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

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Message-ID: <728915db-592b-997f-6970-464cc59441d7@i-love.sakura.ne.jp>
Date:   Wed, 1 Jul 2020 19:04:15 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Luis Chamberlain <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

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.

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