Re: OSD reboot loop after running out of memory

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Hi Stefan,
Initial data removal could also have resulted from a snapshot removal leading to OSDs OOMing and then pg remappings leading to more removals after OOMed OSDs rejoined the cluster and so on.
As mentioned by Igor : "Additionally there are users' reports that recent default value's modification for bluefs_buffered_io setting has negative impact (or just worsen existing issue with massive removal) as well. So you might want to switch it back to true."
We're some of them. Our cluster suffered from a severe performance drop during snapshot removal right after upgrading to Nautilus, due to bluefs_buffered_io being set to false by default, with slow requests observed around the cluster. Once back to true (can be done with ceph tell osd.* injectargs '--bluefs_buffered_io=true') snap trimming would be fast again so as before the upgrade, with no more slow requests.
But of course we've seen the excessive memory swap usage described here : https://github.com/ceph/ceph/pull/34224 So we lower osd_memory_target from 8MB to 4MB and haven't observed any swap usage since then. You can also have a look here : https://github.com/ceph/ceph/pull/38044
What you need to look at to understand if your cluster would benefit from changing bluefs_buffered_io back to true is the %util of your RocksDBD devices on an iostat. Run an iostat -dmx 1 /dev/sdX (if you're using SSD RocksDB devices) and look at the %util of the device with bluefs_buffered_io=false and with bluefs_buffered_io=true. If with bluefs_buffered_io=false, the %util is over 75% most of the time, then you'd better change it to true. :-) 

Regards,

Frédéric.

Le 14/12/2020 à 12:47, Stefan Wild a écrit :

Hi Igor,

Thank you for the detailed analysis. That makes me hopeful we can get the cluster back on track. No pools have been removed, but yes, due to the initial crash of multiple OSDs and the subsequent issues with individual OSDs we’ve had substantial PG remappings happening constantly.

I will look up the referenced thread(s) and try the offline DB compaction. It would be amazing if that does the trick.

Will keep you posted, here.

Thanks,
Stefan

________________________________
From: Igor Fedotov <ifedotov@xxxxxxx>
Sent: Monday, December 14, 2020 6:39:28 AM
To: Stefan Wild <swild@xxxxxxxxxxxxx>; ceph-users@xxxxxxx <ceph-users@xxxxxxx>
Subject: Re:  Re: OSD reboot loop after running out of memory

Hi Stefan,

given the crash backtrace in your log I presume some data removal is in
progress:

Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  3:
(KernelDevice::direct_read_unaligned(unsigned long, unsigned long,
char*)+0xd8) [0x5587b9364a48]
Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  4:
(KernelDevice::read_random(unsigned long, unsigned long, char*,
bool)+0x1b3) [0x5587b93653e3]
Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  5:
(BlueFS::_read_random(BlueFS::FileReader*, unsigned long, unsigned long,
char*)+0x674) [0x5587b9328cb4]
...

Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  19:
(BlueStore::_do_omap_clear(BlueStore::TransContext*,
boost::intrusive_ptr<BlueStore::Onode>&)+0xa2) [0x5587b922f0e2]
Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  20:
(BlueStore::_do_remove(BlueStore::TransContext*,
boost::intrusive_ptr<BlueStore::Collection>&,
boost::intrusive_ptr<BlueStore::Onode>)+0xc65) [0x5587b923b555]
Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  21:
(BlueStore::_remove(BlueStore::TransContext*,
boost::intrusive_ptr<BlueStore::Collection>&,
boost::intrusive_ptr<BlueStore::Onode>&)+0x64) [0x5587b923c3b4]
...

Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  24:
(ObjectStore::queue_transaction(boost::intrusive_ptr<ObjectStore::CollectionImpl>&,
ceph::os::Transaction&&, boost::intrusive_ptr<TrackedOp>,
ThreadPool::TPHandle*)+0x85) [0x5587b8dcf745]
Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  25:
(PG::do_delete_work(ceph::os::Transaction&)+0xb2e) [0x5587b8e269ee]
Dec 12 21:58:38 ceph-tpa-server1 bash[784256]:  26:
(PeeringState::Deleting::react(PeeringState::DeleteSome const&)+0x3e)
[0x5587b8fd6ede]
...

