linux-kernel - Re: INFO: rcu detected stall in __do

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Message-ID: <20190817071440.GD12733@vkoul-mobl.Dlink>
Date:   Sat, 17 Aug 2019 12:44:40 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     syzbot <syzbot+6593c6b8c8b66a07cd98@...kaller.appspotmail.com>,
        alsa-devel@...a-project.org, bp@...en8.de,
        gregkh@...uxfoundation.org, hpa@...or.com,
        linux-kernel@...r.kernel.org, mingo@...hat.com, nstange@...e.de,
        pierre-louis.bossart@...ux.intel.com, sanyog.r.kale@...el.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        x86@...nel.org, yakui.zhao@...el.com
Subject: Re: INFO: rcu detected stall in __do_softirq

On 16-08-19, 09:55, Srinivas Kandagatla wrote:
> 
> 
> On 16/08/2019 01:10, syzbot wrote:
> > syzbot has bisected this bug to:
> > 
> > commit 2aeac95d1a4cc85aae57ab842d5c3340df0f817f
> > Author: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> > Date:   Tue Jun 11 10:40:41 2019 +0000
> > 
> >      soundwire: add module_sdw_driver helper macro
> 
> Not sure how adding a macro with no users triggers this rcu stall.

And config used doesn't have soundwire set :D
> 
> BTW this was in mainline since rc1.

This is caused by something else!

> 
> --srini
> 
> > 
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=114b45ee600000
> > start commit:   882e8691 Add linux-next specific files for 20190801
> > git tree:       linux-next
> > final crash:    https://syzkaller.appspot.com/x/report.txt?x=134b45ee600000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=154b45ee600000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=466b331af3f34e94
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=6593c6b8c8b66a07cd98
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16b216b2600000
> > 
> > Reported-by: syzbot+6593c6b8c8b66a07cd98@...kaller.appspotmail.com
> > Fixes: 2aeac95d1a4c ("soundwire: add module_sdw_driver helper macro")
> > 
> > For information about bisection process see:
> > https://goo.gl/tpsmEJ#bisection

-- 
~Vinod