WARNING: CPU: 0 PID: 1 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230 kernel/signal.c:340
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 1 Comm: init Not tainted 4.14.0-rc5-next-20171018+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:task_participate_group_stop+0x1ce/0x230 kernel/signal.c:340
RSP: 0018:ffff88003eb978b8 EFLAGS: 00010093
RAX: ffff88003eb8e040 RBX: ffff88003eb8e040 RCX: ffffffff8143bece
RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff88003eb8e4c0
RBP: ffff88003eb978d0 R08: ffffffff81441adc R09: 000000000000000c
R10: ffff88003eb977b0 R11: 0000000000000000 R12: ffff88006da9c040
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88003eb8e5b8
 do_signal_stop+0x217/0x910 kernel/signal.c:2041
 get_signal+0x55a/0x16d0 kernel/signal.c:2296
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x7f2bf28cbdd3
RSP: 002b:00007ffc72bfd4c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017
RAX: fffffffffffffdfe RBX: 00007ffc72bfd670 RCX: 00007f2bf28cbdd3
RDX: 0000000000000000 RSI: 00007ffc72bfd820 RDI: 000000000000000b
RBP: 00007ffc72bfd820 R08: 00007ffc72bfd8a0 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00007ffc72bfdc00 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..