linux-kernel - Re: [REGRESSION] Null pointer dereference while shrinking zswap

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Date: Wed, 17 Apr 2024 00:29:06 +0200
From: Christian Heusel <christian@...sel.eu>
To: Nhat Pham <nphamcs@...il.com>
Cc: Seth Jennings <sjenning@...hat.com>, Dan Streetman <ddstreet@...e.org>, 
	Vitaly Wool <vitaly.wool@...sulko.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, David Runge <dave@...epmap.de>, 
	"Richard W.M. Jones" <rjones@...hat.com>, Mark W <instruform@...il.com>, regressions@...ts.linux.dev, 
	Johannes Weiner <hannes@...xchg.org>, Yosry Ahmed <yosryahmed@...gle.com>, 
	Chengming Zhou <chengming.zhou@...ux.dev>
Subject: Re: [REGRESSION] Null pointer dereference while shrinking zswap

On 24/04/16 03:14PM, Nhat Pham wrote:
> Is this one of the kernel versions that was broken? That looks a bit
> odd, as zswap shrinker landed on 6.8...

Yes that is the build at commit b5ba474f3f51 ("zswap: shrink zswap pool
based on memory pressure") which is one of the kernel versions that is
broken, although the version string seems a bit confusing. This is due
to the build script invoking "make -s kernelrelease" which gives the
following:

  $ git checkout b5ba474f3f51
  [...]
  $ make -s kernelrelease
  6.7.0-rc4-00158-gb5ba474f3f51

The commit is contained in v6.8+ only as you say, so its just confusing
in the version string:

  $ git tag --contains b5ba474f3f51 | grep -v next
  v6.8
  v6.8-rc1
  v6.8-rc2
  v6.8-rc3
  v6.8-rc4
  v6.8-rc5
  v6.8-rc6
  v6.8-rc7
  v6.9-rc1
  v6.9-rc2
  v6.9-rc3
  v6.9-rc4

Please see my initial report for the detailed bisection results and the
link there to the bisection log.

Cheers and thanks for looking into this!
Christian

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