linux-kernel - Re: linux-next build error (8)

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Date:   Fri, 20 Mar 2020 16:08:22 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        syzbot <syzbot+792dec47d693ccdc05a0@...kaller.appspotmail.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: linux-next build error (8)

On Thu, Mar 19, 2020 at 08:13:35AM +0100, 'Dmitry Vyukov' via syzkaller-bugs wrote:
> On Wed, Mar 18, 2020 at 10:41 PM Paul E. McKenney <paulmck@...nel.org> wrote:
> >
> > On Wed, Mar 18, 2020 at 09:54:07PM +0100, Dmitry Vyukov wrote:
> > > On Wed, Mar 18, 2020 at 5:57 PM syzbot
> > > <syzbot+792dec47d693ccdc05a0@...kaller.appspotmail.com> wrote:
> > > >
> > > > Hello,
> > > >
> > > > syzbot found the following crash on:
> > > >
> > > > HEAD commit:    47780d78 Add linux-next specific files for 20200318
> > > > git tree:       linux-next
> > > > console output: https://syzkaller.appspot.com/x/log.txt?x=14228745e00000
> > > > kernel config:  https://syzkaller.appspot.com/x/.config?x=b68b7b89ad96c62a
> > > > dashboard link: https://syzkaller.appspot.com/bug?extid=792dec47d693ccdc05a0
> > > > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > > >
> > > > 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+792dec47d693ccdc05a0@...kaller.appspotmail.com
> > > >
> > > > kernel/rcu/tasks.h:1070:37: error: 'rcu_tasks_rude' undeclared (first use in this function); did you mean 'rcu_tasks_qs'?
> > >
> > > +rcu maintainers
> >
> > The kbuild test robot beat you to it, and apologies for the hassle.
> > Fixed in -rcu on current "dev" branch.
> 
> If the kernel dev process would only have a way to avoid dups from all
> test systems...

We could make a mailing list for recording it, and then just grep the
mailbox for the file and function.

Or we could just assume that kbuild is going to find almost all the
build errors.

regards,
dan carpenter