!!! THIS IS A MAJOR BUG FOR ANYONE RUNNING CGI SCRIPTS IN AOLSERVER 3.x !!!
This bug exists in released versions of AOLserver 3.x inclusive of AOLserver 3.5.1 all the way back to AOLserver 3.0. Any past or current reports of AOLserver 3.x growing in size over time should be re-examined with this bug in mind.
The leak has been fixed in the CVS tree for AOLserver 3 (3.5 branch). AOLserver 4.x's nscgi module is *not* affected by this problem.
If you wish to fix the problem in your current version of AOLserver 3.x, edit the aolserver/nscgi/nscgi.c file, find the CgiExec function, and delete the call to "Ns_DStringInit(dsPtr);". Then recompile your server. Here is what it looks like in context:
/*
* Set all the CGI specified variables.
*/ Ns_DStringInit(dsPtr);
SetUpdate(cgiPtr->env, "SCRIPT_NAME", cgiPtr->name);
if (cgiPtr->pathinfo != NULL && *cgiPtr->pathinfo != '\0') {
Ns_DString tmp;
...Notes:
The leak occurred in the CgiExec function of nscgi.c. The nscgi.c file defines a function called CgiDs which does an Ns_DStringPop to obtain a dstring, and then uses that dstring's 'addr' member to maintain a linked-list of dstrings that nscgi is currently using. At the end of the CGI process, the CgiFree function is called to walk through that linked-list and perform an Ns_DStringPush on each of the dstrings to put them back into the thread's local dstring pool.
The memory leak was caused when Ns_DStringInit was called and passed a dstring obtained by a previous call to CgiDs. The Ns_DStringInit call broke the linked-lisk because it NULL'd the addr member of the dstring, which had been pointing to the next dstring in the linked-list. The effect was that every invocation of of a CGI script was causing dstrings to be left dangling in memory.
This problem *does not* exist in AOLserver 4.x because nscgi no longer uses Ns_DString's addr member to maintain the linked list.
/s.
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