My current working theory is that the mgr is getting hung up when it tries
to scrape the device metrics from the mon. The 'tell' mechanism used to
send mon-targetted commands is pretty kludgey/broken in nautilus and
earlier. It's been rewritten for octopus, but isn't worth backporting--it
never really caused problems until the devicemanager started using it
heavily.
In any case, this PR just disables scraping of mon devices for nautilus:
https://github.com/ceph/ceph/pull/31446
There is a build queued at
https://shaman.ceph.com/repos/ceph/wip-no-scrape-mons-nautilus/d592e56e$
which should get packages in 1-2 hours.
Perhaps you can install that package on the mgr host and try again to
reproduce it again?
I noticed a few other oddities in the logs while looking through them,
like
https://tracker.ceph.com/issues/42666
which will hopefully have a fix ready for 14.2.5. I'm not sure about that
auth error message, though!
sage
On Sat, 2 Nov 2019, Oliver Freyermuth wrote:
> Dear Sage,
>
> good news - it happened again, with debug logs!
> There's nothing obvious to my eye, it's uploaded as:
> 0b2d0c09-46f3-4126-aa27-e2d2e8572741
> It seems the failure was roughly in parallel to me wanting to access the dashboard. It must have happened within the last ~5-10 minutes of the log.
>
> I'll now go back to "stable operation", in case you need anything else, just let me know.
>
> Cheers and all the best,
> Oliver
>
> Am 02.11.19 um 17:38 schrieb Oliver Freyermuth:
> > Dear Sage,
> >
> > at least for the simple case:
> > ceph device get-health-metrics osd.11
> > => mgr crashes (but in that case, it crashes fully, i.e. the process is gone)
> > I have now uploaded a verbose log as:
> > ceph-post-file: e3bd60ad-cbce-4308-8b07-7ebe7998572e
> >
> > One potential cause of this (and maybe the other issues) might be because some of our OSDs are on non-JBOD controllers and hence are made by forming a Raid 0 per disk,
> > so a simple smartctl on the device will not work (but -dmegaraid,<number> would be needed).
> >
> > Now I have both mgrs active again, debug logging on, device health metrics on again,
> > and am waiting for them to become silent again. Let's hope the issue reappears before the disks run full of logs ;-).
> >
> > Cheers,
> > Oliver
> >
> > Am 02.11.19 um 02:56 schrieb Sage Weil:
> >> On Sat, 2 Nov 2019, Oliver Freyermuth wrote:
> >>> Dear Cephers,
> >>>
> >>> interestingly, after:
> >>> ceph device monitoring off
> >>> the mgrs seem to be stable now - the active one still went silent a few minutes later,
> >>> but the standby took over and was stable, and restarting the broken one, it's now stable since an hour, too,
> >>> so probably, a restart of the mgr is needed after disabling device monitoring to get things stable again.
> >>>
> >>> So it seems to be caused by a problem with the device health metrics. In case this is a red herring and mgrs become instable again in the next days,
> >>> I'll let you know.
> >>
> >> If this seems to stabilize things, and you can tolerate inducing the
> >> failure again, reproducing the problem with mgr logs cranked up (debug_mgr
> >> = 20, debug_ms = 1) would probably give us a good idea of why the mgr is
> >> hanging. Let us know!
> >>
> >> Thanks,
> >> sage
> >>
> >> >
> >>> Cheers,
> >>> Oliver
> >>>
> >>> Am 01.11.19 um 23:09 schrieb Oliver Freyermuth:
> >>>> Dear Cephers,
> >>>>
> >>>> this is a 14.2.4 cluster with device health metrics enabled - since about a day, all mgr daemons go "silent" on me after a few hours, i.e. "ceph -s" shows:
> >>>>
> >>>> cluster:
> >>>> id: 269cf2b2-7e7c-4ceb-bd1b-a33d915ceee9
> >>>> health: HEALTH_WARN
> >>>> no active mgr
> >>>> 1/3 mons down, quorum mon001,mon002
> >>>>
> >>>> services:
> >>>> mon: 3 daemons, quorum mon001,mon002 (age 57m), out of quorum: mon003
> >>>> mgr: no daemons active (since 56m)
> >>>> ...
