------------[ cut here ]------------ WARNING: CPU: 1 PID: 1 at kernel/signal.c:334 task_participate_group_stop+0x21d/0x2d0 kernel/signal.c:334() Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 1 Comm: init Not tainted 4.4.107-g610c835 #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 017731753b5047f1 ffff8801da20fa38 ffffffff81d0457d ffffffff838429a0 ffff8801da20fb10 ffffffff838485e0 0000000000000009 000000000000014e ffff8801da20fb00 ffffffff8141774a 0000000041b58ab3 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] panic+0x1aa/0x388 kernel/panic.c:112 [] warn_slowpath_common+0x125/0x140 kernel/panic.c:455 [] warn_slowpath_null+0x29/0x30 kernel/panic.c:492 [] task_participate_group_stop+0x21d/0x2d0 kernel/signal.c:334 [] do_signal_stop+0x19b/0x7a0 kernel/signal.c:2022 [] get_signal+0x4c8/0x1660 kernel/signal.c:2278 [] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712 [] exit_to_usermode_loop+0x122/0x170 arch/x86/entry/common.c:247 [] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline] [] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347 [] int_ret_from_sys_call+0x25/0x9f Shutting down cpus with NMI Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..