{"id":2222539,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2222539/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/patch/6215241a-07c4-4eed-8549-0e0afc2fc096@linux.ibm.com/","project":{"id":59,"url":"http://patchwork.ozlabs.org/api/1.2/projects/59/?format=json","name":"Linux Test Project development","link_name":"ltp","list_id":"ltp.lists.linux.it","list_email":"ltp@lists.linux.it","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<6215241a-07c4-4eed-8549-0e0afc2fc096@linux.ibm.com>","list_archive_url":null,"date":"2026-04-12T16:36:37","name":"mmap: fix intermittent OOM kill of test parent in mmap22","commit_ref":null,"pull_url":null,"state":"changes-requested","archived":false,"hash":"b9808bb25b855a58c72d789410fd90e1226c2860","submitter":{"id":93035,"url":"http://patchwork.ozlabs.org/api/1.2/people/93035/?format=json","name":"Soma Das","email":"somadas1@linux.ibm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ltp/patch/6215241a-07c4-4eed-8549-0e0afc2fc096@linux.ibm.com/mbox/","series":[{"id":499618,"url":"http://patchwork.ozlabs.org/api/1.2/series/499618/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/list/?series=499618","date":"2026-04-12T16:36:37","name":"mmap: fix intermittent OOM kill of test parent in mmap22","version":1,"mbox":"http://patchwork.ozlabs.org/series/499618/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2222539/comments/","check":"fail","checks":"http://patchwork.ozlabs.org/api/patches/2222539/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=OlxQ72AM;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; 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Set the parent to -1000 before\nfork() to protect the test harness, and set the child to +1000\nimmediately after fork() to make it the unambiguous OOM victim.\nAdd #include for O_WRONLY used by the helper.\n\nSigned-off-by: Soma Das \n---\n  testcases/kernel/syscalls/mmap/mmap22.c | 37 ++++++++++++++++++++++++-\n  1 file changed, 36 insertions(+), 1 deletion(-)","diff":"diff --git a/testcases/kernel/syscalls/mmap/mmap22.c \nb/testcases/kernel/syscalls/mmap/mmap22.c\nindex 0b95c578f..02c363893 100644\n--- a/testcases/kernel/syscalls/mmap/mmap22.c\n+++ b/testcases/kernel/syscalls/mmap/mmap22.c\n@@ -17,6 +17,7 @@\n  #include \n  #include \n  #include \n+#include \n  #include \n  #include \n  #include \n@@ -31,6 +32,24 @@ static struct tst_cg_group *cg_child;\n  static pid_t child;\n  static int page_size;\n\n+static void set_oom_score_adj(int value)\n+{\n+    char buf[16];\n+    int fd, len;\n+\n+    fd = open(\"/proc/self/oom_score_adj\", O_WRONLY);\n+    if (fd < 0) {\n+        tst_res(TWARN | TERRNO, \"Failed to open /proc/self/oom_score_adj\");\n+        return;\n+    }\n+\n+    len = snprintf(buf, sizeof(buf), \"%d\", value);\n+    if (write(fd, buf, len) != len)\n+        tst_res(TWARN | TERRNO, \"Failed to write oom_score_adj=%d\", value);\n+\n+    close(fd);\n+}\n+\n  static void stress_child(void)\n  {\n      for (;;) {\n@@ -63,9 +82,25 @@ static void test_mmap(void)\n\n      vec = SAFE_MALLOC(npages);\n\n+    /*\n+     * Protect the parent (test harness) from the OOM killer. Both parent\n+     * and child share the same memcg, so without an explicit hint the OOM\n+     * killer picks based on heuristics that can favour the parent.\n+     */\n+    set_oom_score_adj(-1000);\n+\n      child = SAFE_FORK();\n-    if (!child)\n+    if (!child) {\n+        /*\n+         * Make the child the preferred OOM victim. If OOM fires while\n+         * the stress worker is filling memory, the kernel must kill the\n+         * child (stress worker) and not the parent (test harness).\n+         * oom_score_adj=1000 is the maximum, guaranteeing this process\n+         * is chosen first within the cgroup.\n+         */\n+        set_oom_score_adj(1000);\n          stress_child();\n+    }\n\n      for (;;) {\n          if (!tst_remaining_runtime()) {\n","prefixes":[]}