On Sun, Dec 30, 2012 at 10:56 PM, Samuel Just <sam.just@xxxxxxxxxxx> wrote: > Sorry for the delay. A quick look at the log doesn't show anything > obvious... Can you elaborate on how you caused the hang? > -Sam > I am sorry for all this noise, the issue almost for sure has been triggered by some bug in the Infiniband switch firmware because per-port reset was able to solve ``wrong mark'' problem - at least, it haven`t showed up yet for a week. The problem took almost two days until resolution - all possible connectivity tests displayed no overtimes or drops which can cause wrong marks. Finally, I have started playing with TCP settings and found that ipv4.tcp_low_latency raising possibility of ``wrong mark'' event several times when enabled - so area of all possible causes quickly collapsed to the media-only problem and I fixed problem soon. > On Wed, Dec 19, 2012 at 3:53 AM, Andrey Korolyov <andrey@xxxxxxx> wrote: >> Please take a look at the log below, this is slightly different bug - >> both osd processes on the node was stuck eating all available cpu >> until I killed them. This can be reproduced by doing parallel export >> of different from same client IP using both ``rbd export'' or API >> calls - after a couple of wrong ``downs'' osd.19 and osd.27 finally >> stuck. What is more interesting, 10.5.0.33 holds most hungry set of >> virtual machines, eating constantly four of twenty-four HT cores, and >> this node fails almost always, Underlying fs is an XFS, ceph version >> gf9d090e. With high possibility my previous reports are about side >> effects of this problem. >> >> http://xdel.ru/downloads/ceph-log/osd-19_and_27_stuck.log.gz >> >> and timings for the monmap, logs are from different hosts, so they may >> have a time shift of tens of milliseconds: >> >> http://xdel.ru/downloads/ceph-log/timings-crash-osd_19_and_27.txt >> >> Thanks! >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
