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Thu, 3 Jul 2025 08:51:27 GMT Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7EBBB58043; Thu, 3 Jul 2025 08:51:32 +0000 (GMT) Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DB02258063; Thu, 3 Jul 2025 08:51:24 +0000 (GMT) Received: from [9.109.245.113] (unknown [9.109.245.113]) by smtpav06.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 3 Jul 2025 08:51:24 +0000 (GMT) Message-ID: <7b78974b-6841-4280-89c1-01bd835d4f27@linux.ibm.com> Date: Thu, 3 Jul 2025 14:21:22 +0530 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: David Hildenbrand , 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, ritesh.list@gmail.com References: <20250703060656.54345-1-aboorvad@linux.ibm.com> <20250703060656.54345-6-aboorvad@linux.ibm.com> <9586f8ff-3b34-4613-853b-0c808fcbb9d2@redhat.com> Content-Language: en-US From: Donet Tom In-Reply-To: <9586f8ff-3b34-4613-853b-0c808fcbb9d2@redhat.com> Content-Type: text/plain; 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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? > The problem with the exec test is that it uses its own binary to exec.         } else if (child_pid == 0) {                 char *prg_name = "./ksm_functional_tests";                 char *argv_for_program[] = { prg_name, FORK_EXEC_CHILD_PRG_NAME, NULL };                 execv(prg_name, argv_for_program);                 return;         } So we should run it on the same directory where the binary present.