The patch titled
Subject: mm, oom: dump stack of victim when reaping failed
has been added to the -mm tree. Its filename is
mm-oom-dump-stack-of-victim-when-reaping-failed.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-oom-dump-stack-of-victim-when-reaping-failed.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-oom-dump-stack-of-victim-when-reaping-failed.patch
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The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: David Rientjes <rientjes@xxxxxxxxxx>
Subject: mm, oom: dump stack of victim when reaping failed
When a process cannot be oom reaped, for whatever reason, currently the
list of locks that are held is currently dumped to the kernel log.
Much more interesting is the stack trace of the victim that cannot be
reaped. If the stack trace is dumped, we have the ability to find related
occurrences in the same kernel code and hopefully solve the issue that is
making it wedged.
Dump the stack trace when a process fails to be oom reaped.
Link: http://lkml.kernel.org/r/alpine.DEB.2.21.2001141519280.200484@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/oom_kill.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/oom_kill.c~mm-oom-dump-stack-of-victim-when-reaping-failed
+++ a/mm/oom_kill.c
@@ -26,6 +26,7 @@
#include <linux/sched/mm.h>
#include <linux/sched/coredump.h>
#include <linux/sched/task.h>
+#include <linux/sched/debug.h>
#include <linux/swap.h>
#include <linux/timex.h>
#include <linux/jiffies.h>
@@ -619,6 +620,7 @@ static void oom_reap_task(struct task_st
pr_info("oom_reaper: unable to reap pid:%d (%s)\n",
task_pid_nr(tsk), tsk->comm);
+ sched_show_task(tsk);
debug_show_all_locks();
done:
_
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
mm-oom-dump-stack-of-victim-when-reaping-failed.patch
