linux-kernel - Re: i386: selftests: vm: compaction_test: BUG: kernel NULL pointer dereference, address: 00000000

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Date:   Mon, 13 Apr 2020 10:53:12 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, linux-mm <linux-mm@...ck.org>
Cc:     lkft-triage@...ts.linaro.org, Shuah Khan <shuah@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Leonardo Bras <leonardo@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Peter Xu <peterx@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jules Irenge <jbi.octave@...il.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Rik van Riel <riel@...riel.com>,
        Hugh Dickins <hughd@...gle.com>,
        Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Mateusz Nosek <mateusznosek0@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: i386: selftests: vm: compaction_test: BUG: kernel NULL pointer
 dereference, address: 00000000

On 4/11/20 11:54 PM, Naresh Kamboju wrote:
> On Linux mainline kernel 5.6.0 running kselftest vm compaction_test on i386
>  kernel running on x86_64 devices we have noticed this Kernel BUG followed by
> Kernel panic.

Any chance we could talk you into doing a bisect on this sucker?

The "Bad swap file entry" message could be a lot of things.