linux-kernel - Re: [lockdep] b09be676e0 BUG: unable to handle kernel NULL pointer dereference at 000001f2

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Message-ID: <20171009154757.7mwxbglodb2b6crk@wfg-t540p.sh.intel.com>
Date:   Mon, 9 Oct 2017 23:47:57 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Byungchul Park <byungchul.park@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        LKP <lkp@...org>
Subject: Re: [lockdep] b09be676e0 BUG: unable to handle kernel NULL pointer
 dereference at 000001f2

On Mon, Oct 09, 2017 at 05:44:46PM +0200, Peter Zijlstra wrote:
>On Mon, Oct 09, 2017 at 11:41:30PM +0800, Fengguang Wu wrote:
>> > > [  187.855027] init: plymouth-splash main process (418) terminated with status 1
>> > > [  187.953296] init: networking main process (419) terminated with status 1
>> > > [  191.697721] ------------[ cut here ]------------
>> > > [  191.699318] WARNING: CPU: 0 PID: 424 at kernel/locking/lockdep.c:3928 check_flags+0x119/0x1b0
>> >
>> > Would still like to get around sorting that one though.
>>
>> Sure. It looks not easy to bisect, anyway I just queued the job.
>
>Oh no worries; I'd just like to be able to reproduce locally, then I'll
>prod it with a sharp stick.

OK.

>If you could get me that userspace image somehow, that'd be grand.

It's all the same image, reproduce script and kconfig that I just sent
you in the earlier email today.

Thanks,
Fengguang