(ITS#8043) syncprov abandon bug

[hyc@openldap.org]

Full_Name: Howard Chu
Version: 2.4
OS: 
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (180.180.122.131)
Submitted by: hyc


Yet another related to cleanup after an abandon: if there is an outstanding
psearch task when the abandon occurs, the syncop may get freed without getting
removed from the si_ops list. A subsequent attempt to walk the si_ops list will
go thru this freed record (and usually crash).