linux-kernel - Re: linux-next boot error: WARNING: workqueue cpumask: online intersect

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Date:   Fri, 8 Nov 2019 13:46:54 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Eric Biggers <ebiggers@...nel.org>,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        syzbot <syzbot+4d497898effeb1936245@...kaller.appspotmail.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: linux-next boot error: WARNING: workqueue cpumask: online
 intersect > possible intersect

On Wed, Jul 24, 2019 at 7:43 PM Tejun Heo <tj@...nel.org> wrote:
>
> On Wed, Jul 24, 2019 at 10:41:29AM -0700, Eric Biggers wrote:
> > The real boot error "general protection fault in dma_direct_max_mapping_size" is
> > fixed in mainline now.  I believe that unblocks syzbot testing, since it doesn't
> > appear to have been blocked by "WARNING: workqueue cpumask: online intersect >
> > possible intersect" by itself.
> >
> > Anyway: Tejun and Michael, any other ideas for why "WARNING: workqueue cpumask:
> > online intersect > possible intersect" is still happening?
>
> That code hasn't changed in years.  It gotta be changes in cpumask
> initialization ordering or sth like that.  The easiest way to find the
> culprit would be bisecting.  I can't get to it right now.  Anyone
> interested?

syzkaller will now ignore this warning as it happens on every boot and
masks all other boot problems:
https://github.com/google/syzkaller/commit/31b7aac4626757ae0862971db78aaa1338541227
syzbot will never remind about this again:
#syz invalid