linux-kernel - Re: general protection fault in khugepaged

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Message-ID: <0000000000008ad07505aaaad631@google.com>
Date:   Fri, 17 Jul 2020 15:40:04 -0700
From:   syzbot <syzbot+ed318e8b790ca72c5ad0@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org, william.kucharski@...cle.com,
        yang.shi@...ux.alibaba.com, ziy@...dia.com
Subject: Re: general protection fault in khugepaged

syzbot has bisected this issue to:

commit ffe945e633b527d5a4577b42cbadec3c7cbcf096
Author: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Date:   Wed Jun 3 23:00:09 2020 +0000

    khugepaged: do not stop collapse if less than half PTEs are referenced

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17356c2f100000
start commit:   e44f65fd xen-netfront: remove redundant assignment to vari..
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=14b56c2f100000
console output: https://syzkaller.appspot.com/x/log.txt?x=10b56c2f100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=829871134ca5e230
dashboard link: https://syzkaller.appspot.com/bug?extid=ed318e8b790ca72c5ad0
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=113406a7100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=175597d3100000

Reported-by: syzbot+ed318e8b790ca72c5ad0@...kaller.appspotmail.com
Fixes: ffe945e633b5 ("khugepaged: do not stop collapse if less than half PTEs are referenced")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection