netdev - Re: WARNING in compat_copy

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Message-Id: <0E15851D-59E4-455D-985E-65F066E7A85A@amacapital.net>
Date:   Sun, 14 Apr 2019 13:08:09 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     syzbot <syzbot+659574e7bcc7f7eb4df7@...kaller.appspotmail.com>
Cc:     alexl@...hat.com, bridge@...ts.linux-foundation.org,
        coreteam@...filter.org, cosimo@...lessm.com, davem@...emloft.net,
        dvyukov@...gle.com, fw@...len.de, kadlec@...ckhole.kfki.hu,
        libc-alpha@...rceware.org, linux-kernel@...r.kernel.org,
        luto@...nel.org, mingo@...nel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, nicholson@...lessm.com,
        pablo@...filter.org, peterz@...radead.org, raji@...ux.vnet.ibm.com,
        stephen@...workplumber.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, torvalds@...ux-foundation.org,
        tuliom@...ux.vnet.ibm.com
Subject: Re: WARNING in compat_copy_entries (2)

This is likely a confused bisection.  I bet that reverting this patch breaks your test but has nothing to do with the bug. Try reproducing with socketcall() to bisect farther.

--Andy

> On Apr 14, 2019, at 12:20 PM, syzbot <syzbot+659574e7bcc7f7eb4df7@...kaller.appspotmail.com> wrote:
> 
> syzbot has bisected this bug to:
> 
> commit 9dea5dc921b5f4045a18c63eb92e84dc274d17eb
> Author: Andy Lutomirski <luto@...nel.org>
> Date:   Tue Jul 14 22:24:24 2015 +0000
> 
>    x86/entry/syscalls: Wire up 32-bit direct socket calls
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1736919f200000
> start commit:   ce380619 Merge tag 'please-pull-ia64_misc' of git://git.ke..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10b6919f200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=36fbc8c97ef985d3
> dashboard link: https://syzkaller.appspot.com/bug?extid=659574e7bcc7f7eb4df7
> userspace arch: i386
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=179b4d8b800000
> 
> Reported-by: syzbot+659574e7bcc7f7eb4df7@...kaller.appspotmail.com
> Fixes: 9dea5dc921b5 ("x86/entry/syscalls: Wire up 32-bit direct socket calls")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection