[mapserver-dev] 5.2.0 memory leaks?

[Stephen Woodbridge]

Steve L,

I have been playing around with a test program to generate some images. 
It was some mapscript that I wanted to see if I could get working as a C 
program calling the mapserver library calls.

This run was based on mapserver-5.2.0-beta2 and it looks like we have 
some memory leaks in the mapserver code. It is also possible that I 
mis-used the library, but these seem to be pretty deep in mapserver and 
I'm not trying to do anything fancy.

I'll check the same run against RC1, but I guess my generic question is 
how much check has been done with valgrind. This run only generates two 
images, but if I wanted to generate lots more this could be serious. In 
fact, I think I've seen php/mapscript precache2.php run into a leak 
where the process kept growing and finally died and had to be restarted.

-Steve


==5821== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 3 from 1)
==5821== malloc/free: in use at exit: 7,724 bytes in 29 blocks.
==5821== malloc/free: 337,243 allocs, 337,214 frees, 121,668,226 bytes 
allocated.
==5821== For counts of detected errors, rerun with: -v
==5821== searching for pointers to 29 not-freed blocks.
==5821== checked 15,450,752 bytes.
==5821==
==5821== 24 bytes in 3 blocks are definitely lost in loss record 5 of 15
==5821==    at 0x4A18DA3: malloc (vg_replace_malloc.c:149)
==5821==    by 0x4276A1: msLayerWhichItems (maplayer.c:440)
==5821==    by 0x42A20D: msDrawVectorLayer (mapdraw.c:841)
==5821==    by 0x429E44: msDrawLayer (mapdraw.c:738)
==5821==    by 0x429A73: msDrawMap (mapdraw.c:441)
==5821==    by 0x40E67E: main (genimages.c:1112)
==5821==
==5821==
==5821== 24 bytes in 4 blocks are definitely lost in loss record 6 of 15
==5821==    at 0x4A18DA3: malloc (vg_replace_malloc.c:149)
==5821==    by 0x4B35D78: gdMalloc (in /usr/lib/libgd.so.2.0.33)
==5821==    by 0x4B33830: (within /usr/lib/libgd.so.2.0.33)
==5821==    by 0x4B336DB: gdImageCreatePaletteFromTrueColor (in 
/usr/lib/libgd.so.2.0.33)
==5821==    by 0x43ACED: msImageCreateWithPaletteGD (mapgd.c:3441)
==5821==    by 0x43B022: msSaveImageGDCtx (mapgd.c:3576)
==5821==    by 0x43AE2F: msSaveImageGD (mapgd.c:3495)
==5821==    by 0x4437A8: msSaveImageAGG (mapagg.cpp:2216)
==5821==    by 0x41ACB4: msSaveImage (maputil.c:657)
==5821==    by 0x40E6B4: main (genimages.c:1120)
==5821==
==5821==
==5821== 66 (48 direct, 18 indirect) bytes in 3 blocks are definitely 
lost in loss record 11 of 15
==5821==    at 0x4A1A362: calloc (vg_replace_malloc.c:279)
==5821==    by 0x427680: msLayerWhichItems (maplayer.c:435)
==5821==    by 0x42A20D: msDrawVectorLayer (mapdraw.c:841)
==5821==    by 0x429E44: msDrawLayer (mapdraw.c:738)
==5821==    by 0x429A73: msDrawMap (mapdraw.c:441)
==5821==    by 0x40E67E: main (genimages.c:1112)
==5821==
==5821== LEAK SUMMARY:
==5821==    definitely lost: 96 bytes in 10 blocks.
==5821==    indirectly lost: 18 bytes in 3 blocks.
==5821==      possibly lost: 0 bytes in 0 blocks.
==5821==    still reachable: 7,610 bytes in 16 blocks.
==5821==         suppressed: 0 bytes in 0 blocks.
==5821== Reachable blocks (those to which a pointer was found) are not 
shown.
==5821== To see them, rerun with: --show-reachable=yes