linux-kernel - Re: [PATCH] selftests/mm: run_vmtests.sh: add missing tests

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Date: Fri, 19 Jan 2024 16:09:35 +0000
From: Ryan Roberts <ryan.roberts@....com>
To: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Shuah Khan <shuah@...nel.org>
Cc: kernel@...labora.com, linux-mm@...ck.org,
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/mm: run_vmtests.sh: add missing tests

Hi Muhammad,

Afraid this patch is causing a regression on our CI system when it turned up in
linux-next today. Additionally, 2 of thetests you have added are failing because
the scripts are not exported correctly...

On 16/01/2024 09:06, Muhammad Usama Anjum wrote:
> Add missing tests to run_vmtests.sh. The mm kselftests are run through
> run_vmtests.sh. If a test isn't present in this script, it'll not run
> with run_tests or `make -C tools/testing/selftests/mm run_tests`.
> 
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
>  tools/testing/selftests/mm/run_vmtests.sh | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
> index 246d53a5d7f2..a5e6ba8d3579 100755
> --- a/tools/testing/selftests/mm/run_vmtests.sh
> +++ b/tools/testing/selftests/mm/run_vmtests.sh
> @@ -248,6 +248,9 @@ CATEGORY="hugetlb" run_test ./map_hugetlb
>  CATEGORY="hugetlb" run_test ./hugepage-mremap
>  CATEGORY="hugetlb" run_test ./hugepage-vmemmap
>  CATEGORY="hugetlb" run_test ./hugetlb-madvise
> +CATEGORY="hugetlb" run_test ./charge_reserved_hugetlb.sh
> +CATEGORY="hugetlb" run_test ./hugetlb_reparenting_test.sh

These 2 tests are failing because the test scripts are not exported. You will
need to add them to the TEST_FILES variable in the Makefile.

> +CATEGORY="hugetlb" run_test ./hugetlb-read-hwpoison

The addition of this test causes 2 later tests to fail with ENOMEM. I suspect
its a side-effect of marking the hugetlbs as hwpoisoned? (just a guess based on
the test name!). Once a page is marked poisoned, is there a way to un-poison it?
If not, I suspect that's why it wasn't part of the standard test script in the
first place.

These are the tests that start failing:

# # ------------------------------------
# # running ./uffd-stress hugetlb 128 32
# # ------------------------------------
# # nr_pages: 64, nr_pages_per_cpu: 8
# # ERROR: context init failed (errno=12, @uffd-stress.c:254)
# # [FAIL]
# not ok 18 uffd-stress hugetlb 128 32 # exit=1
# # --------------------------------------------
# # running ./uffd-stress hugetlb-private 128 32
# # --------------------------------------------
# # nr_pages: 64, nr_pages_per_cpu: 8
# # bounces: 31, mode: rnd racing ver poll, ERROR: UFFDIO_COPY error: -12ERROR:
UFFDIO_COPY error: -12 (errno=12, @uffd-common.c:614)
# #  (errno=12, @uffd-common.c:614)
# # [FAIL]

Quickest way to repo is:

$ sudo ./run_vmtests.sh -t "userfaultfd hugetlb"

Thanks,
Ryan


>  
>  nr_hugepages_tmp=$(cat /proc/sys/vm/nr_hugepages)
>  # For this test, we need one and just one huge page