Re: memory leaks report

[Peter Stephenson <pws@xxxxxxx>]

Felix Rosencrantz wrote:
> Here are the latest memory leaks found by valgrind from around March 6th.
> Most were all found before, but I didn't provide much context....  So here's
> a little more.  If there is a a simple way to force the tests to execute a
> separate shell per testcase, it would make it easier to link up the leaks to
> the test case.

You can set ZTST_verbose=2 in the environment to give more context
for the tests, so you can see when reports appear.  A separate shell
for each test is harder (and slower).

> Test E01options:
> Valgrind reports an error summary after every zsh subprocess exits.  Running
> the
> E01options test, there are 42 error summaries.  This leak is first reported=
>  in
> the 32nd error summary.  It looks like there are 48 tests.
> 493 bytes in 1 blocks are definitely lost in loss record 16 of 21
>    at  malloc (vg_replace_malloc.c:153)
>    by  zalloc (mem.c:490)
>    by  mkenvstr (params.c:3423)
>    by  addenv (params.c:3386)
>    by  restore_params (exec.c:2590)

Well, well, well, who would have thought it, a bug in the parameter
code.  I think it's the following, which looks like it should logically
be there in save_params to match the chunk in restore_params which is
causing the leak.

Index: Src/exec.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/exec.c,v
retrieving revision 1.57
diff -u -r1.57 exec.c
--- Src/exec.c	13 Nov 2003 14:34:38 -0000	1.57
+++ Src/exec.c	18 Mar 2004 11:43:38 -0000
@@ -2519,6 +2519,10 @@
     while (wc_code(ac = *pc) == WC_ASSIGN) {
 	s = ecrawstr(state->prog, pc + 1, NULL);
 	if ((pm = (Param) paramtab->getnode(paramtab, s))) {
+	    if (pm->env) {
+		delenv(pm->env);
+		pm->env = NULL;
+	    }
 	    if (!(pm->flags & PM_SPECIAL)) {
 		paramtab->removenode(paramtab, s);
 	    } else if (!(pm->flags & PM_READONLY) &&

-- 
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


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