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

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Message-ID: <63c0dc1e-323d-d46e-2d4a-b5b6d6916042@linaro.org>
Date:   Fri, 16 Aug 2019 09:55:49 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     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,
        vkoul@...nel.org, x86@...nel.org, yakui.zhao@...el.com
Subject: Re: INFO: rcu detected stall in __do_softirq



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.

BTW this was in mainline since rc1.

--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