[Issue 9421] SIGSEGV in the MMR synchro

OK, in trying to reproduce this problem with our own build, we found the several problems that caused the crash: * 2 servers were included in the replication config that were never provisioned * the first server had SID=0 * we were trying to replicate two DBs using a single accesslog db After we fixed this by: * removing the 2 servers from the config * starting SIDs at 1 instead of 0 * changed the logfilter value: - logfilter="(&(objectClass=auditWriteObject)(reqResult=0)" + logfilter="(&(objectClass=auditWriteObject)(reqResult=0)(reqDn: dnSubtreeMatch:={{ item.0.olcSuffix }}))" Everything starting working just fine and we can't reproduce the crash anymore. There are a log of invariants that the code expects but that aren't validated or documented (or the documentation is hard to find), sorry for wasting your time chasing this unicorn.