[syzbot] kernel panic: corrupted stack end in openat

[Russell King - ARM Linux admin]

On Tue, Mar 16, 2021 at 08:59:17AM +0100, Dmitry Vyukov wrote:
> On Tue, Mar 16, 2021 at 8:18 AM syzbot
> <syzbot+0b06ef9b44d00d600183 at syzkaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    1e28eed1 Linux 5.12-rc3
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=167535e6d00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=e0cee1f53de33ca3
> > dashboard link: https://syzkaller.appspot.com/bug?extid=0b06ef9b44d00d600183
> > userspace arch: arm
> >
> > 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+0b06ef9b44d00d600183 at syzkaller.appspotmail.com
> 
> +arm32 maintainer
> I think this is a real stack overflow on arm32, the stack is indeed deep.

There's no way to know for sure because there's no indication of the
stack pointer in this, so we don't know how much space remains.
Therefore we don't know whether this is something in the dumped
path, or an interrupt causing it.

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