linux-kernel - Re: WARNING: ODEBUG bug in free

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Date:   Thu, 11 Oct 2018 21:05:41 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+71aff6ea121ffefc280f@...kaller.appspotmail.com>,
        dledford@...hat.com, Jason Gunthorpe <jgg@...pe.ca>,
        swise@...ngridcomputing.com, markb@...lanox.com,
        linux-rdma@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>, guro@...com,
        Kees Cook <keescook@...omium.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Marcos Souza <marcos.souza.org@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Will Drewry <wad@...omium.org>
Subject: Re: WARNING: ODEBUG bug in free_task

On Wed, Oct 10, 2018 at 02:59:38PM +0200, Dmitry Vyukov wrote:
> On Tue, Oct 9, 2018 at 7:14 PM, syzbot
> <syzbot+71aff6ea121ffefc280f@...kaller.appspotmail.com> wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    ae16eea39a86 Add linux-next specific files for 20181008
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=16a493b9400000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=42525ce985d1a955
> > dashboard link: https://syzkaller.appspot.com/bug?extid=71aff6ea121ffefc280f
> > compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14567ae6400000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14baa25e400000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+71aff6ea121ffefc280f@...kaller.appspotmail.com
>
> This looks the same as:
>
> #syz dup: WARNING in __put_task_struct (2)
>
> The reproducer is all RDMA and also some task refcounting bug.
>
> +RDMA maintainers

Thanks, amazing reproducer, I'm looking on it now.

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