Assertion failed -- possible to get this from a query?

[David Stults <david@stults.com>]

Hello everyone,

Quite suddenly this evening my slapd (2.0.18) aborted, and when I 
restarted it, it would run for between 1 second and about 20 seconds 
before aborting again.  In debug mode, I see this error:

schema_init.c:622: failed assertion `!ldap_utf8_isspace( 
LDAP_UTF8_PREV(q) )'

And by watching the query log, I noticed that the last query before it 
dies (as best I can tell, considering how many queries per second are 
executed), is always from one particular mail server.  What I'm asking 
is this -- can a malformed query cause the above error to occur?  The 
optimistic part of my personality insists that slapd should not be 
crashable with a malformed query.  The realistic side of my personality 
isn't so sure ;-).

If anyone can shed some light on what I'm seeing, and on whether or not 
it could be do to a messed up query, I'd appreciate it.  Also, if anyone 
here is bright enough to tell me what's actually failing (I read the 
source code a bit, but I wasn't able to come up with a concrete answer) 
when this error occurs, that would be great to.  I'll be taking that 
particular question to the development list, I think.

Thanks!

Sincerely,
David Stults