Ceph

-15> 2015-12-02 09:51:59.452750 7f879b7fe700 5 queue_op 0x7f8788023010 seq 1 osr(osbench 0x7f879b7fce80) 131278 bytes (queue has 1 ops and 131278 bytes)
-14> 2015-12-02 09:51:59.452766 7f87a1b3c700 12 KeyValueStore::op_tp worker wq KeyValueStore::OpWQ start processing 0x7f8788021c90 (1 active)
-13> 2015-12-02 09:51:59.452777 7f87a1b3c700 5 _do_op 0x7f8788023010 seq 1 osr(osbench 0x7f879b7fce80)/0x7f879b7fce80 start
-12> 2015-12-02 09:51:59.452781 7f87a1b3c700 10 _do_transaction on 0x7f8788020d90
-11> 2015-12-02 09:51:59.452794 7f87a1b3c700 15 _write 0.0_head/-2/00000000/osbench/head 0~131072
-10> 2015-12-02 09:51:59.452857 7f87a1b3c700 10 lookup_strip_header done cid 0.0_head oid -2/00000000/osbench/head
-9> 2015-12-02 09:51:59.452871 7f87a1b3c700 10 file_to_extents done
-8> 2015-12-02 09:51:59.453292 7f87a1b3c700 10 _generic_write 0.0_head/-2/00000000/osbench/head 0~131072 = 0
-7> 2015-12-02 09:51:59.453313 7f87a1b3c700 20 set_header setting 1 cid 0.0_head oid -2/00000000/osbench/head parent seq 0
-6> 2015-12-02 09:51:59.454126 7f87a1b3c700 5 submit_transaction r = 0
-5> 2015-12-02 09:51:59.454195 7f87a1b3c700 10 _do_op 0x7f8788023010 seq 1 r = 0, finisher 0 0
-4> 2015-12-02 09:51:59.454208 7f87a1b3c700 10 _finish_op 0x7f8788023010 seq 1 osr(osbench 0x7f879b7fce80)/0x7f879b7fce80 lat 0.001461
-3> 2015-12-02 09:51:59.454220 7f87a1b3c700 15 KeyValueStore::op_tp worker wq KeyValueStore::OpWQ done processing 0x7f8788021c90 (0 active)
-2> 2015-12-02 09:51:59.454223 7f87a1b3c700 20 KeyValueStore::op_tp worker waiting
-1> 2015-12-02 09:51:59.454307 7f87a5efd4c0 0 Wrote 128 KB in 1762us, at a rate of 72644 KB/s and 567 iops
0> 2015-12-02 09:51:59.455283 7f87a0b3a700 -1 common/Finisher.cc: In function 'void* Finisher::finisher_thread_entry()' thread 7f87a0b3a700 time 2015-12-02 09:51:59.454270
common/Finisher.cc: 74: FAILED assert(!ls_rval.empty())

ceph version 10.0.0-793-ge5c9e20 (e5c9e20a1689116e7f2fb019652a6b08eadf118e)
1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x8b) [0x7f87a636d3db]
2: (Finisher::finisher_thread_entry()+0xae1) [0x7f87a634c7b1]
3: (()+0x8182) [0x7f87a482a182]
4: (clone()+0x6d) [0x7f87a326030d]
NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.