ODEBUG: assert_init not available (active state 0) object type: timer_list hint:           (null)
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7307 at lib/debugobjects.c:287 debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287
Kernel panic - not syncing: panic_on_warn set ...

kobject: 'loop1' (ffff8880a48d3720): kobject_uevent_env
CPU: 1 PID: 7307 Comm: kworker/u4:5 Not tainted 4.14.113 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: tipc_send tipc_send_work
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
 panic+0x1f2/0x438 kernel/panic.c:182
 __warn.cold+0x2f/0x34 kernel/panic.c:546
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:944
RIP: 0010:debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287
RSP: 0018:ffff88806140f9d8 EFLAGS: 00010286
RAX: 0000000000000061 RBX: 0000000000000005 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff866d0860 RDI: ffffed100c281f31
RBP: ffff88806140fa00 R08: 0000000000000061 R09: ffff888061ffeb70
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff866cba60
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880960e8018
 debug_object_assert_init lib/debugobjects.c:656 [inline]
 debug_object_assert_init+0x232/0x300 lib/debugobjects.c:627
 debug_timer_assert_init kernel/time/timer.c:707 [inline]
 debug_assert_init kernel/time/timer.c:755 [inline]
 del_timer+0x67/0xf0 kernel/time/timer.c:1150
 tipc_subscrb_subscrp_delete+0x16a/0x3a0 net/tipc/subscr.c:207
 tipc_subscrb_delete net/tipc/subscr.c:238 [inline]
 tipc_subscrb_release_cb+0x18/0x30 net/tipc/subscr.c:316
 tipc_close_conn+0x179/0x210 net/tipc/server.c:203
 tipc_send_to_sock net/tipc/server.c:538 [inline]
 tipc_send_work+0x470/0x5a0 net/tipc/server.c:564
 process_one_work+0x868/0x1610 kernel/workqueue.c:2114
 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
 kthread+0x31c/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Kernel Offset: disabled
Rebooting in 86400 seconds..