------------[ cut here ]------------
WARNING: CPU: 0 PID: 12855 at kernel/signal.c:349 task_participate_group_stop+0x1b3/0x210 kernel/signal.c:349
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 12855 Comm: 8 Not tainted 4.14.105+ #25
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x10e lib/dump_stack.c:53
 panic+0x1d9/0x3c2 kernel/panic.c:182
 __warn.cold+0x2f/0x3b kernel/panic.c:546
Kernel Offset: 0x3000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..