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WARNING: CPU: 1 PID: 3031 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: 3031 Comm: syz-executor2 Not tainted 4.14.0-rc1+ #90
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:ffff88019b0977f0 EFLAGS: 00010097
RAX: ffff88019b08a2c0 RBX: ffff88019b08a2c0 RCX: ffff8801d1535580
RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff88019b08a750
RBP: ffff88019b097808 R08: ffff88019b097180 R09: ffff88019b097178
R10: ffff88019b0970f0 R11: 1ffff100336116eb R12: ffff8801ce5a3740
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88019b08a848
 do_signal_stop+0x217/0x900 kernel/signal.c:2042
 get_signal+0x61c/0x17e0 kernel/signal.c:2297
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x40c42a
RSP: 002b:0000000000a6fa08 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: 0000000000000000 RBX: 0000000001e10914 RCX: 000000000040c42a
RDX: 0000000040000001 RSI: 0000000000a6fa2c RDI: ffffffffffffffff
RBP: 00000000000000dd R08: 0000000000000001 R09: 0000000001e10940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000014 R14: 000000000000d3a0 R15: 0000000000000016
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..