linux-kernel - Re: inconsistent lock state in ima_process_queued

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Date:   Tue, 14 Jan 2020 09:56:52 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+a4a503d7f37292ae1664@...kaller.appspotmail.com>,
        Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
Cc:     Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        linux-integrity@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: inconsistent lock state in ima_process_queued_keys

On Tue, 2020-01-14 at 14:58 +0100, Dmitry Vyukov wrote:
> On Tue, Jan 14, 2020 at 2:56 PM syzbot
> <syzbot+a4a503d7f37292ae1664@...kaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    1b851f98 Add linux-next specific files for 20200114
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=12bcbb25e00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=3e7d9cf7ebfa08ad
> > dashboard link: https://syzkaller.appspot.com/bug?extid=a4a503d7f37292ae1664
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+a4a503d7f37292ae1664@...kaller.appspotmail.com
> 
> +Lakshmi, you seem to have submitted a number of changes to this file recently.
> 
> This completely breaks linux-next testing for us, every kernel crashes
> a few minutes after boot.
> 
> 2020/01/14 14:45:00 vm-26: crash: inconsistent lock state in
> ima_process_queued_keys

Yikes!  Are you running with an IMA policy?  I assume this is being
caused by commit 8f5d2d06f217 ("IMA: Defined timer to free queued
keys".  Does reverting it prevent this from happening?

Mimi