linux-kernel - Re: [PATCH 0/1] selftest/mm/hugetlb: SIGBUS on stolen page

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Date: Fri, 5 Jan 2024 09:40:41 -0800
From: Breno Leitao <leitao@...ian.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: riel@...riel.com, linux-mm@...ck.org, vegard.nossum@...cle.com,
	rppt@...nel.org, songmuchun@...edance.com, shy828301@...il.com,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] selftest/mm/hugetlb: SIGBUS on stolen page

On Fri, Jan 05, 2024 at 08:42:38AM -0800, Andrew Morton wrote:
> On Fri,  5 Jan 2024 07:54:18 -0800 Breno Leitao <leitao@...ian.org> wrote:
> 
> > This test case triggers a race between madvise(MADV_DONTNEED) and
> > mmap() in a single huge page, which got stolen (while reserved).
> > 
> > Once the only page is stolen, the memory previously mmaped (and
> > madvise(MADV_DONTNEED) got a SIGBUS when accessed.
> > 
> > I am not adding this test to the un_vmtests.sh scripts, since this test
> > fails at upstream.
> 
> Oh.  Is a fix for this in the pipeline?  If so, I assume that once the
> fix is merged, we enable this test in run_vmtests?

The fix is not ready yet. As soon as the fix lands, I will enable the
test in run_vmtests.