Valgrind 3.7 + GLibc 1.14.1

Question

The latest version of Valgrind and GLibc do not play nicely together.
#include <stdio.h>
#include <locale.h>
main(){
setlocale(LC_ALL, "");
Gives a horrible output. I am trying to use Valgrind, and this is really inconvenient, it is flagging up errors on every turn. Code was compiled with straight up cc val2.c -g -o val2.
$ valgrind --leak-check=yes -v --track-origins=yes ./val2
==23068== Memcheck, a memory error detector
==23068== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==23068== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==23068== Command: ./val2
==23068==
--23068-- Valgrind options:
--23068-- --leak-check=yes
--23068-- -v
--23068-- --track-origins=yes
--23068-- Contents of /proc/version:
--23068-- Linux version 3.1.1-1-ARCH (tobias@T-POWA-LX) (gcc version 4.6.2 (GCC) ) #1 SMP PREEMPT Fri Nov 11 22:05:37 UTC 2011
--23068-- Arch and hwcaps: X86, x86-sse1-sse2
--23068-- Page sizes: currently 4096, max supported 4096
--23068-- Valgrind library directory: /usr/lib/valgrind
--23068-- Reading syms from /lib/ld-2.14.1.so (0x4000000)
--23068-- Reading syms from /home/drumm/Dropbox/Programming/C/Valgrind-DONOTCOPY/val2 (0x8048000)
--23068-- Reading syms from /usr/lib/valgrind/memcheck-x86-linux (0x38000000)
--23068-- object doesn't have a symbol table
--23068-- object doesn't have a dynamic symbol table
--23068-- Reading suppressions file: /usr/lib/valgrind/default.supp
==23068== embedded gdbserver: reading from /tmp/vgdb-pipe-from-vgdb-to-23068-by-drumm-on-???
==23068== embedded gdbserver: writing to /tmp/vgdb-pipe-to-vgdb-from-23068-by-drumm-on-???
==23068== embedded gdbserver: shared mem /tmp/vgdb-pipe-shared-mem-vgdb-23068-by-drumm-on-???
==23068==
==23068== TO CONTROL THIS PROCESS USING vgdb (which you probably
==23068== don't want to do, unless you know exactly what you're doing,
==23068== or are doing some strange experiment):
==23068== /usr/lib/valgrind/../../bin/vgdb --pid=23068 ...command...
==23068==
==23068== TO DEBUG THIS PROCESS USING GDB: start GDB like this
==23068== /path/to/gdb ./val2
==23068== and then give GDB the following command
==23068== target remote | /usr/lib/valgrind/../../bin/vgdb --pid=23068
==23068== --pid is optional if only one valgrind process is running
==23068==
--23068-- REDIR: 0x4017970 (strlen) redirected to 0x38056b04 (???)
--23068-- REDIR: 0x40177b0 (index) redirected to 0x38056adf (???)
--23068-- Reading syms from /usr/lib/valgrind/vgpreload_core-x86-linux.so (0x4023000)
--23068-- object doesn't have a symbol table
--23068-- Reading syms from /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so (0x4026000)
--23068-- object doesn't have a symbol table
--23068-- Reading syms from /lib/libc-2.14.1.so (0x4053000)
--23068-- object doesn't have a symbol table
--23068-- REDIR: 0x40c92f0 (rindex) redirected to 0x402a320 (rindex)
--23068-- REDIR: 0x40c8740 (index) redirected to 0x402a430 (index)
--23068-- REDIR: 0x40cb860 (strchrnul) redirected to 0x402cd90 (strchrnul)
--23068-- REDIR: 0x40c5090 (malloc) redirected to 0x4029fb0 (malloc)
==23068== Invalid read of size 4
==23068== at 0x40C901B: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40771E8: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x4076D33: setlocale (in /lib/libc-2.14.1.so)
==23068== by 0x8048400: main (val2.c:5)
==23068== Address 0x41d002c is 4 bytes inside a block of size 5 alloc'd
==23068== at 0x402A018: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==23068== by 0x407E42B: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40784A4: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40771E8: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x4076D33: setlocale (in /lib/libc-2.14.1.so)
==23068== by 0x8048400: main (val2.c:5)
==23068==
--23068-- REDIR: 0x40c5540 (free) redirected to 0x40291b0 (free)
==23068== Conditional jump or move depends on uninitialised value(s)
==23068== at 0x40C9043: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40771E8: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x4076D33: setlocale (in /lib/libc-2.14.1.so)
==23068== by 0x8048400: main (val2.c:5)
==23068== Uninitialised value was created by a stack allocation
==23068== at 0x4077E11: ??? (in /lib/libc-2.14.1.so)
==23068==
==23068== Conditional jump or move depends on uninitialised value(s)
==23068== at 0x40C904D: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40771E8: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x4076D33: setlocale (in /lib/libc-2.14.1.so)
==23068== by 0x8048400: main (val2.c:5)
==23068== Uninitialised value was created by a stack allocation
==23068== at 0x4077E11: ??? (in /lib/libc-2.14.1.so)
==23068==
==23068==
==23068== HEAP SUMMARY:
==23068== in use at exit: 0 bytes in 0 blocks
==23068== total heap usage: 28 allocs, 28 frees, 1,953 bytes allocated
==23068==
==23068== All heap blocks were freed -- no leaks are possible
==23068==
==23068== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 13 from 8)
==23068==
==23068== 1 errors in context 1 of 3:
==23068== Conditional jump or move depends on uninitialised value(s)
==23068== at 0x40C904D: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40771E8: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x4076D33: setlocale (in /lib/libc-2.14.1.so)
==23068== by 0x8048400: main (val2.c:5)
==23068== Uninitialised value was created by a stack allocation
==23068== at 0x4077E11: ??? (in /lib/libc-2.14.1.so)
==23068==
==23068==
==23068== 1 errors in context 2 of 3:
==23068== Conditional jump or move depends on uninitialised value(s)
==23068== at 0x40C9043: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40771E8: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x4076D33: setlocale (in /lib/libc-2.14.1.so)
==23068== by 0x8048400: main (val2.c:5)
==23068== Uninitialised value was created by a stack allocation
==23068== at 0x4077E11: ??? (in /lib/libc-2.14.1.so)
==23068==
==23068==
==23068== 1 errors in context 3 of 3:
==23068== Invalid read of size 4
==23068== at 0x40C901B: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40771E8: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x4076D33: setlocale (in /lib/libc-2.14.1.so)
==23068== by 0x8048400: main (val2.c:5)
==23068== Address 0x41d002c is 4 bytes inside a block of size 5 alloc'd
==23068== at 0x402A018: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==23068== by 0x407E42B: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40784A4: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x40771E8: ??? (in /lib/libc-2.14.1.so)
==23068== by 0x4076D33: setlocale (in /lib/libc-2.14.1.so)
==23068== by 0x8048400: main (val2.c:5)
==23068==
--23068--
--23068-- used_suppression: 13 U1004-ARM-_dl_relocate_object
==23068==
==23068== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 13 from 8)
I hope I have given enough data, I'll supply more if it's requested. I just want to know if there's any way to fix this, it has been suggested to me by someone to compile 3.6 from source. I'll try it and return with my results.

Answer 1

I have reported it to the mailing list for Valgrind. Another Arch user reported that he had no issues on a clean install of Arch.
Interestingly setting the locale with
setlocale(LC_ALL, "C");
Comes out clean with Valgrind.