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WARNING: CPU: 0 PID: 6332 at kernel/signal.c:358 task_participate_group_stop+0x1b3/0x210 kernel/signal.c:358
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6332 Comm: file0 Not tainted 4.14.175-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+0x13e/0x194 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x2f/0x30 kernel/panic.c:547
 report_bug+0x20a/0x248 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:963
RIP: 0010:task_participate_group_stop+0x1b3/0x210 kernel/signal.c:358
RSP: 0018:ffff88808f8cfbe0 EFLAGS: 00010097
RAX: ffff888097cde680 RBX: ffff8880a7a76e00 RCX: ffff8880a7a76e9c
RDX: 0000000000000000 RSI: 0000000000020000 RDI: ffff888097cde680
RBP: 0000000000000000 R08: 0000000000005aab R09: ffffffff8a088dd8
R10: ffff888097cdef00 R11: ffff888097cde680 R12: ffff8880a7a76e98
R13: ffff88808f8cff58 R14: dffffc0000000000 R15: ffff88808f8cff58
 do_signal_stop+0x199/0x750 kernel/signal.c:2112
 get_signal+0xd02/0x1ca0 kernel/signal.c:2298
 do_signal+0x7c/0x1690 arch/x86/kernel/signal.c:814
 exit_to_usermode_loop+0x159/0x220 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+0x42/0xb7
RIP: 0033:0x4468d9
RSP: 002b:00007f91f8755d98 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffea RBX: 00000000006dbc58 RCX: 00000000004468d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00000000006dbc50 R08: 00007f91f8756700 R09: 0000000000000000
R10: 00007f91f8756700 R11: 0000000000000246 R12: 00000000006dbc5c
R13: 0000000000000000 R14: 07007ff8464c457f R15: 000000000000f172
Kernel Offset: disabled
Rebooting in 86400 seconds..