Hi,
I just inherited a ceph storage. Therefore, my level of confidence with the tool is certainly less than ideal.
We currently have an mds server that refuses to come back online. While reviewing the logs, I can see that, upon mds start, the recovery goes well:
```
-10> 2023-05-03T08:12:43.632+0200 7f345d00b700 1 mds.4.2638711 cluster recovered.
12: (MDCache::_open_ino_traverse_dir(inodeno_t, MDCache::open_ino_info_t&, int)+0xbf) [0x558323d602df]
```
However, rights after this message, ceph handles a couple of clients request:
```
-9> 2023-05-03T08:12:43.632+0200 7f345d00b700 4 mds.4.2638711 set_osd_epoch_barrier: epoch=249241
-8> 2023-05-03T08:12:43.632+0200 7f3459003700 2 mds.4.cache Memory usage: total 2739784, rss 2321188, heap 348412, baseline 315644, 0 / 765023 inodes have caps, 0 caps, 0 caps per inode
-7> 2023-05-03T08:12:43.688+0200 7f3458802700 4 mds.4.server handle_client_request client_request(client.108396030:57271 lookup #0x70001516236/012385530.npy 2023-05-02T20:37:19.675666+0200 RETRY=6 caller_uid=135551, caller_gid=11157{0,4,27,11157,}) v5
-6> 2023-05-03T08:12:43.688+0200 7f3458802700 4 mds.4.server handle_client_request client_request(client.104073212:5109945 readdir #0x70001516236 2023-05-02T20:36:29.517066+0200 RETRY=6 caller_uid=180090, caller_gid=11157{0,4,27,11157,}) v5
-5> 2023-05-03T08:12:43.688+0200 7f3458802700 4 mds.4.server handle_client_request client_request(client.104288735:3008344 readdir #0x70001516236 2023-05-02T20:36:29.520801+0200 RETRY=6 caller_uid=135551, caller_gid=11157{0,4,27,11157,}) v5
-4> 2023-05-03T08:12:43.688+0200 7f3458802700 4 mds.4.server handle_client_request client_request(client.8558540:46306346 readdir #0x700019ba15e 2023-05-01T21:26:34.303697+0200 RETRY=49 caller_uid=0, caller_gid=0{}) v2
-3> 2023-05-03T08:12:43.688+0200 7f3458802700 4 mds.4.server handle_client_request client_request(client.96913903:2156912 create #0x1000b37db9a/street-photo-3.png 2023-05-01T17:27:37.454042+0200 RETRY=59 caller_uid=271932, caller_gid=30034{}) v2
-2> 2023-05-03T08:12:43.688+0200 7f345d00b700 5 mds.icadmin006 handle_mds_map old map epoch 2638715 <= 2638715, discarding
```
and crashes:
```
-1> 2023-05-03T08:12:43.692+0200 7f345d00b700 -1 /build/ceph-16.2.10/src/mds/Server.cc: In function 'void Server::handle_client_open(MDRequestRef&)' thread 7f345d00b700 time 2023-05-03T08:12:43.694660+0200
/build/ceph-16.2.10/src/mds/Server.cc: 4240: FAILED ceph_assert(cur->is_auth())
ceph version 16.2.10 (45fa1a083152e41a408d15505f594ec5f1b4fe17) pacific (stable)
1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x152) [0x7f3462533d65]
2: /usr/lib/ceph/libceph-common.so.2(+0x265f6d) [0x7f3462533f6d]
3: (Server::handle_client_open(boost::intrusive_ptr<MDRequestImpl>&)+0x1834) [0x558323c89f04]
4: (Server::handle_client_openc(boost::intrusive_ptr<MDRequestImpl>&)+0x28f) [0x558323c925ef]
5: (Server::dispatch_client_request(boost::intrusive_ptr<MDRequestImpl>&)+0xa45) [0x558323cc3575]
6: (MDCache::dispatch_request(boost::intrusive_ptr<MDRequestImpl>&)+0x3d) [0x558323d7460d]
7: (MDSContext::complete(int)+0x61) [0x558323f68681]
8: (MDCache::_open_remote_dentry_finish(CDentry*, inodeno_t, MDSContext*, bool, int)+0x3e) [0x558323d3edce]
9: (C_MDC_OpenRemoteDentry::finish(int)+0x3e) [0x558323de6cce]
10: (MDSContext::complete(int)+0x61) [0x558323f68681]
11: (MDCache::open_ino_finish(inodeno_t, MDCache::open_ino_info_t&, int)+0xcf) [0x558323d5ff2f]
12: (MDCache::_open_ino_traverse_dir(inodeno_t, MDCache::open_ino_info_t&, int)+0xbf) [0x558323d602df]
13: (MDSContext::complete(int)+0x61) [0x558323f68681]
14: (MDSRank::_advance_queues()+0x88) [0x558323c23c38]
15: (MDSRank::_dispatch(boost::intrusive_ptr<Message const> const&, bool)+0x1fa) [0x558323c24a1a]
16: (MDSRankDispatcher::ms_dispatch(boost::intrusive_ptr<Message const> const&)+0x5e) [0x558323c254fe]
17: (MDSDaemon::ms_dispatch2(boost::intrusive_ptr<Message> const&)+0x1d6) [0x558323bfd906]
18: (Messenger::ms_deliver_dispatch(boost::intrusive_ptr<Message> const&)+0x460) [0x7f34627854e0]
