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WARNING: CPU: 1 PID: 8020 at kernel/signal.c:358 task_participate_group_stop+0x237/0x2b0 kernel/signal.c:358
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8020 Comm: 4 Not tainted 4.14.212-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:task_participate_group_stop+0x237/0x2b0 kernel/signal.c:358
RSP: 0018:ffff88808bddfbc0 EFLAGS: 00010097
RAX: ffff8880b18723c0 RBX: 0000000000000000 RCX: 0000000000007cec
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880b1872ac0
RBP: ffff8880a709a0d8 R08: ffffffff8b9c7220 R09: 00000000000c008d
R10: ffff8880b1872c48 R11: ffff8880b18723c0 R12: ffff8880a709a040
R13: ffff8880b1872850 R14: 0000000000040000 R15: 0000000000000013
 do_signal_stop+0x1ab/0x770 kernel/signal.c:2112
 get_signal+0xd2c/0x1ca0 kernel/signal.c:2298
 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:814
 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0023:0xb7000000
RSP: 002b:00000000ffa92930 EFLAGS: 00000200 ORIG_RAX: 000000000000000b
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..