We are Ceph Luminous 12.2.13-0 in one of our clusters and we are observing OSDs flapping. The stack trace we have from the OSDs that went down is given below : /var/log/ceph/ceph-osd.27.log:/home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge /release/12.2.12/rpm/el7/BUILD/ceph-12.2.12/src/osd/ECTransaction.h: 179: FAILED assert(plan.to_read.count(i.first) == 0 || (!plan.to_read.at(i.first).empty() && !i .second.has_source())) We have seen a similar bug raised at https://tracker.ceph.com/issues/21756 But the fix has been given in nautilus version (https://github.com/ceph/ceph/pull/18241/commits/fb50f43244f0a9bc59f9aa4e231…) Please let us know if we can backport the same fix in Luminous or is there something else we can do to fix the issue. Thanks!