OK, issue resolved:
modsecurity v2.6.2 appears to have fixed the memory leak issue that
I was experiencing when using ruleUpdateTargetById.
On Tue, 1 Nov 2011, Ryan Barnett wrote:
> There were some fixes in v2.6.2 related to updating target lists. I would
> test with v2.6.2 and see if you still have the same issues.
> On 11/1/11 2:00 PM, "rp-modsec-list@..." <rp-modsec-list@...>
>> There appears to be a significant memory leak when using modsecurity 2.6.1
>> with the new ruleUpdateTargetById directive.