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

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Message-ID: <CACT4Y+arK9hQ=aov0z-ciX8=KRmcLhGec--KWAwoMx7wfcnmsw@mail.gmail.com>
Date:   Fri, 17 Feb 2023 10:07:50 +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 11:04, Dmitry Vyukov <dvyukov@...gle.com> wrote:
>
> 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?

#syz fix: objtool: Fix ORC 'signal' propagation