reassign 590640 valgrind
thanks
This is a bug in valgrind.
There is a bug open already, I thought I marked it as critical as
because of that valgrind is unusable, but I can't find it anymore.
On Wed, Jul 28, 2010 at 03:48:24AM +0300, Petri Latvala wrote:
> Package: libc6
> Version: 2.11.2-2
> Severity: normal
>
>
> --- BEGIN TESTCASE PROGRAM ---
> #include <string.h>
> #include <stdlib.h>
>
> int main()
> {
> char* x = malloc(5);
> char* y = malloc(5);
> int foo;
>
> strcpy(x, "helo");
> strcpy(y, "ehlo");
>
> foo = strcmp(x, y);
> foo = strncmp(x, y, 4);
>
> free(x);
> free(y);
>
> return 0;
> }
> --- END TESTCASE PROGRAM ---
>
> Running the program in valgrind results in the following log:
>
>
> --- BEGIN LOG ---
> ==5447== Memcheck, a memory error detector
> ==5447== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
> ==5447== Using Valgrind-3.5.0-Debian and LibVEX; rerun with -h for copyright
> info
> ==5447== Command: ./strcmp
> ==5447== Parent PID: 5379
> ==5447==
> ==5447== Conditional jump or move depends on uninitialised value(s)
> ==5447== at 0x4016236: index (strchr.S:56)
> ==5447== by 0x4007164: expand_dynamic_string_token (dl-load.c:324)
> ==5447== by 0x4007567: _dl_map_object (dl-load.c:2173)
> ==5447== by 0x400186A: map_doit (rtld.c:634)
> ==5447== by 0x400D5C5: _dl_catch_error (dl-error.c:178)
> ==5447== by 0x400176E: do_preload (rtld.c:818)
> ==5447== by 0x40043F1: dl_main (rtld.c:1678)
> ==5447== by 0x4014776: _dl_sysdep_start (dl-sysdep.c:243)
> ==5447== by 0x4001422: _dl_start (rtld.c:338)
> ==5447== by 0x4000AF7: ??? (in /lib/ld-2.11.2.so)
> ==5447==
> ==5447== Conditional jump or move depends on uninitialised value(s)
> ==5447== at 0x401623B: index (strchr.S:59)
> ==5447== by 0x4007164: expand_dynamic_string_token (dl-load.c:324)
> ==5447== by 0x4007567: _dl_map_object (dl-load.c:2173)
> ==5447== by 0x400186A: map_doit (rtld.c:634)
> ==5447== by 0x400D5C5: _dl_catch_error (dl-error.c:178)
> ==5447== by 0x400176E: do_preload (rtld.c:818)
> ==5447== by 0x40043F1: dl_main (rtld.c:1678)
> ==5447== by 0x4014776: _dl_sysdep_start (dl-sysdep.c:243)
> ==5447== by 0x4001422: _dl_start (rtld.c:338)
> ==5447== by 0x4000AF7: ??? (in /lib/ld-2.11.2.so)
> ==5447==
> ==5447== Conditional jump or move depends on uninitialised value(s)
> ==5447== at 0x400AC3E: _dl_relocate_object (do-rel.h:65)
> ==5447== by 0x400383A: dl_main (rtld.c:2297)
> ==5447== by 0x4014776: _dl_sysdep_start (dl-sysdep.c:243)
> ==5447== by 0x4001422: _dl_start (rtld.c:338)
> ==5447== by 0x4000AF7: ??? (in /lib/ld-2.11.2.so)
> ==5447==
> ==5447== Conditional jump or move depends on uninitialised value(s)
> ==5447== at 0x400AC47: _dl_relocate_object (do-rel.h:68)
> ==5447== by 0x400383A: dl_main (rtld.c:2297)
> ==5447== by 0x4014776: _dl_sysdep_start (dl-sysdep.c:243)
> ==5447== by 0x4001422: _dl_start (rtld.c:338)
> ==5447== by 0x4000AF7: ??? (in /lib/ld-2.11.2.so)
> ==5447==
> ==5447== Invalid read of size 8
> ==5447== at 0x4F35356: __strcmp_ssse3 (strcmp.S:99)
> ==5447== by 0x40068C: main (strcmp.c:13)
> ==5447== Address 0x5189040 is 0 bytes inside a block of size 5 alloc'd
> ==5447== at 0x4C241A7: malloc (vg_replace_malloc.c:195)
> ==5447== by 0x400635: main (strcmp.c:6)
> ==5447==
> ==5447== Invalid read of size 8
> ==5447== at 0x4F3535A: __strcmp_ssse3 (strcmp.S:100)
> ==5447== by 0x40068C: main (strcmp.c:13)
> ==5447== Address 0x5189090 is 0 bytes inside a block of size 5 alloc'd
> ==5447== at 0x4C241A7: malloc (vg_replace_malloc.c:195)
> ==5447== by 0x400643: main (strcmp.c:7)
> ==5447==
> ==5447== Invalid read of size 8
