From: Nils Holland <nholland@tisys.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
Michal Hocko <mhocko@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Chris Mason <clm@fb.com>, David Sterba <dsterba@suse.cz>,
linux-btrfs@vger.kernel.org
Subject: Re: OOM: Better, but still there on
Date: Sat, 17 Dec 2016 22:06:47 +0100 [thread overview]
Message-ID: <20161217210646.GA11358@boerne.fritz.box> (raw)
In-Reply-To: <862a1ada-17f1-9cff-c89b-46c47432e89f@I-love.SAKURA.ne.jp>
On Sat, Dec 17, 2016 at 11:44:45PM +0900, Tetsuo Handa wrote:
> On 2016/12/17 21:59, Nils Holland wrote:
> > On Sat, Dec 17, 2016 at 01:02:03AM +0100, Michal Hocko wrote:
> >> mount -t tracefs none /debug/trace
> >> echo 1 > /debug/trace/events/vmscan/enable
> >> cat /debug/trace/trace_pipe > trace.log
> >>
> >> should help
> >> [...]
> >
> > No problem! I enabled writing the trace data to a file and then tried
> > to trigger another OOM situation. That worked, this time without a
> > complete kernel panic, but with only my processes being killed and the
> > system becoming unresponsive.
>
> Under OOM situation, writing to a file on disk unlikely works. Maybe
> logging via network ( "cat /debug/trace/trace_pipe > /dev/udp/$ip/$port"
> if your are using bash) works better. (I wish we can do it from kernel
> so that /bin/cat is not disturbed by delays due to page fault.)
>
> If you can configure netconsole for logging OOM killer messages and
> UDP socket for logging trace_pipe messages, udplogger at
> https://osdn.net/projects/akari/scm/svn/tree/head/branches/udplogger/
> might fit for logging both output with timestamp into a single file.
Actually, I decided to give this a try once more on machine #2, i.e.
not the one that produced the previous trace, but the other one.
I logged via netconsole as well as 'cat /debug/trace/trace_pipe' via
the network to another machine running udplogger. After the machine
had been frehsly booted and I had set up the logging, unpacking of the
firefox source tarball started. After it had been unpacking for a
while, the first load of trace messages started to appear. Some time
later, OOMs started to appear - I've got quite a lot of them in my
capture file this time.
Unfortunately, the reclaim trace messages stopped a while after the first
OOM messages show up - most likely my "cat" had been killed at that
point or became unresponsive. :-/
In the end, the machine didn't completely panic, but after nothing new
showed up being logged via the network, I walked up to the
machine and found it in a state where I couldn't really log in to it
anymore, but all that worked was, as always, a magic SysRequest reboot.
The complete log, from machine boot right up to the point where it
wouldn't really do anything anymore, is up again on my web server (~42
MB, 928 KB packed):
http://ftp.tisys.org/pub/misc/teela_2016-12-17.log.xz
Greetings
Nils
next prev parent reply other threads:[~2016-12-17 21:06 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-15 22:57 OOM: Better, but still there on 4.9 Nils Holland
2016-12-16 7:39 ` Michal Hocko
2016-12-16 15:58 ` OOM: Better, but still there on Michal Hocko
2016-12-16 15:58 ` [PATCH 1/2] mm: consolidate GFP_NOFAIL checks in the allocator slowpath Michal Hocko
2016-12-16 15:58 ` [PATCH 2/2] mm, oom: do not enfore OOM killer for __GFP_NOFAIL automatically Michal Hocko
2016-12-16 17:31 ` Johannes Weiner
2016-12-16 22:12 ` Michal Hocko
2016-12-17 11:17 ` Tetsuo Handa
2016-12-18 16:37 ` Michal Hocko
2016-12-16 18:47 ` OOM: Better, but still there on Nils Holland
2016-12-17 0:02 ` Michal Hocko
2016-12-17 12:59 ` Nils Holland
2016-12-17 14:44 ` Tetsuo Handa
2016-12-17 17:11 ` Nils Holland
2016-12-17 21:06 ` Nils Holland [this message]
2016-12-18 5:14 ` Tetsuo Handa
2016-12-19 13:45 ` Michal Hocko
2016-12-20 2:08 ` Nils Holland
2016-12-21 7:36 ` Michal Hocko
2016-12-21 11:00 ` Tetsuo Handa
2016-12-21 11:16 ` Michal Hocko
2016-12-21 14:04 ` Chris Mason
2016-12-22 10:10 ` Nils Holland
2016-12-22 10:27 ` Michal Hocko
2016-12-22 10:35 ` Nils Holland
2016-12-22 10:46 ` Tetsuo Handa
2016-12-22 19:17 ` Michal Hocko
2016-12-22 21:46 ` Nils Holland
2016-12-23 10:51 ` Michal Hocko
2016-12-23 12:18 ` Nils Holland
2016-12-23 12:57 ` Michal Hocko
2016-12-23 14:47 ` [RFC PATCH] mm, memcg: fix (Re: OOM: Better, but still there on) Michal Hocko
2016-12-23 22:26 ` Nils Holland
2016-12-26 12:48 ` Michal Hocko
2016-12-26 18:57 ` Nils Holland
2016-12-27 8:08 ` Michal Hocko
2016-12-27 11:23 ` Nils Holland
2016-12-27 11:27 ` Michal Hocko
2016-12-27 15:55 ` Michal Hocko
2016-12-27 16:28 ` [PATCH] mm, vmscan: consider eligible zones in get_scan_count kbuild test robot
2016-12-28 8:51 ` Michal Hocko
2016-12-27 19:33 ` [RFC PATCH] mm, memcg: fix (Re: OOM: Better, but still there on) Nils Holland
2016-12-28 8:57 ` Michal Hocko
2016-12-29 1:20 ` Minchan Kim
2016-12-29 9:04 ` Michal Hocko
2016-12-30 2:05 ` Minchan Kim
2016-12-30 10:40 ` Michal Hocko
2016-12-29 0:31 ` Minchan Kim
2016-12-29 0:48 ` Minchan Kim
2016-12-29 8:52 ` Michal Hocko
2016-12-30 10:19 ` Mel Gorman
2016-12-30 11:05 ` Michal Hocko
2016-12-30 12:43 ` Mel Gorman
2016-12-25 22:25 ` [lkp-developer] [mm, memcg] d18e2b2aca: WARNING:at_mm/memcontrol.c:#mem_cgroup_update_lru_size kernel test robot
2016-12-26 12:26 ` Michal Hocko
2016-12-26 12:50 ` Michal Hocko
2016-12-18 0:28 ` OOM: Better, but still there on Xin Zhou
2016-12-16 18:15 ` OOM: Better, but still there on 4.9 Chris Mason
2016-12-16 22:14 ` Michal Hocko
2016-12-16 22:47 ` Chris Mason
2016-12-16 23:31 ` Michal Hocko
2016-12-16 19:50 ` Chris Mason
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