Ceph

This is on https://github.com/ceph/ceph/pull/39066/
Run: https://pulpito.ceph.com/teuthology-2021-01-25_20:01:21-upgrade:octopus-x:parallel-no-cephadm-pacific-distro-basic-gibba/
Jobs: all
Logs: http://qa-proxy.ceph.com/teuthology/teuthology-2021-01-25_20:01:21-upgrade:octopus-x:parallel-no-cephadm-pacific-distro-basic-gibba/5828460/teuthology.log

failure_reason: 'Command failed on smithi201 with status 1: ''sudo adjust-ulimits
  ceph-coverage /home/ubuntu/cephtest/archive/coverage daemon-helper kill ceph-mds
  -f --cluster ceph -i a'''

 ceph version 15.2.8-228-gc676cbb9 (c676cbb9be59cfb21bd2ba9250035305ff2c9719) octopus (stable)
 1: (ceph::__ceph_abort(char const*, int, char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)+0xe1) [0x7f508fc778be]
 2: (DecodeConfigPayloadVisitor const::result_type boost::variant<OSDConfigPayload, UnknownConfigPayload>::apply_visitor<DecodeConfigPayloadVisitor const>(DecodeConfigPayloadVisitor const&) &+0xee) [0x7f508feee6fe]
 3: (MMgrConfigure::decode_payload()+0x1521) [0x7f508fef3d31]
 4: (decode_message(ceph::common::CephContext*, int, ceph_msg_header&, ceph_msg_footer&, ceph::buffer::v15_2_0::list&, ceph::buffer::v15_2_0::list&, ceph::buffer::v15_2_0::list&, boost::intrusive_ptr<Connection>)+0x15cd) [0x7f508fe71f4d]
 5: (ProtocolV2::handle_message()+0x406) [0x7f508ff38576]
 6: (ProtocolV2::handle_read_frame_dispatch()+0x160) [0x7f508ff4aaa0]
 7: (ProtocolV2::_handle_read_frame_epilogue_main()+0x69) [0x7f508ff4abf9]
 8: (ProtocolV2::handle_read_frame_epilogue_main(std::unique_ptr<ceph::buffer::v15_2_0::ptr_node, ceph::buffer::v15_2_0::ptr_node::disposer>&&, int)+0x61) [0x7f508ff4c471]
 9: (ProtocolV2::run_continuation(Ct<ProtocolV2>&)+0x34) [0x7f508ff347b4]
 10: (AsyncConnection::process()+0x5fc) [0x7f508feff41c]
 11: (EventCenter::process_events(unsigned int, std::chrono::duration<unsigned long, std::ratio<1l, 1000000000l> >*)+0x7dd) [0x7f508ff555ed]
 12: (()+0x553288) [0x7f508ff5d288]
 13: (()+0xbd6df) [0x7f508f0ab6df]
 14: (()+0x76db) [0x7f508f5826db]
 15: (clone()+0x3f) [0x7f508e76871f]

Per Josh "the mds is crashing due to an incompatibility with a message from the mgr" might an issue "with octopus mds + pacific mgr"