linux-kernel - Re: [rtc] Re: BUG: workqueue lockup (4)

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Message-ID: <20190611065940.GI25472@piout.net>
Date:   Tue, 11 Jun 2019 08:59:40 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Jiwei Sun <jiwei.sun@...driver.com>, linux-rtc@...r.kernel.org,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+08116743f8ad6f9a6de7@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [rtc] Re: BUG: workqueue lockup (4)

On 10/06/2019 16:49:59-0700, Eric Biggers wrote:
> On Sun, Oct 07, 2018 at 09:39:18PM +0200, Alexandre Belloni wrote:
> > Hi,
> > 
> > On 07/10/2018 14:18:31+0200, Dmitry Vyukov wrote:
> > > On Sun, Oct 7, 2018 at 2:15 PM, syzbot
> > > <syzbot+08116743f8ad6f9a6de7@...kaller.appspotmail.com> wrote:
> > > > Hello,
> > > >
> > > > syzbot found the following crash on:
> > > >
> > > > HEAD commit:    c1d84a1b42ef Merge git://git.kernel.org/pub/scm/linux/kern..
> > > > git tree:       upstream
> > > > console output: https://syzkaller.appspot.com/x/log.txt?x=14c5f491400000
> > > > kernel config:  https://syzkaller.appspot.com/x/.config?x=c0af03fe452b65fb
> > > > dashboard link: https://syzkaller.appspot.com/bug?extid=08116743f8ad6f9a6de7
> > > > compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> > > > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14514a6e400000
> > > > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1025ebb9400000
> > > 
> > > The reproducer seems to be all about rtc. So +rtc maintainers.
> > > 
> > 
> > It seems to be that bug:
> > http://patchwork.ozlabs.org/patch/898552/
> > 
> > I'm pretty sure the fix is not correct though and didn't have the time
> > to work on a proper fix.
> > 
> 
> Is there any plan to actually fix this?  Because this bug is still open, syzbot
> isn't able to report "workqueue lockup" bugs elsewhere in the kernel.
> 

This is still on my radar.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com