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(ITS#6137) Cancel(pending operation) acts like Abandon

Full_Name: Hallvard B Furuseth
Version: HEAD
Submission from: (NULL) (
Submitted by: hallvard

Looking at the code (not sure how to reproduce):

Cancel(pending operation) abandons the operation, without responding to
either Cancel or the cancelled operation.  That code in slapd/cancel.c
is copied from the equivalent abandon.c code.

Cancel as currently written must wait for the cancelled operation to
complete.  But an active operation must not wait for a pending one,
all threads could block.  For now we can make Cancel respond with

   LDAP_CANNOT_CANCEL: "can't handle Cancel now, try Abandon".

Repeating myself, a better fix (RE25?) would be to make the cancelled
operation send the Cancel response.  Don't how deep surgery that'd need
to slapd.