======================================================
WARNING: possible circular locking dependency detected
6.2.0-syzkaller-02299-g4a7d37e824f5 #0 Not tainted
------------------------------------------------------
kworker/1:1H/52 is trying to acquire lock:
ffff88807dcd40e0 (&type->s_umount_key#48){+.+.}-{3:3}, at: freeze_super+0x45/0x3c0 fs/super.c:1667

but task is already holding lock:
ffffc90000bd7da8 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2365

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}:
       process_one_work+0x8fd/0x1750 kernel/workqueue.c:2366
       worker_thread+0x669/0x1090 kernel/workqueue.c:2537
       kthread+0x2e8/0x3a0 kernel/kthread.c:376
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

-> #1 ((wq_completion)glock_workqueue){+.+.}-{0:0}:
       __flush_workqueue+0x118/0x13a0 kernel/workqueue.c:2910
       gfs2_gl_hash_clear+0xb1/0x270 fs/gfs2/glock.c:2191
       gfs2_put_super+0x497/0x670 fs/gfs2/super.c:627
       generic_shutdown_super+0x158/0x410 fs/super.c:491
       kill_block_super+0x9b/0xf0 fs/super.c:1398
       gfs2_kill_sb+0x108/0x170 fs/gfs2/ops_fstype.c:1738
       deactivate_locked_super+0x98/0x160 fs/super.c:331
       deactivate_super+0xb1/0xd0 fs/super.c:362
       cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1177
       task_work_run+0x16f/0x270 kernel/task_work.c:179
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
       exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203
       __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
       syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
       do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&type->s_umount_key#48){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3098 [inline]
       check_prevs_add kernel/locking/lockdep.c:3217 [inline]
       validate_chain kernel/locking/lockdep.c:3832 [inline]
       __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5056
       lock_acquire kernel/locking/lockdep.c:5669 [inline]
       lock_acquire+0x1e3/0x660 kernel/locking/lockdep.c:5634
       down_write+0x92/0x200 kernel/locking/rwsem.c:1573
       freeze_super+0x45/0x3c0 fs/super.c:1667
       freeze_go_sync+0x1df/0x320 fs/gfs2/glops.c:577
       do_xmote+0x2f5/0xc40 fs/gfs2/glock.c:708
       run_queue+0x3cf/0x660 fs/gfs2/glock.c:846
       glock_work_func+0xc2/0x3b0 fs/gfs2/glock.c:1056
       process_one_work+0x9bf/0x1750 kernel/workqueue.c:2390
       worker_thread+0x669/0x1090 kernel/workqueue.c:2537
       kthread+0x2e8/0x3a0 kernel/kthread.c:376
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

other info that might help us debug this:

Chain exists of:
  &type->s_umount_key#48 --> (wq_completion)glock_workqueue --> (work_completion)(&(&gl->gl_work)->work)

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock((work_completion)(&(&gl->gl_work)->work));
                               lock((wq_completion)glock_workqueue);
                               lock((work_completion)(&(&gl->gl_work)->work));
  lock(&type->s_umount_key#48);

 *** DEADLOCK ***

2 locks held by kworker/1:1H/52:
 #0: ffff88801b8ac538 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff88801b8ac538 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff88801b8ac538 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff88801b8ac538 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline]
 #0: ffff88801b8ac538 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline]
 #0: ffff88801b8ac538 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: process_one_work+0x86d/0x1750 kernel/workqueue.c:2361
 #1: ffffc90000bd7da8 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1750 kernel/workqueue.c:2365

stack backtrace:
CPU: 1 PID: 52 Comm: kworker/1:1H Not tainted 6.2.0-syzkaller-02299-g4a7d37e824f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Workqueue: glock_workqueue glock_work_func
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3098 [inline]
 check_prevs_add kernel/locking/lockdep.c:3217 [inline]
 validate_chain kernel/locking/lockdep.c:3832 [inline]
 __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5056
 lock_acquire kernel/locking/lockdep.c:5669 [inline]
 lock_acquire+0x1e3/0x660 kernel/locking/lockdep.c:5634
 down_write+0x92/0x200 kernel/locking/rwsem.c:1573
 freeze_super+0x45/0x3c0 fs/super.c:1667
 freeze_go_sync+0x1df/0x320 fs/gfs2/glops.c:577
 do_xmote+0x2f5/0xc40 fs/gfs2/glock.c:708
 run_queue+0x3cf/0x660 fs/gfs2/glock.c:846
 glock_work_func+0xc2/0x3b0 fs/gfs2/glock.c:1056
 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>