gfs2: fsid=syz:syz.0: fatal: I/O error(s)
gfs2: fsid=syz:syz.0: about to withdraw this file system
BUG: sleeping function called from invalid context at fs/gfs2/glock.c:1281
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4385, name: gfs2_logd
2 locks held by gfs2_logd/4385:
 #0: ffff88807bcb50a8 (&sdp->sd_log_flush_lock){++++}-{3:3}, at: gfs2_log_flush+0xdb/0x2610 fs/gfs2/log.c:1035
 #1: ffff88807bcb4ed0 (&sdp->sd_log_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:363 [inline]
 #1: ffff88807bcb4ed0 (&sdp->sd_log_lock){+.+.}-{2:2}, at: gfs2_log_lock fs/gfs2/log.h:32 [inline]
 #1: ffff88807bcb4ed0 (&sdp->sd_log_lock){+.+.}-{2:2}, at: gfs2_flush_revokes+0x4e/0x80 fs/gfs2/log.c:806
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 4385 Comm: gfs2_logd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 ___might_sleep+0x47c/0x600 kernel/sched/core.c:9658
 gfs2_glock_wait+0x53/0x1c0 fs/gfs2/glock.c:1281
 gfs2_glock_nq_init fs/gfs2/glock.h:246 [inline]
 gfs2_freeze_lock+0x5a/0xc0 fs/gfs2/util.c:107
 signal_our_withdraw fs/gfs2/util.c:160 [inline]
 gfs2_withdraw+0x5bd/0x1460 fs/gfs2/util.c:343
 gfs2_ail1_empty+0x7c2/0x850 fs/gfs2/log.c:369
 gfs2_flush_revokes+0x58/0x80 fs/gfs2/log.c:807
 revoke_lo_before_commit+0x28/0x5f0 fs/gfs2/lops.c:872
 lops_before_commit fs/gfs2/lops.h:40 [inline]
 gfs2_log_flush+0xbff/0x2610 fs/gfs2/log.c:1094
 gfs2_logd+0x3a7/0xf70 fs/gfs2/log.c:1316
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

=============================
[ BUG: Invalid wait context ]
syzkaller #0 Tainted: G        W        
-----------------------------
gfs2_logd/4385 is trying to lock:
ffff888140d92c88 (&wq->mutex){+.+.}-{3:3}, at: flush_workqueue+0x165/0x1380 kernel/workqueue.c:2833
other info that might help us debug this:
context-{4:4}
2 locks held by gfs2_logd/4385:
 #0: ffff88807bcb50a8 (&sdp->sd_log_flush_lock){++++}-{3:3}, at: gfs2_log_flush+0xdb/0x2610 fs/gfs2/log.c:1035
 #1: ffff88807bcb4ed0 (&sdp->sd_log_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:363 [inline]
 #1: ffff88807bcb4ed0 (&sdp->sd_log_lock){+.+.}-{2:2}, at: gfs2_log_lock fs/gfs2/log.h:32 [inline]
 #1: ffff88807bcb4ed0 (&sdp->sd_log_lock){+.+.}-{2:2}, at: gfs2_flush_revokes+0x4e/0x80 fs/gfs2/log.c:806
stack backtrace:
CPU: 0 PID: 4385 Comm: gfs2_logd Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4664 [inline]
 check_wait_context kernel/locking/lockdep.c:4725 [inline]
 __lock_acquire+0x1be9/0x7c60 kernel/locking/lockdep.c:4962
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 __mutex_lock_common+0x1eb/0x2390 kernel/locking/mutex.c:596
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 flush_workqueue+0x165/0x1380 kernel/workqueue.c:2833
 gfs2_make_fs_ro+0xd1/0x5d0 fs/gfs2/super.c:529
 signal_our_withdraw fs/gfs2/util.c:166 [inline]
 gfs2_withdraw+0x5f9/0x1460 fs/gfs2/util.c:343
 gfs2_ail1_empty+0x7c2/0x850 fs/gfs2/log.c:369
 gfs2_flush_revokes+0x58/0x80 fs/gfs2/log.c:807
 revoke_lo_before_commit+0x28/0x5f0 fs/gfs2/lops.c:872
 lops_before_commit fs/gfs2/lops.h:40 [inline]
 gfs2_log_flush+0xbff/0x2610 fs/gfs2/log.c:1094
 gfs2_logd+0x3a7/0xf70 fs/gfs2/log.c:1316
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
BUG: scheduling while atomic: gfs2_logd/4385/0x00000002
INFO: lockdep is turned off.
Modules linked in:
Preemption disabled at:
[<0000000000000000>] 0x0