Did you initiate some large pool removal recently? Or may be data
rebalancing triggered PG migration (and hence source PG removal) for you?

Highly likely you're facing a well known issue with RocksDB/BlueFS
performance issues caused by massive data removal.

So your OSDs are just processing I/O very slowly which triggers suicide
timeout.

We've had multiple threads on the issue in this mailing list - the
latest one is at
https://lists.ceph.io/hyperkitty/list/ceph-users@xxxxxxx/thread/YBHNOSWW72ZVQ6PD5NABEEYRDMX7OZTT/

For now the good enough workaround is manual offline DB compaction for
all the OSDs (this might have temporary effect though as the removal
proceeds).

Additionally there are users' reports that recent default value's
modification  for bluefs_buffered_io setting has negative impact (or
just worsen existing issue with massive removal) as well. So you might
want to switch it back to true.

As for OSD.10 - can't say for sure as I haven't seen its' logs but I
think it's experiencing the same issue which might eventually lead it
into unresponsive state as well. Just grep its log for "heartbeat_map
is_healthy 'OSD::osd_op_tp thread" strings.


Thanks,

Igor

On 12/13/2020 3:46 PM, Stefan Wild wrote:

Hi Igor,

Full osd logs from startup to failed exit:
https://tiltworks.com/osd.1.log

In other news, can I expect osd.10 to go down next?

