WARNING: CPU: 1 PID: 20408 at kernel/locking/lockdep.c:4751 remove_class_from_lock_chain kernel/locking/lockdep.c:4731 [inline]
WARNING: CPU: 1 PID: 20408 at kernel/locking/lockdep.c:4751 remove_class_from_lock_chains kernel/locking/lockdep.c:4771 [inline]
WARNING: CPU: 1 PID: 20408 at kernel/locking/lockdep.c:4751 zap_class+0x74b/0xe00 kernel/locking/lockdep.c:4811
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 20408 Comm: kworker/1:10 Not tainted 5.2.0-rc4-next-20190613 #14
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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x744 kernel/panic.c:219
 __warn.cold+0x20/0x4d kernel/panic.c:576
 report_bug+0x263/0x2b0 lib/bug.c:186
 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+0x14/0x20 arch/x86/entry/entry_64.S:986
RIP: 0010:remove_class_from_lock_chain kernel/locking/lockdep.c:4751 [inline]
RIP: 0010:remove_class_from_lock_chains kernel/locking/lockdep.c:4771 [inline]
RIP: 0010:zap_class+0x74b/0xe00 kernel/locking/lockdep.c:4811
Code: c1 e8 03 42 0f b6 14 30 4c 89 e0 83 e0 07 83 c0 01 38 d0 7c 80 84 d2 0f 84 78 ff ff ff 4c 89 e7 e8 6a 2f 53 00 e9 6b ff ff ff <0f> 0b e8 1e a1 db 01 e9 44 fb ff ff 48 89 55 c0 4c 89 4d c8 e8 8c
RSP: 0018:ffff888061fafc10 EFLAGS: 00010012
RAX: 0000000000010000 RBX: 6c1fff971ae52b8e RCX: ffffffff8334477e
RDX: 000000000000046c RSI: ffffffff833447ca RDI: 0000000000000006
RBP: ffff888061fafc68 R08: ffff888038a4a6c0 R09: ffffffff8a4accc0
R10: 0457002906bc039b R11: 002906bc039b06c4 R12: ffffffff8a083c68
R13: ffffffff8a083c60 R14: dffffc0000000000 R15: 0000000000000000
 __lockdep_free_key_range+0x64/0x120 kernel/locking/lockdep.c:4934
 lockdep_unregister_key+0x201/0x4c0 kernel/locking/lockdep.c:5126
 wq_unregister_lockdep kernel/workqueue.c:3456 [inline]
 pwq_unbound_release_workfn+0x233/0x2f0 kernel/workqueue.c:3676
 process_one_work+0x989/0x1790 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x354/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..