result of latest memory leak run

result of latest memory leak run

[Felix Rosencrantz]

I ran the latest cvs version of zsh with valgrind in my environment as my main
shell for a few days.    I was only able to find one memory leak, I believe
based on the recent fix for (l=() ; vared l):  
==21338== 520 bytes in 3 blocks are definitely lost in loss record 9 of 14
==21338==    at 0x401667E0: malloc (vg_clientfuncs.c:103)
==21338==    by 0x8086AF5: zalloc (mem.c:490)
==21338==    by 0x81008E9: zleread (zle_main.c:790)
==21338==    by 0x8101D07: bin_vared (zle_main.c:1149)
==21338==    by 0x804B2F5: execbuiltin (builtin.c:440)
==21338==    by 0x806193A: execcmd (exec.c:2345)
==21338==    by 0x805E24E: execpline2 (exec.c:1228)
==21338==    by 0x805D776: execpline (exec.c:1018)

I suspect folks could find other leaks or memory errors if they valgrind zsh in
their environments.

-FR.




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Re: result of latest memory leak run

[Peter Stephenson]

Felix Rosencrantz wrote:
> I ran the latest cvs version of zsh with valgrind in my environment as
> my main shell for a few days.    I was only able to find one memory
> leak, I believe based on the recent fix for (l=() ; vared l):  
> ==21338== 520 bytes in 3 blocks are definitely lost in loss record 9 of 14
> ==21338==    at 0x401667E0: malloc (vg_clientfuncs.c:103)
> ==21338==    by 0x8086AF5: zalloc (mem.c:490)
> ==21338==    by 0x81008E9: zleread (zle_main.c:790)
> ==21338==    by 0x8101D07: bin_vared (zle_main.c:1149)
> ==21338==    by 0x804B2F5: execbuiltin (builtin.c:440)
> ==21338==    by 0x806193A: execcmd (exec.c:2345)
> ==21338==    by 0x805E24E: execpline2 (exec.c:1228)
> ==21338==    by 0x805D776: execpline (exec.c:1018)

Actually, it's older; any vared of an array will leak the string since
spacesplit() doesn't free it.  I think this may explain some of your
previous leaks, so it's good to chase it down.

The fact there's a comment but it's already inaccurate suggests I was
working here.

I think a test-3 is probably warranted.  There's no point rushing things
now.

Index: Src/Zle/zle_main.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/zle_main.c,v
retrieving revision 1.32
diff -u -r1.32 zle_main.c
--- Src/Zle/zle_main.c	14 May 2003 15:09:15 -0000	1.32
+++ Src/Zle/zle_main.c	19 May 2003 09:59:52 -0000
@@ -1177,9 +1177,10 @@
 
 	/*
 	 * Use spacesplit with fourth argument 1: identify quoted separators,
-	 * unquote but don't split.
+	 * and unquote.  This duplicates the string, so we still need to free.
 	 */
 	a = spacesplit(t, 1, 0, 1);
+	zsfree(t);
 	if (PM_TYPE(pm->flags) == PM_ARRAY)
 	    setaparam(args[0], a);
 	else

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


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