In back-ldbm/perfctrs.c in the init_shared_memory() function, memset() is called
with the 2nd and 3rd parameters reversed:

  memset(perf,sizeof(performance_counters),0);

It looks like init_shared_memory() is only called on Windows (where the
performance counters reside in shared memory instead of process memory).  I am
not sure if this causes any problems or not; perhaps the memory is cleared
elsewhere.

I found this using Google code search in someone's tarball of Fedora DS 1.02 and
then I confirmed this still exists in the trunk code by using lxr.