Re: "No space left on device" errors

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On 10/16/19 9:07 PM, Jason Dillaman wrote:
> On Wed, Oct 16, 2019 at 8:37 PM Kyrylo Shatskyy
> <kyrylo.shatskyy@xxxxxxxx> wrote:
>>
>> Here is the log which supposed to have this issue:
> 
> Negative -- stepping back here. I brought this issue up for these runs:
> 
> http://pulpito.ceph.com/yuriw-2019-10-11_12:58:22-rbd-wip-yuri6-testing-2019-10-10-2057-mimic-distro-basic-smithi/
> http://pulpito.ceph.com/yuriw-2019-10-11_19:41:35-rbd-wip-yuri8-testing-2019-10-11-1347-luminous-distro-basic-smithi/
> 
> In these runs, you can see the OSDs crashing because it runs out of
> space on the OSD block devices. The log you are looking at is a test
> where the OSDs at debug log level 20 most likely actually filled up
> "/var/log" -- but they didn't fill up their block device
> 
> Under the runs above, when the OSD crashes, we can start to see logs like:
> 
> 2019-10-13T09:31:17.097
> INFO:tasks.ceph.mon.a.smithi167.stderr:2019-10-13 09:31:17.095566
> 7f18a21be700 -1 log_channel(cluster) log [ERR] : Health check failed:
> 4 full osd(s) (OSD_FULL)
> 2019-10-13T09:31:22.117
> INFO:tasks.ceph.mon.a.smithi167.stderr:2019-10-13 09:31:22.115362
> 7f18a21be700 -1 log_channel(cluster) log [ERR] : Health check update:
> 1 full osd(s) (OSD_FULL)
> 2019-10-13T09:31:27.632
> INFO:tasks.ceph.mon.a.smithi167.stderr:2019-10-13 09:31:27.630483
> 7f189f9b9700 -1 log_channel(cluster) log [ERR] : Health check failed:
> mon b is very low on available space (MON_DISK_CRIT)
> 2019-10-13T09:31:28.672
> INFO:tasks.ceph.mon.a.smithi167.stderr:2019-10-13 09:31:28.670676
> 7f18a21be700 -1 log_channel(cluster) log [ERR] : Health check failed:
> 4 full osd(s) (OSD_FULL)
> 2019-10-13T09:31:32.980
> INFO:tasks.ceph.mon.a.smithi167.stderr:2019-10-13 09:31:32.978369
> 7f18a21be700 -1 log_channel(cluster) log [ERR] : Health check update:
> mons a,b,c are very low on available space (MON_DISK_CRIT)
> 2019-10-13T09:31:34.061
> INFO:tasks.ceph.mon.a.smithi167.stderr:2019-10-13 09:31:34.053935
> 7f18a21be700 -1 log_channel(cluster) log [ERR] : Health check update:
> 2 full osd(s) (OSD_FULL)
> 2019-10-13T09:31:40.153
> INFO:tasks.ceph.osd.0.smithi167.stderr:2019-10-13 09:31:40.151323
> 7fd400753700 -1 log_channel(cluster) log [ERR] : full status failsafe
> engaged, dropping updates, now 97% full
> 2019-10-13T09:31:40.328
> INFO:tasks.ceph.mon.a.smithi167.stderr:2019-10-13 09:31:40.326090
> 7f18a21be700 -1 log_channel(cluster) log [ERR] : Health check failed:
> 1 full osd(s) (OSD_FULL)
> 2019-10-13T09:31:40.494
> INFO:tasks.ceph.osd.3.smithi167.stderr:2019-10-13 09:31:40.492169
> 7fda29d9c700 -1 log_channel(cluster) log [ERR] : full status failsafe
> engaged, dropping updates, now 97% full
> 2019-10-13T09:31:40.900
> INFO:tasks.ceph.osd.1.smithi167.stderr:2019-10-13 09:31:40.898979
> 7f10785bb700 -1 log_channel(cluster) log [ERR] : full status failsafe
> engaged, dropping updates, now 98% full
> 2019-10-13T09:31:41.279
> INFO:tasks.ceph.osd.4.smithi174.stderr:2019-10-13 09:31:41.277991
> 7f8651337700 -1 log_channel(cluster) log [ERR] : full status failsafe
> engaged, dropping updates, now 98% full
> 2019-10-13T09:31:41.525
> INFO:tasks.ceph.osd.2.smithi167.stderr:2019-10-13 09:31:41.523075
> 7f1df905a700 -1 log_channel(cluster) log [ERR] : full status failsafe
> engaged, dropping updates, now 98% full
> 2019-10-13T09:31:42.493
> INFO:tasks.ceph.osd.7.smithi174.stderr:2019-10-13 09:31:42.491132
> 7febd19f8700 -1 log_channel(cluster) log [ERR] : full status failsafe
> engaged, dropping updates, now 98% full
> 2019-10-13T09:31:43.281
> INFO:tasks.ceph.osd.5.smithi174.stderr:2019-10-13 09:31:43.279310
> 7f9c80f21700 -1 log_channel(cluster) log [ERR] : full status failsafe
> engaged, dropping updates, now 98% full
> 2019-10-13T09:31:44.399
> INFO:tasks.ceph.osd.6.smithi174.stderr:2019-10-13 09:31:44.398004
> 7f4c2bf61700 -1 log_channel(cluster) log [ERR] : full status failsafe
> engaged, dropping updates, now 98% full
> 
> And why to the OSDs get full? Teuthology is running w/ 41a13ec included ...
