kernel BUG in do_notify_parent

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 1a0e93df1e10 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14afb9c0080000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a010dbf6a7af480
dashboard link: https://syzkaller.appspot.com/bug?extid=30fc148ddf2b12bc714a
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [bra...@kernel.org ebie...@xmission.com kees...@chromium.org linux-...@vger.kernel.org ol...@redhat.com]

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+30fc14...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at kernel/signal.c:2035!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 25692 Comm: syz-executor.4 Not tainted 5.19.0-rc4-syzkaller-00044-g1a0e93df1e10 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022
RIP: 0010:do_notify_parent+0xca5/0xe60 kernel/signal.c:2035
Code: 24 10 45 31 c0 b9 01 00 00 00 44 89 e7 48 8b 95 e0 05 00 00 e8 0c cb ff ff e9 14 fb ff ff e8 42 e6 2f 00 0f 0b e8 3b e6 2f 00 <0f> 0b e8 34 e6 2f 00 48 8d bd 08 06 00 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900054bfa48 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 1ffff92000a97f4c RCX: 0000000000000000
RDX: ffff888078f4a080 RSI: ffffffff8149b145 RDI: 0000000000000007
RBP: ffff888078f4a080 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000008000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000008000000 R14: ffff888078f4a080 R15: ffff88807c656800
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555565a5708 CR3: 000000002e725000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
exit_notify kernel/exit.c:688 [inline]
do_exit+0x2023/0x2a00 kernel/exit.c:815
do_group_exit+0xd2/0x2f0 kernel/exit.c:925
get_signal+0x2542/0x2600 kernel/signal.c:2857
arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f98492ade31
Code: Unable to access opcode bytes at RIP 0x7f98492ade07.
RSP: 002b:00007f984a4c60b0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f984939bf60 RCX: 00007f98492ade31
RDX: 00007f984a4c60f0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f98492e305d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffe3a6826bf R14: 00007f984a4c6300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:do_notify_parent+0xca5/0xe60 kernel/signal.c:2035
Code: 24 10 45 31 c0 b9 01 00 00 00 44 89 e7 48 8b 95 e0 05 00 00 e8 0c cb ff ff e9 14 fb ff ff e8 42 e6 2f 00 0f 0b e8 3b e6 2f 00 <0f> 0b e8 34 e6 2f 00 48 8d bd 08 06 00 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900054bfa48 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 1ffff92000a97f4c RCX: 0000000000000000
RDX: ffff888078f4a080 RSI: ffffffff8149b145 RDI: 0000000000000007
RBP: ffff888078f4a080 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000008000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000008000000 R14: ffff888078f4a080 R15: ffff88807c656800
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555565a5708 CR3: 000000002e725000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.