WARNING: CPU: 1 PID: 2985 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230 kernel/signal.c:340
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2985 Comm: syz-executor0 Not tainted 4.14.0-rc5+ #137
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x417 kernel/panic.c:181
 __warn+0x1c4/0x1d9 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 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:ffff8801d1d8f8b8 EFLAGS: 00010097
RAX: ffff8801d1d7c600 RBX: ffff8801d1d7c600 RCX: 0000000000000012
RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d1d7ca90
RBP: ffff8801d1d8f8d0 R08: ffffffff8143968c R09: 000000000000000c
R10: ffff8801d1d8f7b0 R11: 0000000000000000 R12: ffff8801d1cf5300
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d1d7cb88
 do_signal_stop+0x217/0x910 kernel/signal.c:2042
 get_signal+0x55a/0x16d0 kernel/signal.c:2297
 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: 0033:0x47dd60
RSP: 002b:0000000000a6fa08 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
RAX: 0000000000000000 RBX: 00000000010cb914 RCX: 000000000047dd60
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a6fa10
RBP: 0000000000000002 R08: 0000000000000001 R09: 00000000010cb940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000002 R14: 000000000000e447 R15: 0000000000000016