Dec 13 07:40:14 ceph-tpa-server1 bash[1825010]: debug 2020-12-13T12:40:14.823+0000 7ff37c2e1700 -1 osd.7 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:43.310905+0000 front 2020-12-13T12:39:43.311164+0000 (oldest deadline 2020-12-13T12:40:06.810981+0000)
Dec 13 07:40:15 ceph-tpa-server1 bash[1824817]: debug 2020-12-13T12:40:15.055+0000 7f9220af3700 -1 osd.11 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:42.972558+0000 front 2020-12-13T12:39:42.972702+0000 (oldest deadline 2020-12-13T12:40:05.272435+0000)
Dec 13 07:40:15 ceph-tpa-server1 bash[2060428]: debug 2020-12-13T12:40:15.155+0000 7fb247eaf700 -1 osd.8 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:42.181904+0000 front 2020-12-13T12:39:42.181856+0000 (oldest deadline 2020-12-13T12:40:06.281648+0000)
Dec 13 07:40:15 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:15.171+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.2 is reporting failure:0
Dec 13 07:40:15 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:15.171+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.2
Dec 13 07:40:15 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:15.176057+0000 mon.ceph-tpa-server1 (mon.0) 1172513 : cluster [DBG] osd.10 failure report canceled by osd.2
Dec 13 07:40:15 ceph-tpa-server1 bash[1824779]: debug 2020-12-13T12:40:15.295+0000 7fa60679a700 -1 osd.0 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:43.326792+0000 front 2020-12-13T12:39:43.326666+0000 (oldest deadline 2020-12-13T12:40:07.426786+0000)
Dec 13 07:40:15 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:15.423+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.6 is reporting failure:0
Dec 13 07:40:15 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:15.423+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.6
Dec 13 07:40:15 ceph-tpa-server1 bash[1824845]: debug 2020-12-13T12:40:15.447+0000 7f85048db700 -1 osd.3 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:39.770822+0000 front 2020-12-13T12:39:39.770700+0000 (oldest deadline 2020-12-13T12:40:05.070662+0000)
Dec 13 07:40:15 ceph-tpa-server1 bash[231499]: debug 2020-12-13T12:40:15.687+0000 7fa8e1800700 -1 osd.4 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:39.977106+0000 front 2020-12-13T12:39:39.977176+0000 (oldest deadline 2020-12-13T12:40:04.677320+0000)
Dec 13 07:40:15 ceph-tpa-server1 bash[1825010]: debug 2020-12-13T12:40:15.799+0000 7ff37c2e1700 -1 osd.7 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:43.310905+0000 front 2020-12-13T12:39:43.311164+0000 (oldest deadline 2020-12-13T12:40:06.810981+0000)
Dec 13 07:40:16 ceph-tpa-server1 bash[1824817]: debug 2020-12-13T12:40:16.019+0000 7f9220af3700 -1 osd.11 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:42.972558+0000 front 2020-12-13T12:39:42.972702+0000 (oldest deadline 2020-12-13T12:40:05.272435+0000)
Dec 13 07:40:16 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:16.179+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.4 is reporting failure:0
Dec 13 07:40:16 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:16.179+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.4
Dec 13 07:40:16 ceph-tpa-server1 bash[2060428]: debug 2020-12-13T12:40:16.191+0000 7fb247eaf700 -1 osd.8 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:42.181904+0000 front 2020-12-13T12:39:42.181856+0000 (oldest deadline 2020-12-13T12:40:06.281648+0000)
Dec 13 07:40:16 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:15.429755+0000 mon.ceph-tpa-server1 (mon.0) 1172514 : cluster [DBG] osd.10 failure report canceled by osd.6
Dec 13 07:40:16 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:16.183521+0000 mon.ceph-tpa-server1 (mon.0) 1172515 : cluster [DBG] osd.10 failure report canceled by osd.4
