linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Michal Hocko <mhocko@kernel.org>
To: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch] mm, oom: dump stack of victim when reaping failed
Date: Wed, 15 Jan 2020 09:43:36 +0100	[thread overview]
Message-ID: <20200115084336.GW19428@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.21.2001141519280.200484@chino.kir.corp.google.com>

On Tue 14-01-20 15:20:04, David Rientjes wrote:
> 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.

Yes, this is really helpful.

> Signed-off-by: David Rientjes <rientjes@google.com>

Acked-by: Michal Hocko <mhocko@suse.com>

Thanks!

> ---
>  mm/oom_kill.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> --- a/mm/oom_kill.c
> +++ b/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>
> @@ -620,6 +621,7 @@ static void oom_reap_task(struct task_struct *tsk)
>  
>  	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:

-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2020-01-15  8:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-14 23:20 [patch] mm, oom: dump stack of victim when reaping failed David Rientjes
2020-01-15  8:43 ` Michal Hocko [this message]
2020-01-15  9:18   ` Tetsuo Handa
2020-01-15 20:27     ` David Rientjes
2020-01-15 21:09       ` Tetsuo Handa
2020-01-16 21:05         ` David Rientjes

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200115084336.GW19428@dhcp22.suse.cz \
    --to=mhocko@kernel.org \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=rientjes@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).