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

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Date:   Mon, 9 Oct 2017 20:21:13 +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 12:50:55PM +0200, Peter Zijlstra wrote:
>> Fengguang, if you're still listening, could you please rerun the tests
>> on top of ce07a9415f26, with the attached patches also applied?
>
>Ping!? it would be very good to get feedback on this asap.

Sorry for the delay!

>> 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

Attached are 2 dmesgs for the 2 types of warnings.

Regards,
Fengguang

View attachment "dmesg-quantal-intel12-14:20171009201232:i386-randconfig-i0-201739:4.13.0-rc4-00171-g4b88a5c:1" of type "text/plain" (80454 bytes)

View attachment "dmesg-yocto-kbuild-3:20171009200946:i386-randconfig-i0-201739:4.13.0-rc4-00171-g4b88a5c:1" of type "text/plain" (57230 bytes)