From 432b1de0de02a83f64695e69a2d83cbee10c236f Mon Sep 17 00:00:00 2001 From: Yafang Shao Date: Fri, 28 Jun 2019 12:06:59 -0700 Subject: [PATCH] mm/oom_kill.c: fix uninitialized oc->constraint In dump_oom_summary() oc->constraint is used to show oom_constraint_text, but it hasn't been set before. So the value of it is always the default value 0. We should inititialize it before. Bellow is the output when memcg oom occurs, before this patch: oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null), cpuset=/,mems_allowed=0,oom_memcg=/foo,task_memcg=/foo,task=bash,pid=7997,uid=0 after this patch: oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null), cpuset=/,mems_allowed=0,oom_memcg=/foo,task_memcg=/foo,task=bash,pid=13681,uid=0 Link: http://lkml.kernel.org/r/1560522038-15879-1-git-send-email-laoar.shao@gmail.com Fixes: ef8444ea01d7 ("mm, oom: reorganize the oom report in dump_header") Signed-off-by: Yafang Shao Acked-by: Michal Hocko Cc: Wind Yu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/oom_kill.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 5a58778c91d4..f719b64741d6 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -987,8 +987,7 @@ static void oom_kill_process(struct oom_control *oc, const char *message) /* * Determines whether the kernel must panic because of the panic_on_oom sysctl. */ -static void check_panic_on_oom(struct oom_control *oc, - enum oom_constraint constraint) +static void check_panic_on_oom(struct oom_control *oc) { if (likely(!sysctl_panic_on_oom)) return; @@ -998,7 +997,7 @@ static void check_panic_on_oom(struct oom_control *oc, * does not panic for cpuset, mempolicy, or memcg allocation * failures. */ - if (constraint != CONSTRAINT_NONE) + if (oc->constraint != CONSTRAINT_NONE) return; } /* Do not panic for oom kills triggered by sysrq */ @@ -1035,7 +1034,6 @@ EXPORT_SYMBOL_GPL(unregister_oom_notifier); bool out_of_memory(struct oom_control *oc) { unsigned long freed = 0; - enum oom_constraint constraint = CONSTRAINT_NONE; if (oom_killer_disabled) return false; @@ -1071,10 +1069,10 @@ bool out_of_memory(struct oom_control *oc) * Check if there were limitations on the allocation (only relevant for * NUMA and memcg) that may require different handling. */ - constraint = constrained_alloc(oc); - if (constraint != CONSTRAINT_MEMORY_POLICY) + oc->constraint = constrained_alloc(oc); + if (oc->constraint != CONSTRAINT_MEMORY_POLICY) oc->nodemask = NULL; - check_panic_on_oom(oc, constraint); + check_panic_on_oom(oc); if (!is_memcg_oom(oc) && sysctl_oom_kill_allocating_task && current->mm && !oom_unkillable_task(current, NULL, oc->nodemask) && -- 2.30.2