------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS)
WARNING: CPU: 1 PID: 837 at kernel/locking/lockdep.c:3315 __lock_acquire+0x13bf/0x4700 kernel/locking/lockdep.c:3315
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 837 Comm: kworker/u4:3 Not tainted 5.0.0+ #114
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x45 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:__lock_acquire+0x13bf/0x4700 kernel/locking/lockdep.c:3315
Code: 8b 1d a9 21 06 08 45 85 db 0f 85 d6 f4 ff ff 48 c7 c6 80 a4 6b 87 48 c7 c7 e0 78 6b 87 44 89 9c 24 98 00 00 00 e8 0f 26 ec ff <0f> 0b 44 8b 9c 24 98 00 00 00 e9 af f4 ff ff 8b 3d bc e4 fe 08 85
RSP: 0018:ffff8880ae907a00 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000066c4c53a RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff815a65c6 RDI: ffffed1015d20f32
RBP: ffff8880ae907bc8 R08: ffff8880a860c6c0 R09: fffffbfff1133335
R10: fffffbfff1133334 R11: ffffffff889999a3 R12: ffff8880a860cff8
R13: ffff8880a860d002 R14: 0000000066c4c53a R15: ffff8880a860c6c0
 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
 spin_lock include/linux/spinlock.h:329 [inline]
 __queue_work+0x9ce/0x1180 kernel/workqueue.c:1434
 delayed_work_timer_fn+0x5d/0x90 kernel/workqueue.c:1520
 call_timer_fn+0x190/0x720 kernel/time/timer.c:1325
 expire_timers kernel/time/timer.c:1358 [inline]
 __run_timers kernel/time/timer.c:1681 [inline]
 __run_timers kernel/time/timer.c:1649 [inline]
 run_timer_softirq+0x44c/0x1700 kernel/time/timer.c:1694
 __do_softirq+0x266/0x95a kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:lock_is_held_type+0x10/0x210 kernel/locking/lockdep.c:3868
Code: 8b 7d c8 e8 d2 f4 50 00 e9 60 ff ff ff e8 c8 f4 50 00 eb ac 66 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 <41> 54 49 89 fc 53 65 48 8b 1c 25 40 ee 01 00 48 8d bb 7c 08 00 00
RSP: 0018:ffff8880a861fb38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff12b9ef3
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff889a4100
RBP: ffff8880a861fb40 R08: ffff8880a860c6c0 R09: 0000000000000004
R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: ffffffff88071580
R13: 000000000000010a R14: 00000000000634f6 R15: dffffc0000000000
 lock_is_held include/linux/lockdep.h:337 [inline]
 ___might_sleep+0x1c4/0x280 kernel/sched/core.c:6126
 inet_twsk_purge+0x96/0x5f0 net/ipv4/inet_timewait_sock.c:266
 dccp_v6_exit_batch+0x1a/0x20 net/dccp/ipv6.c:1116
 ops_exit_list.isra.0+0x105/0x160 net/core/net_namespace.c:156
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..