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(ITS#6736) Listener info destroyed too early on shutdown
Full_Name: Hallvard B Furuseth
Submission from: (NULL) (126.96.36.199)
Submitted by: hallvard
On shutdown, slapd_daemon_task() calls close_listeners() which destroys
slap_listeners while other threads may be accessing it. This is not
mutex-protected. Valgrind reports freed data accesses in back-monitor
and slapd_listener() when they try to read the URLs in the listeners.
Giving HEAD a minimal fix: Stop listening but delay destruction.
If anyone feels like it, the new 'listening' flag probably can be used
more intelligently, e.g. by rearranging the use of it and some shutdown