DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use))
WARNING: CPU: 0 PID: 8687 at kernel/locking/lockdep.c:3925 __lock_acquire+0x15de/0x4a00 kernel/locking/lockdep.c:3925
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8687 Comm: kworker/u4:6 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2dc/0x755 kernel/panic.c:220
 __warn.cold+0x2f/0x3c kernel/panic.c:581
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:__lock_acquire+0x15de/0x4a00 kernel/locking/lockdep.c:3925
Code: d2 0f 85 bf 28 00 00 44 8b 3d ae f4 6c 08 45 85 ff 0f 85 34 fc ff ff 48 c7 c6 c0 39 ac 87 48 c7 c7 20 15 ac 87 e8 ba 57 eb ff <0f> 0b e9 1d fc ff ff 4c 8b 95 28 ff ff ff 4c 8b 9d 20 ff ff ff 4c
RSP: 0018:ffff888065257930 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ca866 RDI: ffffed100ca4af18
RBP: ffff888065257a48 R08: ffff88806524a680 R09: fffffbfff11f4051
R10: fffffbfff11f4050 R11: ffffffff88fa0283 R12: a2e8b980bb644513
R13: ffffffffbb644513 R14: 0000000000000000 R15: 0000000000000000
 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:159
 __wake_up_common_lock+0xc8/0x150 kernel/sched/wait.c:122
 __wake_up+0xe/0x10 kernel/sched/wait.c:142
 finish_writeback_work.isra.0+0xf6/0x120 fs/fs-writeback.c:168
 wb_do_writeback fs/fs-writeback.c:2030 [inline]
 wb_workfn+0x34f/0x1220 fs/fs-writeback.c:2070
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..