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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ae3e8f4b264sm35814266b.102.2025.07.03.01.33.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Jul 2025 01:33:14 -0700 (PDT) Message-ID: <9586f8ff-3b34-4613-853b-0c808fcbb9d2@redhat.com> Date: Thu, 3 Jul 2025 10:33:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 5/7] selftests/mm: Fix child process exit codes in ksm_functional_tests To: Aboorva Devarajan , akpm@linux-foundation.org, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, shuah@kernel.org, pfalcato@suse.de, ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, donettom@linux.ibm.com, ritesh.list@gmail.com References: <20250703060656.54345-1-aboorvad@linux.ibm.com> <20250703060656.54345-6-aboorvad@linux.ibm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 36FB240004 X-Stat-Signature: djtkfzwxfiocmm98q7h5teabgx63pujb X-HE-Tag: 1751531601-618182 X-HE-Meta: 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 I+x2dDYE 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 03.07.25 08:06, Aboorva Devarajan wrote: > In ksm_functional_tests, test_child_ksm() returned negative values > to indicate errors. However, when passed to exit(), these were > interpreted as large unsigned values (e.g, -2 became 254), leading to > incorrect handling in the parent process. As a result, some tests > appeared to be skipped or silently failed. > > This patch changes test_child_ksm() to return positive error codes > (1, 2, 3) and updates test_child_ksm_err() to interpret them correctly. > This ensures the parent accurately detects and reports child process > failures. > > -------------- > Before patch: > -------------- > - [RUN] test_unmerge > ok 1 Pages were unmerged > ... > - [RUN] test_prctl_fork > - No pages got merged > - [RUN] test_prctl_fork_exec > ok 7 PR_SET_MEMORY_MERGE value is inherited > ... > Bail out! 1 out of 8 tests failed > - Planned tests != run tests (9 != 8) > - Totals: pass:7 fail:1 xfail:0 xpass:0 skip:0 error:0 > > -------------- > After patch: > -------------- > - [RUN] test_unmerge > ok 1 Pages were unmerged > ... > - [RUN] test_prctl_fork > - No pages got merged > not ok 7 Merge in child failed > - [RUN] test_prctl_fork_exec > ok 8 PR_SET_MEMORY_MERGE value is inherited > ... > Bail out! 2 out of 9 tests failed > - Totals: pass:7 fail:2 xfail:0 xpass:0 skip:0 error:0 > > Fixes: 6c47de3be3a0 ("selftest/mm: ksm_functional_tests: extend test case for ksm fork/exec") > Signed-off-by: Aboorva Devarajan BTW, when I run the test, I get this weird output TAP version 13 1..9 # [RUN] test_unmerge ok 1 Pages were unmerged # [RUN] test_unmerge_zero_pages ok 2 KSM zero pages were unmerged # [RUN] test_unmerge_discarded ok 3 Pages were unmerged # [RUN] test_unmerge_uffd_wp ok 4 Pages were unmerged # [RUN] test_prot_none ok 5 Pages were unmerged # [RUN] test_prctl ok 6 Setting/clearing PR_SET_MEMORY_MERGE works # [RUN] test_prctl_fork ok 7 PR_SET_MEMORY_MERGE value is inherited # [RUN] test_prctl_fork_exec ^ where is the test? # [RUN] test_prctl_unmerge ok 8 Pages were unmerged # Planned tests != run tests (9 != 8) # Totals: pass:8 fail:0 xfail:0 xpass:0 skip:0 error:0 ^ what? ok 8 PR_SET_MEMORY_MERGE value is inherited # [RUN] test_prctl_unmerge ok 9 Pages were unmerged # Totals: pass:9 fail:0 xfail:0 xpass:0 skip:0 error:0 ^ huh, what now? -- Cheers, David / dhildenb