linux-kernel - Re: INFO: task hung in request_key

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Date:   Wed, 1 Jul 2020 12:20:30 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Christoph Hellwig <hch@...radead.org>, mcgrof@...nel.org
Cc:     syzbot <syzbot+46c77dc7e98c732de754@...kaller.appspotmail.com>,
        dhowells@...hat.com, jarkko.sakkinen@...ux.intel.com,
        jmorris@...ei.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, serge@...lyn.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: INFO: task hung in request_key_tag

On Wed, Jul 01, 2020 at 07:04:15PM +0900, Tetsuo Handa wrote:
> I suspect commit 9e9b47d6bbe9df65 ("umh: fix processed error when UMH_WAIT_PROC is used").
> Maybe the change in kernel/umh.c and/or security/keys/request_key.c made by that commit is
> affecting call_usermodehelper_keys() == 0 case when complete_request_key() is called.

That patch has been dropped for now due to another reported issue
bisected to it and even though we have not root caused that issue [0].

It would be good to have a reproducer for this reported issue as well,
but I should also point out a regression which Naresh reported is fixed
recently by a posted patch [1] by Herbert Xu. It would be good if you
can test with that patch posted by Herbert.

[0] https://lkml.kernel.org/r/20200623141157.5409-1-borntraeger@de.ibm.com          
[1] https://lkml.kernel.org/r/20200626062948.GA25285@gondor.apana.org.au

  Luis

> 
> On 2020/07/01 16:53, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following crash on:
> > 
> > HEAD commit:    c28e58ee Add linux-next specific files for 20200629
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=17925a9d100000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=dcd26bbca17dd1db
> > dashboard link: https://syzkaller.appspot.com/bug?extid=46c77dc7e98c732de754
> > compiler:       gcc (GCC) 10.1.0-syz 20200507
> > 
> > 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+46c77dc7e98c732de754@...kaller.appspotmail.com