> ==5447== at 0x4F3535E: __strcmp_ssse3 (strcmp.S:101)
> ==5447== by 0x40068C: main (strcmp.c:13)
> ==5447== Address 0x5189048 is 3 bytes after a block of size 5 alloc'd
> ==5447== at 0x4C241A7: malloc (vg_replace_malloc.c:195)
> ==5447== by 0x400635: main (strcmp.c:6)
> ==5447==
> ==5447== Invalid read of size 8
> ==5447== at 0x4F35363: __strcmp_ssse3 (strcmp.S:102)
> ==5447== by 0x40068C: main (strcmp.c:13)
> ==5447== Address 0x5189098 is 3 bytes after a block of size 5 alloc'd
> ==5447== at 0x4C241A7: malloc (vg_replace_malloc.c:195)
> ==5447== by 0x400643: main (strcmp.c:7)
> ==5447==
> ==5447== Invalid read of size 8
> ==5447== at 0x4F365CC: __strncmp_ssse3 (strcmp.S:99)
> ==5447== by 0x4006A7: main (strcmp.c:14)
> ==5447== Address 0x5189040 is 0 bytes inside a block of size 5 alloc'd
> ==5447== at 0x4C241A7: malloc (vg_replace_malloc.c:195)
> ==5447== by 0x400635: main (strcmp.c:6)
> ==5447==
> ==5447== Invalid read of size 8
> ==5447== at 0x4F365D0: __strncmp_ssse3 (strcmp.S:100)
> ==5447== by 0x4006A7: main (strcmp.c:14)
> ==5447== Address 0x5189090 is 0 bytes inside a block of size 5 alloc'd
> ==5447== at 0x4C241A7: malloc (vg_replace_malloc.c:195)
> ==5447== by 0x400643: main (strcmp.c:7)
> ==5447==
> ==5447== Invalid read of size 8
> ==5447== at 0x4F365D4: __strncmp_ssse3 (strcmp.S:101)
> ==5447== by 0x4006A7: main (strcmp.c:14)
> ==5447== Address 0x5189048 is 3 bytes after a block of size 5 alloc'd
> ==5447== at 0x4C241A7: malloc (vg_replace_malloc.c:195)
> ==5447== by 0x400635: main (strcmp.c:6)
> ==5447==
> ==5447== Invalid read of size 8
> ==5447== at 0x4F365D9: __strncmp_ssse3 (strcmp.S:102)
> ==5447== by 0x4006A7: main (strcmp.c:14)
> ==5447== Address 0x5189098 is 3 bytes after a block of size 5 alloc'd
> ==5447== at 0x4C241A7: malloc (vg_replace_malloc.c:195)
> ==5447== by 0x400643: main (strcmp.c:7)
> ==5447==
> ==5447==
> ==5447== HEAP SUMMARY:
> ==5447== in use at exit: 0 bytes in 0 blocks
> ==5447== total heap usage: 2 allocs, 2 frees, 10 bytes allocated
> ==5447==
> ==5447== All heap blocks were freed -- no leaks are possible
> ==5447==
> ==5447== For counts of detected and suppressed errors, rerun with: -v
> ==5447== Use --track-origins=yes to see where uninitialised values come from
> ==5447== ERROR SUMMARY: 12 errors from 12 contexts (suppressed: 0 from 0)
> --- END LOG ---
>
>
> It seems the ssse3 implementation operates on multiples of 8
> bytes. This makes valgrind debugging difficult due to spurious
> messages, which are hard to determine whether they can be suppressed
> as false positives, or are real problems.
>
>
>
> -- System Information:
> Debian Release: squeeze/sid
> APT prefers testing
> APT policy: (500, 'testing'), (1, 'experimental')
> Architecture: amd64 (x86_64)
>
> Kernel: Linux 2.6.32-1-amd64 (SMP w/2 CPU cores)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
>
> Versions of packages libc6 depends on:
> ii libc-bin 2.11.2-2 Embedded GNU C Library: Binaries
> ii libgcc1 1:4.4.4-6 GCC support library
>
> libc6 recommends no packages.
>
> Versions of packages libc6 suggests:
> ii debconf [debconf-2.0] 1.5.32 Debian configuration management
> sy
> ii glibc-doc 2.11.2-2 Embedded GNU C Library:
> Documentat
> ii locales 2.11.2-2 Embedded GNU C Library: National
> L
>
> -- debconf information:
> * glibc/upgrade: true
> glibc/disable-screensaver:
> glibc/restart-failed:
> * glibc/restart-services: gdm exim4 cups cron atd
>
>
>
> --
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>
--
·O· Pierre Habouzit
··O [email protected]
OOO http://www.madism.org
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