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

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Date:   Mon, 9 Oct 2017 14:54:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Fengguang Wu <fengguang.wu@...el.com>
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 08:21:13PM +0800, Fengguang Wu wrote:
> > > From e7840ad76515f0b5061fcdd098b57b7c01b61482 Mon Sep 17 00:00:00 2001
> > > Message-Id: <e7840ad76515f0b5061fcdd098b57b7c01b61482.1507215196.git.jpoimboe@...hat.com>
> > > From: Josh Poimboeuf <jpoimboe@...hat.com>
> > > Date: Thu, 5 Oct 2017 09:43:59 -0500
> > > Subject: [PATCH 1/2] unwinder fixes
> > > 
> > > ---
> > >  arch/x86/kernel/unwind_frame.c | 33 ++++++++++++++++++++++++++++++---
> 
> I just test 316 boots and see 7 WARNINGs:
> 
> [  404.948035] WARNING: kernel stack frame pointer at c6ea3ecd in init:212 has bad value   (null)
> [  298.118383] WARNING: kernel stack frame pointer at cde07dad in init:1 has bad value bc000000
> [  112.848677] WARNING: kernel stack frame pointer at cde07dbd in swapper/0:1 has bad value c2000000
> [  127.942417] WARNING: kernel stack frame pointer at cf95de71 in rb_producer:50 has bad value 03cf95de
> [    4.736938] WARNING: kernel stack frame pointer at bf643d59 in kworker/0:1:15 has bad value b5000000
> [  308.260066] WARNING: kernel stack frame pointer at bde07da5 in udevd:155 has bad value b5bfa17b
> 
> [  277.473596] WARNING: CPU: 0 PID: 520 at kernel/locking/lockdep.c:3841 check_flags+0x119/0x1b0

That's much better than NULL pointer derefs. Is there any chance I could
get your userspace image such that I can try and repro?

It appears to run trinity..

And you're still using the same .config from the original report?