> >>>> (the third mon has a planned outage and will come back in a few days)
> >>>>
> >>>> Checking the logs of the mgr daemons, I find some "reset" messages at the time when it goes "silent", first for the first mgr:
> >>>>
> >>>> 2019-11-01 21:34:40.286 7f2df6a6b700 0 log_channel(cluster) log [DBG] : pgmap v1798: 1585 pgs: 1585 active+clean; 1.1 TiB data, 2.3 TiB used, 136 TiB / 138 TiB avail
> >>>> 2019-11-01 21:34:41.458 7f2e0d59b700 0 client.0 ms_handle_reset on v2:10.160.16.1:6800/401248
> >>>> 2019-11-01 21:34:42.287 7f2df6a6b700 0 log_channel(cluster) log [DBG] : pgmap v1799: 1585 pgs: 1585 active+clean; 1.1 TiB data, 2.3 TiB used, 136 TiB / 138 TiB avail
> >>>>
> >>>> and a bit later, on the standby mgr:
> >>>>
> >>>> 2019-11-01 22:18:14.892 7f7bcc8ae700 0 log_channel(cluster) log [DBG] : pgmap v1798: 1585 pgs: 166 active+clean+snaptrim, 858 active+clean+snaptrim_wait, 561 active+clean; 1.1 TiB data, 2.3 TiB used, 136 TiB / 138 TiB avail
> >>>> 2019-11-01 22:18:16.022 7f7be9e72700 0 client.0 ms_handle_reset on v2:10.160.16.2:6800/352196
> >>>> 2019-11-01 22:18:16.893 7f7bcc8ae700 0 log_channel(cluster) log [DBG] : pgmap v1799: 1585 pgs: 166 active+clean+snaptrim, 858 active+clean+snaptrim_wait, 561 active+clean; 1.1 TiB data, 2.3 TiB used, 136 TiB / 138 TiB avail
> >>>>
> >>>> Interestingly, the dashboard still works, but presents outdated information, and for example zero I/O going on.
> >>>> I believe this started to happen mainly after the third mon went into the known downtime, but I am not fully sure if this was the trigger, since the cluster is still growing.
> >>>> It may also have been the addition of 24 more OSDs.
> >>>>
> >>>>
> >>>> I also find other messages in the mgr logs which seem problematic, but I am not sure they are related:
> >>>> ------------------------------
> >>>> 2019-11-01 21:17:09.849 7f2df4266700 0 mgr[devicehealth] Error reading OMAP: [errno 22] Failed to operate read op for oid
> >>>> Traceback (most recent call last):
> >>>> File "/usr/share/ceph/mgr/devicehealth/module.py", line 396, in put_device_metrics
> >>>> ioctx.operate_read_op(op, devid)
> >>>> File "rados.pyx", line 516, in rados.requires.wrapper.validate_func (/home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge/release/14.2.4/rpm/el7/BUIL
> >>>> D/ceph-14.2.4/build/src/pybind/rados/pyrex/rados.c:4721)
> >>>> File "rados.pyx", line 3474, in rados.Ioctx.operate_read_op (/home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge/release/14.2.4/rpm/el7/BUILD/ceph-14.2.4/build/src/pybind/rados/pyrex/rados.c:36554)
> >>>> InvalidArgumentError: [errno 22] Failed to operate read op for oid
> >>>> ------------------------------
> >>>> or:
> >>>> ------------------------------
> >>>> 2019-11-01 21:33:53.977 7f7bd38bc700 0 mgr[devicehealth] Fail to parse JSON result from daemon osd.51 ()
> >>>> 2019-11-01 21:33:53.978 7f7bd38bc700 0 mgr[devicehealth] Fail to parse JSON result from daemon osd.52 ()
> >>>> 2019-11-01 21:33:53.979 7f7bd38bc700 0 mgr[devicehealth] Fail to parse JSON result from daemon osd.53 ()
