netdev - Re: WARNING: ODEBUG bug in __do

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Message-ID: <87v9h5vfdl.fsf@nanos.tec.linutronix.de>
Date:   Wed, 26 Aug 2020 13:03:02 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     syzbot <syzbot+51c9bdfa559769d2f897@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, anna.schumaker@...app.com,
        bfields@...ldses.org, bp@...en8.de, davem@...emloft.net,
        douly.fnst@...fujitsu.com, hpa@...or.com, jlayton@...nel.org,
        konrad.wilk@...cle.com, len.brown@...el.com,
        linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
        mingo@...nel.org, mingo@...hat.com, netdev@...r.kernel.org,
        paulmck@...nel.org, peterz@...radead.org, puwen@...on.cn,
        rafael.j.wysocki@...el.com, syzkaller-bugs@...glegroups.com,
        trond.myklebust@...merspace.com, trond.myklebust@...marydata.com,
        vbabka@...e.cz, x86@...nel.org, David Howells <dhowells@...hat.com>
Subject: Re: WARNING: ODEBUG bug in __do_softirq

On Wed, Aug 26 2020 at 01:54, syzbot wrote:

Cc+: David Howells

> syzbot has found a reproducer for the following issue on:
>
> HEAD commit:    3a00d3df Add linux-next specific files for 20200825
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15080fa9900000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9ef0a5f95935d447
> dashboard link: https://syzkaller.appspot.com/bug?extid=51c9bdfa559769d2f897
> compiler:       gcc (GCC) 10.1.0-syz 20200507
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17927a2e900000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=132b8ede900000
>
> The issue was bisected to:
>
> commit 5b317cbf2bcb85a1e96ce87717cb991ecab1dd4d
> Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Date:   Fri Feb 22 09:17:11 2019 +0000
>
>     Merge branch 'pm-cpufreq-fixes'
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=171ead5d200000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=149ead5d200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=109ead5d200000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+51c9bdfa559769d2f897@...kaller.appspotmail.com
> Fixes: 5b317cbf2bcb ("Merge branch 'pm-cpufreq-fixes'")
>
> ------------[ cut here ]------------
> ODEBUG: free active (active state 0) object type: work_struct hint: afs_manage_cell+0x0/0x11c0 fs/afs/cell.c:498

AFS is leaking an active work struct in a to be freed data struct.

Thanks,

        tglx