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
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>
>
>
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