linux-kernel - Re: BUG: kernel NULL pointer dereference, address: 00000004

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Date:   Tue, 17 May 2022 15:27:08 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
CC:     open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        David Howells <dhowells@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        SeongJae Park <sj@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        Davidlohr Bueso <dave@...olabs.net>
Subject: Re: BUG: kernel NULL pointer dereference, address: 00000004 -
 mas_update_gap

* Naresh Kamboju <naresh.kamboju@...aro.org> [220516 02:35]:
> While running LTP sched tests on i386 the following kernel BUG noticed on
> Linux next-20220513 [1].
> 
...

> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> 
> metadata:
>   git_ref: master
>   git_repo: ''
>   git_sha: 1e1b28b936aed946122b4e0991e7144fdbbfd77e
>   git_describe: next-20220513
>   kernel_version: 5.18.0-rc6
>   kernel-config: https://builds.tuxbuild.com/296PiI1oM7N6Vk7m9lxuipmXW7B/config
>   build-url: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next/-/pipelines/538244935
>   artifact-location: https://builds.tuxbuild.com/296PiI1oM7N6Vk7m9lxuipmXW7B
>   toolchain: gcc-11
> 
> --
> Linaro LKFT
> https://lkft.linaro.org
> 
> [1] https://lkft.validation.linaro.org/scheduler/job/5021335#L1718


I was able to reproduce this issue with ltp running:
"./runltp -p -q -f sched"

I have sent a fix out [1] that allows the test to execute on i386 qemu.

Thanks,
Liam

1. https://lore.kernel.org/linux-mm/20220517152209.3486724-1-Liam.Howlett@oracle.com/