process 'syzkaller-testdir562255677/syzkaller.0sy7LI/0/file0' started with executable stack
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8391 at kernel/signal.c:378 task_participate_group_stop+0x20a/0x270 kernel/signal.c:378
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8391 Comm: file0 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x35 kernel/panic.c:582
 report_bug+0x27b/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 fixup_bug arch/x86/kernel/traps.c:170 [inline]
 do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:task_participate_group_stop+0x20a/0x270 kernel/signal.c:378
Code: ac 00 00 00 41 bc 01 00 00 00 e8 01 67 2b 00 44 89 e0 5b 5d 41 5c 41 5d c3 e8 f2 66 2b 00 0f 0b e9 7e fe ff ff e8 e6 66 2b 00 <0f> 0b e9 ee fe ff ff 48 89 ef e8 97 87 69 00 e9 b8 fe ff ff 48 89
RSP: 0018:ffffc90009fd7c48 EFLAGS: 00010093
RAX: ffff8880929a6040 RBX: 0000000000000000 RCX: ffffffff8147cc87
RDX: 0000000000000000 RSI: ffffffff8147cdaa RDI: 0000000000000005
RBP: ffff88809aeaf228 R08: ffff8880929a6040 R09: fffff520013faf8c
R10: 0000000000000003 R11: fffff520013faf8b R12: ffff88809aeaf180
R13: 0000000000040000 R14: ffff8880929a6040 R15: ffff8880909f0d00
 do_signal_stop+0x1df/0x840 kernel/signal.c:2368
 get_signal+0x100a/0x24e0 kernel/signal.c:2593
 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:784
 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45c829
Code: Bad RIP value.
RSP: 002b:00007f2283a2ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffea RBX: 00000000004db4c0 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000000a8 R14: 00000000004c33ac R15: 00007f2283a2f6d4
Kernel Offset: disabled
Rebooting in 86400 seconds..