linux-kernel - Re: Oops on Power8 (was Re: [PATCH v2 1/7] workqueue: make workqueue available early during boot)

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Date:   Mon, 10 Oct 2016 09:14:17 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        kernel-team@...com,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: Oops on Power8 (was Re: [PATCH v2 1/7] workqueue: make workqueue
 available early during boot)

On Mon, Oct 10, 2016 at 09:02:53AM -0400, Tejun Heo wrote:
> Hello, Michael.
> 
> On Mon, Oct 10, 2016 at 09:22:55PM +1100, Michael Ellerman wrote:
> > This patch seems to be causing one of my Power8 boxes not to boot.
> > 
> > Specifically commit 3347fa092821 ("workqueue: make workqueue available
> > early during boot") in linux-next.
> > 
> > If I revert this on top of next-20161005 then the machine boots again.
> > 
> > I've attached the oops below. It looks like the cfs_rq of p->se is NULL?
> 
> Hah, weird that it's arch dependent, or maybe it's just different
> config options.  Most likely, it's caused by workqueue_init() call
> being moved too early.  Can you please try the following patch and see
> whether the problem goes away?

And if it does, can you please post the boot log with kernel boot
option "initcall_debug=1" specified?

Thanks.

-- 
tejun