On Sat, Jan 30, 2010 at 04:12:18PM -0500, Jean-Baptiste Wons wrote:
[Adding Pierre to CC]
> Package: valgrind
> Severity: normal
>
> I tried on version 1:3.5.0-3, and it does work for me.
>
> This is my test program:
> #define _GNU_SOURCE
> #include <sys/mman.h>
> #include <stdio.h>
> #include <stdlib.h>
>
> int main()
> {
> void *someMem = malloc(10000);
> void *aligned = (void*)((long)someMem & ~4095L);
>
> ((char*)aligned)[1000] = 'H';
>
> void *remapedPtr = mremap(aligned, 4096, 1024 * 512, MREMAP_MAYMOVE);
>
> printf("%smoved : %lx -> %lx : %c\n", (remapedPtr == aligned)? "not ":
> "", aligned, remapedPtr, ((char*)remapedPtr)[1000]);
>
> ((char*)remapedPtr)[25000] = 'K';
>
> void *backToAligned = mremap(remapedPtr, 1024 * 512, 4096, MREMAP_MAYMOVE
> | MREMAP_FIXED, aligned);
> printf("%smoved back : %lx -> %lx : %c\n", (backToAligned == aligned)?
> "": "not ", remapedPtr, backToAligned, ((char*)backToAligned)[1000]);
>
> free(someMem);
> return 0;
> }
>
>
> And this is the valgrind result:
> w...@celine:~/debian-fix/valgrind-test% valgrind ./mremap
> ==11380== Memcheck, a memory error detector
> ==11380== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
> ==11380== Using Valgrind-3.5.0-Debian and LibVEX; rerun with -h for copyright
> info
> ==11380== Command: ./mremap
> ==11380==
> moved : 517a000 -> 4045000 : H
> moved back : 4045000 -> 517a000 : H
> ==11380==
> ==11380== HEAP SUMMARY:
> ==11380== in use at exit: 0 bytes in 0 blocks
> ==11380== total heap usage: 1 allocs, 1 frees, 10,000 bytes allocated
> ==11380==
> ==11380== All heap blocks were freed -- no leaks are possible
> ==11380==
> ==11380== For counts of detected and suppressed errors, rerun with: -v
> ==11380== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)
> w...@celine:~/debian-fix/valgrind-test%
>
>
> Do you have a small example that will reproduce the problem ?
>
> Regards,
> JB
>
>
> -- System Information:
> Debian Release: squeeze/sid
> APT prefers unstable
> APT policy: (500, 'unstable')
> Architecture: amd64 (x86_64)
>
> Kernel: Linux 2.6.31-1-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 valgrind depends on:
> ii libc6 2.10.2-5 Embedded GNU C Library: Shared
> lib
> ii libc6-dbg 2.10.2-5 Embedded GNU C Library: detached
> d
>
> Versions of packages valgrind recommends:
> ii gdb 7.0-1 The GNU Debugger
>
> Versions of packages valgrind suggests:
> pn alleyoop <none> (no description available)
> ii kcachegrind 4:4.3.2-1 visualisation tool for the
> Valgrin
> pn valkyrie <none> (no description available)
>
> -- no debconf information
>
>
>
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