Dec 13 07:40:16 ceph-tpa-server1 bash[1824779]: debug 2020-12-13T12:40:16.303+0000 7fa60679a700 -1 osd.0 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:43.326792+0000 front 2020-12-13T12:39:43.326666+0000 (oldest deadline 2020-12-13T12:40:07.426786+0000)
Dec 13 07:40:16 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:16.371+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.3 is reporting failure:0
Dec 13 07:40:16 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:16.371+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.3
Dec 13 07:40:16 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:16.611+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.7 is reporting failure:0
Dec 13 07:40:16 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:16.611+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.7
Dec 13 07:40:16 ceph-tpa-server1 bash[1824817]: debug 2020-12-13T12:40:16.979+0000 7f9220af3700 -1 osd.11 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:42.972558+0000 front 2020-12-13T12:39:42.972702+0000 (oldest deadline 2020-12-13T12:40:05.272435+0000)
Dec 13 07:40:17 ceph-tpa-server1 bash[1824779]: debug 2020-12-13T12:40:17.271+0000 7fa60679a700 -1 osd.0 13375 heartbeat_check: no reply from 172.18.189.20:6878 osd.10 since back 2020-12-13T12:39:43.326792+0000 front 2020-12-13T12:39:43.326666+0000 (oldest deadline 2020-12-13T12:40:07.426786+0000)
Dec 13 07:40:17 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:16.378213+0000 mon.ceph-tpa-server1 (mon.0) 1172516 : cluster [DBG] osd.10 failure report canceled by osd.3
Dec 13 07:40:17 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:16.616685+0000 mon.ceph-tpa-server1 (mon.0) 1172517 : cluster [DBG] osd.10 failure report canceled by osd.7
Dec 13 07:40:17 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:17.727+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.0 is reporting failure:0
Dec 13 07:40:17 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:17.727+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.0
Dec 13 07:40:17 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:17.839+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.5 is reporting failure:0
Dec 13 07:40:17 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:17.839+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.5
Dec 13 07:40:18 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:17.733200+0000 mon.ceph-tpa-server1 (mon.0) 1172518 : cluster [DBG] osd.10 failure report canceled by osd.0
Dec 13 07:40:18 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:17.843775+0000 mon.ceph-tpa-server1 (mon.0) 1172519 : cluster [DBG] osd.10 failure report canceled by osd.5
Dec 13 07:40:18 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:18.575+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.11 is reporting failure:0
Dec 13 07:40:18 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:18.575+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.11
Dec 13 07:40:18 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:18.783+0000 7fe929be8700  1 mon.ceph-tpa-server1@0(leader).osd e13375 prepare_failure osd.10 [v2:172.18.189.20:6872/2139598710,v1:172.18.189.20:6873/2139598710] from osd.8 is reporting failure:0
Dec 13 07:40:18 ceph-tpa-server1 bash[1822497]: debug 2020-12-13T12:40:18.783+0000 7fe929be8700  0 log_channel(cluster) log [DBG] : osd.10 failure report canceled by osd.8
Dec 13 07:40:19 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:18.578914+0000 mon.ceph-tpa-server1 (mon.0) 1172520 : cluster [DBG] osd.10 failure report canceled by osd.11
Dec 13 07:40:19 ceph-tpa-server1 bash[1822497]: cluster 2020-12-13T12:40:18.789301+0000 mon.ceph-tpa-server1 (mon.0) 1172521 : cluster [DBG] osd.10 failure report canceled by osd.8


