linux-kernel - Re: kernel panic: corrupted stack end in wb

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Date:   Sun, 17 Mar 2019 13:49:01 -0700
From:   syzbot <syzbot+ec1b7575afef85a0e5ca@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, aryabinin@...tuozzo.com, cai@....pw,
        davem@...emloft.net, dvyukov@...gle.com, guro@...com,
        hannes@...xchg.org, jbacik@...com, ktkhai@...tuozzo.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-sctp@...r.kernel.org, mgorman@...hsingularity.net,
        mhocko@...e.com, netdev@...r.kernel.org, nhorman@...driver.com,
        shakeelb@...gle.com, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk, vyasevich@...il.com, willy@...radead.org
Subject: Re: kernel panic: corrupted stack end in wb_workfn

syzbot has bisected this bug to:

commit c981f254cc82f50f8cb864ce6432097b23195b9c
Author: Al Viro <viro@...iv.linux.org.uk>
Date:   Sun Jan 7 18:19:09 2018 +0000

     sctp: use vmemdup_user() rather than badly open-coding memdup_user()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=137bcecf200000
start commit:   c981f254 sctp: use vmemdup_user() rather than badly open-c..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=10fbcecf200000
console output: https://syzkaller.appspot.com/x/log.txt?x=177bcecf200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5e7dc790609552d7
dashboard link: https://syzkaller.appspot.com/bug?extid=ec1b7575afef85a0e5ca
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a9a84b400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17199bb3400000

Reported-by: syzbot+ec1b7575afef85a0e5ca@...kaller.appspotmail.com
Fixes: c981f254 ("sctp: use vmemdup_user() rather than badly open-coding  
memdup_user()")