------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS)
WARNING: CPU: 0 PID: 8707 at kernel/locking/lockdep.c:3673 __lock_acquire+0x1887/0x3fb0 kernel/locking/lockdep.c:3673
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8707 Comm: kworker/u4:8 Not tainted 5.1.0-rc2+ #115
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __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: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:973
RIP: 0010:__lock_acquire+0x1887/0x3fb0 kernel/locking/lockdep.c:3673
Code: d2 0f 85 7b 1f 00 00 44 8b 3d 79 66 07 08 45 85 ff 0f 85 20 f3 ff ff 48 c7 c6 00 5b 6b 87 48 c7 c7 40 31 6b 87 e8 47 e2 eb ff <0f> 0b e9 09 f3 ff ff 0f 0b e9 41 f1 ff ff 8b 1d d5 8b 05 09 85 db
RSP: 0018:ffff888060d8f838 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ae3f6 RDI: ffffed100c1b1ef9
RBP: ffff888060d8f970 R08: ffff888060f403c0 R09: fffffbfff11335fd
R10: fffffbfff11335fc R11: ffffffff8899afe3 R12: 0000000066c4c33b
R13: 0000000000000003 R14: 00000000000c033b R15: 0000000000000000
 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
 __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+0x23d/0x1180 kernel/workqueue.c:1449
 queue_work_on+0x192/0x200 kernel/workqueue.c:1518
 queue_work include/linux/workqueue.h:494 [inline]
 rxrpc_destroy_all_client_connections+0x92/0xb8 net/rxrpc/conn_client.c:1161
 rxrpc_destroy_all_connections+0xa0/0x487 net/rxrpc/conn_object.c:468
 rxrpc_exit_net+0x1c2/0x310 net/rxrpc/net_ns.c:126
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..