> >>>> ------------------------------
> >>>>
> >>>> The reason why I am cautious about the health metrics is that I observed a crash when trying to query them:
> >>>> ------------------------------
> >>>> 2019-11-01 20:21:23.661 7fa46314a700 0 log_channel(audit) log [DBG] : from='client.174136 -' entity='client.admin' cmd=[{"prefix": "device get-health-metrics", "devid": "osd.11", "target": ["mgr", ""]}]: dispatch
> >>>> 2019-11-01 20:21:23.661 7fa46394b700 0 mgr[devicehealth] handle_command
> >>>> 2019-11-01 20:21:23.663 7fa46394b700 -1 *** Caught signal (Segmentation fault) **
> >>>> in thread 7fa46394b700 thread_name:mgr-fin
> >>>>
> >>>> ceph version 14.2.4 (75f4de193b3ea58512f204623e6c5a16e6c1e1ba) nautilus (stable)
> >>>> 1: (()+0xf5f0) [0x7fa488cee5f0]
> >>>> 2: (PyEval_EvalFrameEx()+0x1a9) [0x7fa48aeb50f9]
> >>>> 3: (PyEval_EvalFrameEx()+0x67bd) [0x7fa48aebb70d]
> >>>> 4: (PyEval_EvalFrameEx()+0x67bd) [0x7fa48aebb70d]
> >>>> 5: (PyEval_EvalFrameEx()+0x67bd) [0x7fa48aebb70d]
> >>>> 6: (PyEval_EvalCodeEx()+0x7ed) [0x7fa48aebe08d]
> >>>> 7: (()+0x709c8) [0x7fa48ae479c8]
> >>>> 8: (PyObject_Call()+0x43) [0x7fa48ae22ab3]
> >>>> 9: (()+0x5aaa5) [0x7fa48ae31aa5]
> >>>> 10: (PyObject_Call()+0x43) [0x7fa48ae22ab3]
> >>>> 11: (()+0x4bb95) [0x7fa48ae22b95]
> >>>> 12: (PyObject_CallMethod()+0xbb) [0x7fa48ae22ecb]
> >>>> 13: (ActivePyModule::handle_command(std::map<std::string, boost::variant<std::string, bool, long, double, std::vector<std::string, std::allocator<std::string> >, std::vector<long, std::allocator<long> >, std::vector<double, std::allocator<double> > >, std::less<void>, std::allocator<std::pair<std::string const, boost::variant<std::string, bool, long, double, std::vector<std::string, std::allocator<std::string> >, std::vector<long, std::allocator<long> >, std::vector<double, std::allocator<double> > > > > > const&, ceph::buffer::v14_2_0::list const&, std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*, std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*)+0x20e) [0x55c3c1fefc5e]
> >>>> 14: (()+0x16c23d) [0x55c3c204023d]
> >>>> 15: (FunctionContext::finish(int)+0x2c) [0x55c3c2001eac]
> >>>> 16: (Context::complete(int)+0x9) [0x55c3c1ffe659]
> >>>> 17: (Finisher::finisher_thread_entry()+0x156) [0x7fa48b439cc6]
> >>>> 18: (()+0x7e65) [0x7fa488ce6e65]
> >>>> 19: (clone()+0x6d) [0x7fa48799488d]
> >>>> NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
> >>>> ------------------------------
> >>>>
> >>>> I have issued:
> >>>> ceph device monitoring off
> >>>> for now and will keep waiting to see if mgrs go silent again. If there are any better ideas or this issue is known, let me know.
> >>>>
> >>>> Cheers,
> >>>> Oliver
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> ceph-users mailing list -- ceph-users@xxxxxxx
> >>>> To unsubscribe send an email to ceph-users-leave@xxxxxxx
> >>>>
> >>>
> >
> >
> > _______________________________________________
> > ceph-users mailing list -- ceph-users@xxxxxxx
> > To unsubscribe send an email to ceph-users-leave@xxxxxxx
> >
>
>
>
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