This PR doesn't have any effect on the assertion. I still get it in same situation --- $ ./fio --ioengine=rbd --invalidate=0 --rw=write --bs=10M --numjobs=1 --clientname=admin --pool=rbd --iodepth=128 --rbdname=img2g --name=1 1: (g=0): rw=write, bs=10M-10M/10M-10M/10M-10M, ioengine=rbd, iodepth=128 fio-2.13-91-gb678 Starting 1 process rbd engine: RBD version: 0.1.11 /mnt/data/avnerb/rpmbuild/BUILD/ceph-11.0.2-1611-geb25965/src/log/SubsystemMap.h: In function 'bool ceph::logging::SubsystemMap::should_gather(unsigned int, int)' thread 7f7c7b3a5700 time 2016-11-20 13:17:56.090289 /mnt/data/avnerb/rpmbuild/BUILD/ceph-11.0.2-1611-geb25965/src/log/SubsystemMap.h: 62: FAILED assert(sub < m_subsys.size()) ceph version 11.0.2-1611-geb25965 (eb25965b74aa1a0379d091169d80786f30c72a8b) --- > -----Original Message----- > From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel- > owner@xxxxxxxxxxxxxxx] On Behalf Of Haomai Wang > Subject: Re: ceph issue > > sorry, I got the issue. I submitted a > pr(https://github.com/ceph/ceph/pull/12068). plz tested with this. ��.n��������+%������w��{.n����z��u���ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f