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

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To: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>, open list <linux-kernel@xxxxxxxxxxxxxxx>, "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@xxxxxxxxxxxxxxx>, linux-mm <linux-mm@xxxxxxxxx>
Subject: Re: i386: selftests: vm: compaction_test: BUG: kernel NULL pointer dereference, address: 00000000
From: Dave Hansen <dave.hansen@xxxxxxxxx>
Date: Mon, 13 Apr 2020 10:53:12 -0700
Cc: lkft-triage@xxxxxxxxxxxxxxxx, Shuah Khan <shuah@xxxxxxxxxx>, Anders Roxell <anders.roxell@xxxxxxxxxx>, Christophe Leroy <christophe.leroy@xxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Leonardo Bras <leonardo@xxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Jules Irenge <jbi.octave@xxxxxxxxx>, "Huang, Ying" <ying.huang@xxxxxxxxx>, Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Minchan Kim <minchan@xxxxxxxxxx>, Mel Gorman <mgorman@xxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Mateusz Nosek <mateusznosek0@xxxxxxxxx>, Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>
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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.

References:
- i386: selftests: vm: compaction_test: BUG: kernel NULL pointer dereference, address: 00000000
  - From: Naresh Kamboju

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