rm -rf crash
mkdir crash
./src/monmaptool --create --clobber crash/monmap
./src/osdmaptool --clobber --createsimple 1 crash/osdmap
mkdir crash/mon0
cat >crash/ceph.conf <<EOF
[mon]
	mon data = crash/mon$id

[mon0]
 	mon addr = 127.0.0.1:6789
EOF
./src/monmaptool --add 0 127.0.0.1:6789 crash/monmap
./src/cmon --log-file=crash/cmon.log -c crash/ceph.conf --mkfs -i 0 --monmap crash/monmap --osdmap crash/osdmap
#mon/MonmapMonitor.cc: In function 'virtual void MonmapMonitor::encode_pending(ceph::bufferlist&)':
#mon/MonmapMonitor.cc:99: FAILED assert(mon->monmap->epoch + 1 == pending_map.epoch || pending_map.epoch == 1)