/lockref.c:50

but task is already holding lock:
ffff8880724d4038 (&gl->gl_lockref.lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff8880724d4038 (&gl->gl_lockref.lock){+.+.}-{2:2}, at: glock_work_func+0xa2/0x470 fs/gfs2/glock.c:1074

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

       CPU0
       ----
  lock(
&gl->gl_lockref.lock);
  lock(&gl->gl_lockref.lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by kworker/0:1H/1045:
 #0: ffff888019b2d538 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #1: ffffc90004b4fd00 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
 #2: ffff8880724d4038 (&gl->gl_lockref.lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffff8880724d4038 (&gl->gl_lockref.lock){+.+.}-{2:2}, at: glock_work_func+0xa2/0x470 fs/gfs2/glock.c:1074

stack backtrace:
CPU: 0 PID: 1045 Comm: kworker/0:1H Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: glock_workqueue glock_work_func
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 __lock_acquire+0x12c8/0x7c40 kernel/locking/lockdep.c:-1
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 lockref_get+0x11/0x50 lib/lockref.c:50
 gfs2_glock_hold fs/gfs2/glock.c:192 [inline]
 do_xmote+0x573/0x13e0 fs/gfs2/glock.c:806
 glock_work_func+0x25c/0x470 fs/gfs2/glock.c:1089
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>