From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
dump_task() should use find_lock_task_mm() too. It is necessary for
protecting task-exiting race.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
mm/oom_kill.c | 39 +++++++++++++++++++++------------------
1 files changed, 21 insertions(+), 18 deletions(-)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -336,35 +336,38 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
*/
static void dump_tasks(const struct mem_cgroup *mem)
{
- struct task_struct *g, *p;
+ struct task_struct *p;
+ struct task_struct *task;
printk(KERN_INFO "[ pid ] uid tgid total_vm rss cpu oom_adj "
"name\n");
- do_each_thread(g, p) {
- struct mm_struct *mm;
-
- if (mem && !task_in_mem_cgroup(p, mem))
+ for_each_process(p) {
+ /*
+ * We don't have is_global_init() check here, because the old
+ * code do that. printing init process is not big matter. But
+ * we don't hope to make unnecessary compatibility breaking.
+ */
+ if (p->flags & PF_KTHREAD)
continue;
- if (!thread_group_leader(p))
+ if (mem && !task_in_mem_cgroup(p, mem))
continue;
- task_lock(p);
- mm = p->mm;
- if (!mm) {
+ task = find_lock_task_mm(p);
+ if (!task) {
/*
- * total_vm and rss sizes do not exist for tasks with no
- * mm so there's no need to report them; they can't be
- * oom killed anyway.
+ * Probably oom vs task-exiting race was happen and ->mm
+ * have been detached. thus there's no need to report
+ * them; they can't be oom killed anyway.
*/
- task_unlock(p);
continue;
}
+
printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d %3d %s\n",
- p->pid, __task_cred(p)->uid, p->tgid, mm->total_vm,
- get_mm_rss(mm), (int)task_cpu(p), p->signal->oom_adj,
- p->comm);
- task_unlock(p);
- } while_each_thread(g, p);
+ task->pid, __task_cred(task)->uid, task->tgid,
+ task->mm->total_vm, get_mm_rss(task->mm),
+ (int)task_cpu(task), task->signal->oom_adj, p->comm);
+ task_unlock(task);
+ }
}
static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
--
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