(ITS#7723) slapd crashes on multi core machines if a search request is *immediately* followed by an unbind

Full_Name: Michael Vishchers Version: 2.4.36 OS: RHEL 6.3 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (109.41.86.33)

The bug mentioned in ITS #7716 unfortunately still persists in 2.4.36.

We now found a way to reproduce it:

- make sure that threads can run freely (i.e., provide enough cpus) - start slapd with the rwm overlay - run a client loop that -- binds as a valid user -- sends a valid search request that is *immediately* (i.e., don't wait for any answers) followed by an unbind request

after several iterations (with 2.4.23 it was between 2 and 7, with 2.4.36 it was about 30) slapd crashes in malloc.c