> 
> 2019-10-13T07:26:11.215 INFO:root:teuthology version: 1.0.0-471e0e3
> 
> ... as verified by ...
> 
> $ git log --oneline 471e0e30 | grep 41a13ec || echo ABSENT
> 41a13eca misc: use remote.sh instead of remote.run
> 
> While teuthology is actually formatting the NVMe devices, it never
> actually mounts them since logs like the following are missing ...
> 
> 2019-10-09T20:53:48.276 INFO:teuthology.orchestra.run.smithi136:> sudo
> mount -t xfs -o noatime /dev/vg_nvme/lv_4 /var/lib/ceph/osd/ceph-0
> 
> ... and therefore the OSDs are filling up the 1TiB root partition:.

Almost perfectly described.  lv_5 gets mounted at /var/lib/ceph by
ceph-cm-ansible and the other 4 LVs on each NVMe are *supposed* to get
mounted at a /var/lib/ceph/osd/$id directory.  So the jobs were filling
up the 15GB lv_5 partition if enough data was written because the OSDs
were raw directories on lv_5 instead of mountpoints on the other LVs.

Thank you much for chiming in and helping clarify the issue(s).

> 
>> http://qa-proxy.ceph.com/teuthology/yuriw-2019-10-09_15:42:09-rbd-wip-yuri5-testing-2019-10-08-2016-luminous-distro-basic-smithi/4371741/teuthology.log
>>
>> $ curl -s http://qa-proxy.ceph.com/teuthology/yuriw-2019-10-09_15:42:09-rbd-wip-yuri5-testing-2019-10-08-2016-luminous-distro-basic-smithi/4371741/teuthology.log | grep -c "No space left"
>> 90
>>
>> The 41a13ec is merged after this job even executed:
>> 0456e3e 2019-10-10 19:01 +0200 kshtsk              M─┤ Merge pull request #1318 from kshtsk/wip-misc-use-remote-sh
>> 41a13ec 2019-10-09 00:04 +0200 Kyr Shatskyy        │ o {origin/wip-misc-use-remote-sh} misc: use remote.sh instead of remote.run
>>
>> It is another proof it is not the cause of the failure.
>> So my question, why do we still consider it is as the only reason? Do we have any other ideas?
>>
>> Kyrylo Shatskyy
>> --
>> SUSE Software Solutions Germany GmbH
>> Maxfeldstr. 5
>> 90409 Nuremberg
>> Germany
>>
>>
>> On Oct 17, 2019, at 2:06 AM, Jason Dillaman <jdillama@xxxxxxxxxx> wrote:
>>
>> On Wed, Oct 16, 2019 at 8:03 PM kyr <kshatskyy@xxxxxxx> wrote:
>>
>>
>> So Yuri,
>>
>> is it reproducible only for luminous? or you have seen this on master or any other branches?
>>
>>
>> It's on all branches -- as of at least last week.