Thanks,
Stefan


On 12/13/20, 2:18 AM, "Igor Fedotov" <ifedotov@xxxxxxx> wrote:

      Hi Stefan,

      could you please share OSD startup log from /var/log/ceph?


      Thanks,

      Igor

      On 12/13/2020 5:44 AM, Stefan Wild wrote:
      > Just had another look at the logs and this is what I did notice after the affected OSD starts up.
      >
      > Loads of entries of this sort:
      >
      > Dec 12 21:38:40 ceph-tpa-server1 bash[780507]: debug 2020-12-13T02:38:40.851+0000 7fafd32c7700  1 heartbeat_map is_healthy 'OSD::osd_op_tp thread 0x7fafb721f700' had timed out after 15
      >
      > Then a few pages of this:
      >
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9249> 2020-12-13T02:35:44.018+0000 7fafb621d700  5 osd.1 pg_epoch: 13024 pg[28.11( empty local-lis/les=13015/13016 n=0 ec=1530
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9248> 2020-12-13T02:35:44.018+0000 7fafb621d700  5 osd.1 pg_epoch: 13024 pg[28.11( empty local-lis/les=13015/13016 n=0 ec=1530
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9247> 2020-12-13T02:35:44.018+0000 7fafb621d700  5 osd.1 pg_epoch: 13024 pg[28.11( empty local-lis/les=13015/13016 n=0 ec=1530
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9246> 2020-12-13T02:35:44.018+0000 7fafb621d700  1 osd.1 pg_epoch: 13024 pg[28.11( empty local-lis/les=13015/13016 n=0 ec=1530
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9245> 2020-12-13T02:35:44.018+0000 7fafb621d700  1 osd.1 pg_epoch: 13026 pg[28.11( empty local-lis/les=13015/13016 n=0 ec=1530
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9244> 2020-12-13T02:35:44.022+0000 7fafb721f700  5 osd.1 pg_epoch: 13143 pg[19.69s2( v 3437'1753192 (3437'1753192,3437'1753192
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9243> 2020-12-13T02:35:44.022+0000 7fafb721f700  5 osd.1 pg_epoch: 13143 pg[19.69s2( v 3437'1753192 (3437'1753192,3437'1753192
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9242> 2020-12-13T02:35:44.022+0000 7fafb721f700  5 osd.1 pg_epoch: 13143 pg[19.69s2( v 3437'1753192 (3437'1753192,3437'1753192
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9241> 2020-12-13T02:35:44.022+0000 7fafb721f700  1 osd.1 pg_epoch: 13143 pg[19.69s2( v 3437'1753192 (3437'1753192,3437'1753192
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9240> 2020-12-13T02:35:44.022+0000 7fafb721f700  5 osd.1 pg_epoch: 13143 pg[19.69s2( v 3437'1753192 (3437'1753192,3437'1753192
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9239> 2020-12-13T02:35:44.022+0000 7fafb721f700  5 osd.1 pg_epoch: 13143 pg[19.69s2( v 3437'1753192 (3437'1753192,3437'1753192
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9238> 2020-12-13T02:35:44.022+0000 7fafb521b700  5 osd.1 pg_epoch: 13143 pg[19.3bs10( v 3437'1759161 (3437'1759161,3437'175916
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9237> 2020-12-13T02:35:44.022+0000 7fafb521b700  5 osd.1 pg_epoch: 13143 pg[19.3bs10( v 3437'1759161 (3437'1759161,3437'175916
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9236> 2020-12-13T02:35:44.022+0000 7fafb521b700  5 osd.1 pg_epoch: 13143 pg[19.3bs10( v 3437'1759161 (3437'1759161,3437'175916
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9235> 2020-12-13T02:35:44.022+0000 7fafb521b700  1 osd.1 pg_epoch: 13143 pg[19.3bs10( v 3437'1759161 (3437'1759161,3437'175916
      >
      > And this is where it crashes:
      >
      > Dec 12 21:38:56 ceph-tpa-server1 bash[780507]: debug  -9232> 2020-12-13T02:35:44.022+0000 7fafd02c1700  0 log_channel(cluster) log [DBG] : purged_snaps scrub starts
      > Dec 12 21:38:57 ceph-tpa-server1 systemd[1]: ceph-08fa929a-8e23-11ea-a1a2-ac1f6bf83142@osd.1.service: Main process exited, code=exited, status=1/FAILURE
      > Dec 12 21:38:59 ceph-tpa-server1 systemd[1]: ceph-08fa929a-8e23-11ea-a1a2-ac1f6bf83142@osd.1.service: Failed with result 'exit-code'.
      > Dec 12 21:39:09 ceph-tpa-server1 systemd[1]: ceph-08fa929a-8e23-11ea-a1a2-ac1f6bf83142@osd.1.service: Service hold-off time over, scheduling restart.
      > Dec 12 21:39:09 ceph-tpa-server1 systemd[1]: ceph-08fa929a-8e23-11ea-a1a2-ac1f6bf83142@osd.1.service: Scheduled restart job, restart counter is at 1.
      > Dec 12 21:39:09 ceph-tpa-server1 systemd[1]: Stopped Ceph osd.1 for 08fa929a-8e23-11ea-a1a2-ac1f6bf83142.
      > Dec 12 21:39:09 ceph-tpa-server1 systemd[1]: Starting Ceph osd.1 for 08fa929a-8e23-11ea-a1a2-ac1f6bf83142...
      > Dec 12 21:39:09 ceph-tpa-server1 systemd[1]: Started Ceph osd.1 for 08fa929a-8e23-11ea-a1a2-ac1f6bf83142.
      >
      > Hope that helps…
      >
      >
      > Thanks,
      > Stefan
      >
      >
      > From: Stefan Wild <swild@xxxxxxxxxxxxx>
      > Date: Saturday, December 12, 2020 at 9:35 PM
      > To: "ceph-users@xxxxxxx" <ceph-users@xxxxxxx>
      > Subject: OSD reboot loop after running out of memory
      >
      > Hi,
      >
      > We recently upgraded a cluster from 15.2.1 to 15.2.5. About two days later, one of the server ran out of memory for unknown reasons (normally the machine uses about 60 out of 128 GB). Since then, some OSDs on that machine get caught in an endless restart loop. Logs will just mention system seeing the daemon fail and then restarting it. Since the out of memory incident, we’ve have 3 OSDs fail this way at separate times. We resorted to wiping the affected OSD and re-adding it to the cluster, but it seems as soon as all PGs have moved to the OSD, the next one fails.
      >
      > This is also keeping us from re-deploying RGW, which was affected by the same out of memory incident, since cephadm runs a check and won’t deploy the service unless the cluster is in HEALTH_OK status.
      >
      > Any help would be greatly appreciated.
      >
      > Thanks,
      > Stefan
      >
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