netdev - Re: [syzbot] WARNING: stack going in the wrong direction? at __sys

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Message-ID: <CACT4Y+YzZb2vscjBLiJ-p-ghbu77o851gbESfE=nZebXqfgE4g@mail.gmail.com>
Date:   Thu, 16 Feb 2023 11:04:05 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+91c3651bb190d53b4d16@...kaller.appspotmail.com>,
        jpoimboe@...nel.org, Ingo Molnar <mingo@...nel.org>
Cc:     bpf@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        richardcochran@...il.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING: stack going in the wrong direction? at __sys_setsockopt

On Thu, 16 Feb 2023 at 11:00, syzbot
<syzbot+91c3651bb190d53b4d16@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    9d9019bcea1a Add linux-next specific files for 20230215
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=11ad7710c80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=60f48e09dc64b527
> dashboard link: https://syzkaller.appspot.com/bug?extid=91c3651bb190d53b4d16
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/7a22fa9fb779/disk-9d9019bc.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/68851ce42fd7/vmlinux-9d9019bc.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/09be0a2c410b/bzImage-9d9019bc.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+91c3651bb190d53b4d16@...kaller.appspotmail.com
>
> WARNING: stack going in the wrong direction? at __sys_setsockopt+0x2c6/0x5b0 net/socket.c:2271

+Josh, Ingo,

Yesterday we started seeing lots of "stack going in the wrong
direction" all over the kernel.

I see there is only your recent commit to ORC unwinder:
"x86/unwind/orc: Add 'signal' field to ORC metadata"

Can it be related?


> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
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