(ITS#4120) blocked writer never wakes up

[hyc@OpenLDAP.org]

Full_Name: Howard Chu
Version: HEAD
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (24.126.120.178)
Submitted by: hyc


While investigating ITS#4108 I ran into a situation with a remote client hanging
in a search request. Debugging on the client shows that only a partial search
message is received, and nothing further is sent by slapd. Clients running local
to the slapd host never seem to have this problem.