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This appears to affect both httpd and trafficserver plugins. Looks like low-hanging fruit I can easily fix.
An ib_conn_t struct is created for every connection, but never destroyed:
==1888== at 0x4C26FDE: malloc (vg_replace_malloc.c:236)
==1888== by 0xEA56939: ib_mpool_create_ex (mpool.c:90)
==1888== by 0xE8413BB: ib_conn_create (engine.c:381)
==1888== by 0xEC609FC: ironbee_plugin (ironbee.c:449)
Turns out this isn't the simple matter of adding ib_conn_destroy I supposed when this first showed up. That happens already in ib_state_notify_conn_closed. Evidently this is a deeper problem.
Yep. Just need to call ib_conn_destroy() after ib_state_notify_conn_closed() in the plugins. Please fix.
(Nevermind - just saw your other comment, which never got emailed to me)
With major recent changes to mpool code all mem leaks will be investigated as a task