------------[ cut here ]------------
WARNING: CPU: 0 PID: 31595 at kernel/locking/lockdep.c:4820 remove_class_from_lock_chains kernel/locking/lockdep.c:4839 [inline]
WARNING: CPU: 0 PID: 31595 at kernel/locking/lockdep.c:4820 zap_class+0x31b/0xd50 kernel/locking/lockdep.c:4880
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 31595 Comm: kworker/0:16 Not tainted 5.4.0-rc2+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events pwq_unbound_release_workfn
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113
 panic+0x264/0x7a9 kernel/panic.c:221
 __warn+0x20e/0x210 kernel/panic.c:582
 report_bug+0x1b6/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0xd7/0x440 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:remove_class_from_lock_chain kernel/locking/lockdep.c:4839 [inline]
RIP: 0010:remove_class_from_lock_chains kernel/locking/lockdep.c:4840 [inline]
RIP: 0010:zap_class+0x31b/0xd50 kernel/locking/lockdep.c:4880
Code: 00 49 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 48 8b 1b 48 85 db 0f 84 d7 06 00 00 48 83 c3 f8 0f 85 ea 00 00 00 e9 c8 06 00 00 <0f> 0b e8 7e 31 e6 01 48 8b 55 d0 49 b8 00 00 00 00 00 fc ff df e9
RSP: 0018:ffff88806c8efbf0 EFLAGS: 00010012
RAX: 0000000000010000 RBX: 0000000000010000 RCX: ffff88809093c040
RDX: 0000000000000000 RSI: 0000000000010000 RDI: 0000000000010000
RBP: ffff88806c8efc50 R08: ffffffff83422858 R09: fffffbfff133d04f
R10: fffffbfff133d04f R11: 0000000000000000 R12: 1ffffffff127c1b5
R13: ffffffff893e0da8 R14: ffffffff89118ba8 R15: 0b6035fc76c02a38
 __lockdep_free_key_range kernel/locking/lockdep.c:5003 [inline]
 lockdep_unregister_key+0x320/0x660 kernel/locking/lockdep.c:5195
 wq_unregister_lockdep kernel/workqueue.c:3455 [inline]
 pwq_unbound_release_workfn+0x213/0x260 kernel/workqueue.c:3675
 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269
 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..