>>
>>
>> Kyrylo Shatskyy
>> --
>> SUSE Software Solutions Germany GmbH
>> Maxfeldstr. 5
>> 90409 Nuremberg
>> Germany
>>
>>
>> On Oct 17, 2019, at 1:39 AM, Yuri Weinstein <yweinste@xxxxxxxxxx> wrote:
>>
>> Kyr
>>
>> Here is how I did it:
>>
>> RERUN=yuriw-2019-10-15_22:08:48-rbd-wip-yuri8-testing-2019-10-11-1347-luminous-distro-basic-smithi
>> CEPH_QA_MAIL="ceph-qa@xxxxxxx"; MACHINE_NAME=smithi;
>> CEPH_BRANCH=wip-yuri8-testing-2019-10-11-1347-luminous
>> teuthology-suite -v -c $CEPH_BRANCH -m $MACHINE_NAME -r $RERUN
>> --suite-repo https://github.com/ceph/ceph-ci.git --ceph-repo
>> https://github.com/ceph/ceph-ci.git --suite-branch $CEPH_BRANCH -p 70
>> -R fail,dead,running,waiting
>>
>> to test the fix add "-t wip-wwn-fix"
>>
>> On Wed, Oct 16, 2019 at 4:36 PM kyr <kshatskyy@xxxxxxx> wrote:
>>
>>
>> So I ran a job on smithi against teuthology code which is supposed to have "No space left on device":
>>
>> http://qa-proxy.ceph.com/teuthology/kyr-2019-10-16_22:55:36-smoke:basic-master-distro-basic-smithi/4416887/teuthology.log
>>
>> And it passed, has not this issue. Which exact suite does reproduce the issue?
>>
>> Kyrylo Shatskyy
>> --
>> SUSE Software Solutions Germany GmbH
>> Maxfeldstr. 5
>> 90409 Nuremberg
>> Germany
>>
>>
>> On Oct 17, 2019, at 12:35 AM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
>>
>> On Wed, Oct 16, 2019 at 2:39 PM kyr <kshatskyy@xxxxxxx> wrote:
>>
>>
>> I hope the nathans fix can probably do the thing, however it does not cover the the log referenced in the description of https://tracker.ceph.com/issues/42313 because teuthology worker does not include that fix which is supposed to be cause for "No space left on device" issue.
>>
>>
>> I'm not quite sure what you mean here. I think one of these addresses
>> your statement?
>> 1) we were creating very small OSDs on the root device since the
>> partitions weren't being mounted, and so these jobs actually filled
>> them up as a consequence of that.
>> 2) most of the teuthology repo is pulled fresh from master on every
>> run. The workers themselves require restarting to get updates but
>> that's pretty rare. (See
>> https://github.com/ceph/teuthology/blob/master/teuthology/worker.py#L82)
>>
>>
>>
>> Can some one give one-job teuthology-suite command  that 100% reproducing the issue?
>>
>> Kyrylo Shatskyy
>> --
>> SUSE Software Solutions Germany GmbH
>> Maxfeldstr. 5
>> 90409 Nuremberg
>> Germany
>>
>>
>> On Oct 16, 2019, at 11:14 PM, Nathan Cutler <ncutler@xxxxxxxx> wrote:
>>
>> On Wed, Oct 16, 2019 at 12:43:32PM -0700, Gregory Farnum wrote:
>>
>> On Wed, Oct 16, 2019 at 12:24 PM David Galloway <dgallowa@xxxxxxxxxx> wrote:
>>
>>
>> Yuri just reminded me that he's seeing this problem on the mimic branch.
>>
>> Does that mean this PR just needs to be backported to all branches?
>>
>> https://github.com/ceph/ceph/pull/30792
>>
>>
>> I'd be surprised if that one (changing iteritems() to items()) could
>> cause this, and it's not a fix for any known bugs, just ongoing py3
>> work.
>>
>> When I said "that commit" I was referring to
>> https://github.com/ceph/teuthology/commit/41a13eca480e38cfeeba7a180b4516b90598c39b,
>> which is in the teuthology repo and thus hits every test run. Looking
>> at the comments across https://github.com/ceph/teuthology/pull/1332
>> and https://tracker.ceph.com/issues/42313 it sounds like that
>> teuthology commit accidentally fixed a bug which triggered another bug
>> that we're not sure how to resolve, but perhaps I'm misunderstanding?
>>
>>
>> I think I understand what's going on. Here's an interim fix:
>> https://github.com/ceph/teuthology/pull/1334
>>
>> Assuming this PR really does fix the issue, the "real" fix will be to drop
>> get_wwn_id_map altogether, since it has long outlived its usefulness ( see
>> https://tracker.ceph.com/issues/14855 ).
>>
>> Nathan
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>>
>>
>>
>> --
>> Jason
>>
>>
> 
> 
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