19: (DispatchQueue::entry()+0x58f) [0x7f3462782d7f]
20: (DispatchQueue::DispatchThread::entry()+0x11) [0x7f346284eee1]
21: /lib/x86_64-linux-gnu/libpthread.so.0(+0x8609) [0x7f3462278609]
22: clone()
0> 2023-05-03T08:12:43.700+0200 7f345d00b700 -1 *** Caught signal (Aborted) **
in thread 7f345d00b700 thread_name:ms_dispatch
ceph version 16.2.10 (45fa1a083152e41a408d15505f594ec5f1b4fe17) pacific (stable)
1: /lib/x86_64-linux-gnu/libpthread.so.0(+0x143c0) [0x7f34622843c0]
2: gsignal()
3: abort()
4: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x1ad) [0x7f3462533dc0]
5: /usr/lib/ceph/libceph-common.so.2(+0x265f6d) [0x7f3462533f6d]
6: (Server::handle_client_open(boost::intrusive_ptr<MDRequestImpl>&)+0x1834) [0x558323c89f04]
7: (Server::handle_client_openc(boost::intrusive_ptr<MDRequestImpl>&)+0x28f) [0x558323c925ef]
8: (Server::dispatch_client_request(boost::intrusive_ptr<MDRequestImpl>&)+0xa45) [0x558323cc3575]
9: (MDCache::dispatch_request(boost::intrusive_ptr<MDRequestImpl>&)+0x3d) [0x558323d7460d]
10: (MDSContext::complete(int)+0x61) [0x558323f68681]
11: (MDCache::_open_remote_dentry_finish(CDentry*, inodeno_t, MDSContext*, bool, int)+0x3e) [0x558323d3edce]
12: (C_MDC_OpenRemoteDentry::finish(int)+0x3e) [0x558323de6cce]
13: (MDSContext::complete(int)+0x61) [0x558323f68681]
14: (MDCache::open_ino_finish(inodeno_t, MDCache::open_ino_info_t&, int)+0xcf) [0x558323d5ff2f]
15: (MDCache::_open_ino_traverse_dir(inodeno_t, MDCache::open_ino_info_t&, int)+0xbf) [0x558323d602df]
16: (MDSContext::complete(int)+0x61) [0x558323f68681]
17: (MDSRank::_advance_queues()+0x88) [0x558323c23c38]
18: (MDSRank::_dispatch(boost::intrusive_ptr<Message const> const&, bool)+0x1fa) [0x558323c24a1a]
19: (MDSRankDispatcher::ms_dispatch(boost::intrusive_ptr<Message const> const&)+0x5e) [0x558323c254fe]
20: (MDSDaemon::ms_dispatch2(boost::intrusive_ptr<Message> const&)+0x1d6) [0x558323bfd906]
21: (Messenger::ms_deliver_dispatch(boost::intrusive_ptr<Message> const&)+0x460) [0x7f34627854e0]
22: (DispatchQueue::entry()+0x58f) [0x7f3462782d7f]
23: (DispatchQueue::DispatchThread::entry()+0x11) [0x7f346284eee1]
24: /lib/x86_64-linux-gnu/libpthread.so.0(+0x8609) [0x7f3462278609]
25: clone()
NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
--- logging levels ---
0/ 5 none
0/ 1 lockdep
0/ 1 context
1/ 1 crush
1/ 5 mds
1/ 5 mds_balancer
1/ 5 mds_locker
1/ 5 mds_log
1/ 5 mds_log_expire
1/ 5 mds_migrator
0/ 1 buffer
0/ 1 timer
0/ 1 filer
0/ 1 striper
0/ 1 objecter
0/ 5 rados
0/ 5 rbd
0/ 5 rbd_mirror
0/ 5 rbd_replay
0/ 5 rbd_pwl
0/ 5 journaler
0/ 5 objectcacher
0/ 5 immutable_obj_cache
0/ 5 client
1/ 5 osd
0/ 5 optracker
0/ 5 objclass
1/ 3 filestore
1/ 3 journal
0/ 0 ms
1/ 5 mon
0/10 monc
1/ 5 paxos
0/ 5 tp
1/ 5 auth
1/ 5 crypto
1/ 1 finisher
1/ 1 reserver
1/ 5 heartbeatmap
1/ 5 perfcounter
1/ 5 rgw
1/ 5 rgw_sync
1/10 civetweb
1/ 5 javaclient
1/ 5 asok
1/ 1 throttle
0/ 0 refs
1/ 5 compressor
1/ 5 bluestore
1/ 5 bluefs
1/ 3 bdev
1/ 5 kstore
4/ 5 rocksdb
4/ 5 leveldb
4/ 5 memdb
1/ 5 fuse
2/ 5 mgr
1/ 5 mgrc
1/ 5 dpdk
1/ 5 eventtrace
1/ 5 prioritycache
0/ 5 test
0/ 5 cephfs_mirror
0/ 5 cephsqlite
-2/-2 (syslog threshold)
-1/-1 (stderr threshold)
--- pthread ID / name mapping for recent threads ---
139862749464320 /
139862757857024 / md_submit
139862766249728 /
139862774642432 / MR_Finisher
139862791427840 / PQ_Finisher
139862799820544 / mds_rank_progr
139862808213248 / ms_dispatch
139862841784064 / ceph-mds
139862858569472 / safe_timer
139862875354880 / ms_dispatch
139862892140288 / io_context_pool
139862908925696 / admin_socket
139862917318400 / msgr-worker-2
139862925711104 / msgr-worker-1
139862934103808 / msgr-worker-0
139862951257984 / ceph-mds
max_recent 10000
max_new 10000
log_file /var/log/ceph/floki-mds.icadmin006.log
--- end dump of recent events ---
```
How could I troubleshoot that further?
Thanks in advance for your help,
Emmanuel
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