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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@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2020-01-30 22:14:26 -08:00 committed by Linus Torvalds
parent a090d711dd
commit 8a7ff02aca
1 changed files with 2 additions and 0 deletions
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2
mm/oom_kill.c
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@ -26,6 +26,7 @@
#include <linux/sched/mm.h> #include <linux/sched/mm.h>
#include <linux/sched/coredump.h> #include <linux/sched/coredump.h>
#include <linux/sched/task.h> #include <linux/sched/task.h>
#include <linux/sched/debug.h>
#include <linux/swap.h> #include <linux/swap.h>
#include <linux/timex.h> #include <linux/timex.h>
#include <linux/jiffies.h> #include <linux/jiffies.h>
@ -620,6 +621,7 @@ static void oom_reap_task(struct task_struct *tsk)
pr_info("oom_reaper: unable to reap pid:%d (%s)\n", pr_info("oom_reaper: unable to reap pid:%d (%s)\n",
task_pid_nr(tsk), tsk->comm); task_pid_nr(tsk), tsk->comm);
sched_show_task(tsk);
debug_show_all_locks(); debug_show_all_locks();
done: done: