As the subject says... any ceph fs administrative command I try to run hangs forever and kills monitors in the background - sometimes they come back, on a couple of occasions I had to manually stop/restart a suffering mon. Trying to load the filesystem tab in the ceph-mgr dashboard dumps an error and can also kill a monitor. However, clients can mount the filesystem and read/write data without issue. Relevant excerpt from logs on an affected monitor, just trying to run 'ceph fs ls': 2017-09-26 13:20:50.716087 7fc85fdd9700 0 mon.vm-ds-01@0(leader) e19 handle_command mon_command({"prefix": "fs ls"} v 0) v1 2017-09-26 13:20:50.727612 7fc85fdd9700 0 log_channel(audit) log [DBG] : from='client.? 10.10.10.1:0/2771553898' entity='client.admin' cmd=[{"prefix": "fs ls"}]: dispatch 2017-09-26 13:20:50.950373 7fc85fdd9700 -1 /build/ceph-12.2.0/src/osd/OSDMap.h: In function 'const string& OSDMap::get_pool_name(int64_t) const' thread 7fc85fdd9700 time 2017-09-26 13:20:50.727676 /build/ceph-12.2.0/src/osd/OSDMap.h: 1176: FAILED assert(i != pool_name.end()) ceph version 12.2.0 (32ce2a3ae5239ee33d6150705cdb24d43bab910c) luminous (rc) 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x102) [0x55a8ca0bb642] 2: (()+0x48165f) [0x55a8c9f4165f] 3: (MDSMonitor::preprocess_command(boost::intrusive_ptr<MonOpRequest>)+0x1d18) [0x55a8ca047688] 4: (MDSMonitor::preprocess_query(boost::intrusive_ptr<MonOpRequest>)+0x2a8) [0x55a8ca048008] 5: (PaxosService::dispatch(boost::intrusive_ptr<MonOpRequest>)+0x700) [0x55a8c9f9d1b0] 6: (Monitor::handle_command(boost::intrusive_ptr<MonOpRequest>)+0x1f93) [0x55a8c9e63193] 7: (Monitor::dispatch_op(boost::intrusive_ptr<MonOpRequest>)+0xa0e) [0x55a8c9e6a52e] 8: (Monitor::_ms_dispatch(Message*)+0x6db) [0x55a8c9e6b57b] 9: (Monitor::ms_dispatch(Message*)+0x23) [0x55a8c9e9a053] 10: (DispatchQueue::entry()+0xf4a) [0x55a8ca3b5f7a] 11: (DispatchQueue::DispatchThread::entry()+0xd) [0x55a8ca16bc1d] 12: (()+0x76ba) [0x7fc86b3ac6ba] 13: (clone()+0x6d) [0x7fc869bd63dd] NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this. I'm running Luminous. The cluster and FS have been in service since Hammer and have default data/metadata pool names. I discovered the issue after attempting to enable directory sharding. Rich
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