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From: SeongJae Park <sj@kernel.org>
To: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: sj@kernel.org,
	linux-mm@kvack.org,
	akpm@linux-foundation.org,
	damon@lists.linux.dev
Subject: Re: DAMON KUNIT test failure in latest mm-everything
Date: Sun,  2 Oct 2022 19:36:56 +0000
Message-Id: <20221002193656.8300-1-sj@kernel.org>
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In-Reply-To: <Yzk8rfGNTTiU3tH0@hyeyoo>
References: 
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Hi Hyeonggon,

On Sun, 2 Oct 2022 16:24:29 +0900 Hyeonggon Yoo <42.hyeyoo@gmail.com> wrote:

> On Sun, Oct 02, 2022 at 01:24:23PM +0900, Hyeonggon Yoo wrote:
> > Hi guys, yesterday I just built and booted latest mm-everything,
> > and I got following report from KUNIT test.
> > 
> > Environment:
> > - x86_64, gcc 11.2.0
> > - mm-everything (tag: mm-everything-2022-10-01-01-55)
> > - config attached
> > 
> > Report (stacktrace decoded):
> 
> FYI, below is the bad commit from git bisection ;)
> 
> Thanks!
> 
> 065530b966a42d63f214ba40427dc8d00345f573 is the first bad commit
> commit 065530b966a42d63f214ba40427dc8d00345f573
> Author: SeongJae Park <sj@kernel.org>
> Date:   Fri Sep 9 20:28:57 2022 +0000
> 
> mm/damon/core-test: test damon_set_regions
> 
> Preceding commit fixes a bug in 'damon_set_regions()', which allows holes
> in the new monitoring target ranges.  This commit adds a kunit test case
> for the problem to avoid any regression.

Thank you so much for this kind report!  I just sent a patch[1] for this.  It
should fix this issue.  BTW, please note that the real issue was there even
before the kunit commit, but the kunit commit was the first commit that
triggers the issue.

[1] https://lore.kernel.org/damon/20221002193130.8227-1-sj@kernel.org/


Thanks,
SJ
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