Re: OOM: Better, but still there on

On Sat, Dec 17, 2016 at 11:44:45PM +0900, Tetsuo Handa wrote:

On 2016/12/17 21:59, Nils Holland wrote:

quoted

On Sat, Dec 17, 2016 at 01:02:03AM +0100, Michal Hocko wrote:

quoted

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

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