Enabling of bearer <udp:syz0> rejected, already enabled
32-bit node address hash set to 100007f
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS)
WARNING: CPU: 0 PID: 21 at kernel/locking/lockdep.c:3315 __lock_acquire+0x13bf/0x4700 kernel/locking/lockdep.c:3315
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.0.0-rc4+ #49
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: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 09 c2 05 08 45 85 db 0f 85 d6 f4 ff ff 48 c7 c6 a0 a4 6b 87 48 c7 c7 00 79 6b 87 44 89 9c 24 98 00 00 00 e8 9f 31 ec ff <0f> 0b 44 8b 9c 24 98 00 00 00 e9 af f4 ff ff 8b 3d bc 7c fe 08 85
RSP: 0018:ffff8880a99c77a0 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 00000000005e5f07 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815a8d06 RDI: ffffed1015338ee6
RBP: ffff8880a99c7970 R08: ffff8880a99ba580 R09: fffffbfff1133341
R10: fffffbfff1133340 R11: ffffffff88999a03 R12: ffff8880a99bae90
R13: ffff8880a99bae9a R14: 00000000005e5f07 R15: ffff8880a99ba580
 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+0x23d/0x1180 kernel/workqueue.c:1417
 queue_work_on+0x192/0x200 kernel/workqueue.c:1486
 queue_work include/linux/workqueue.h:512 [inline]
 rxrpc_destroy_all_client_connections+0x92/0xb8 net/rxrpc/conn_client.c:1151
 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/0x1760 kernel/workqueue.c:2153
 worker_thread+0x98/0xe40 kernel/workqueue.c:2296
 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..