[Bug 881236] Re: valgrind on amd64 no longer works with 32-bit binaries

Tue Oct 25 22:52:07 UTC 2011

Oh wow, sorry for the thinko, I actually typed gcc -m64 machinally
instead of -m32; indeed I can reproduce your issue with Ubuntu precise /
12.04 and -m32.

I also confirmed that the initial idea of installing libc6-dbg:i386 was
the right one, albeit it has conflicts.

After unpacking /usr/lib/debug/lib/i386-linux-gnu from
/libc6-dbg_2.13-20ubuntu5_i386.deb, valgrind passed.

So what this means is that since Ubuntu 11.10, you need to install the multiarch debugging symbols for libc on i386 before valgrind-ing 32-bits binaries on an amd64 system; theoritically this should be achieved with:
apt-get install libc6-dbg:i386

but this breaks with:
Unpacking libc6-dbg:i386 (from .../libc6-dbg_2.13-20ubuntu5_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/libc6-dbg_2.13-20ubuntu5_i386.deb (--unpack):
 './usr/lib/debug/usr/lib/pt_chown' is different from the same file on the system

due to file conflicts

I guess it means we need to break the debugging symbols into two
packages, libc-bin-dbg and libc6-dbg.

I don't think there is anything to change in valgrind as I can't think
of a way to automatically pull in valgrind's i386-debugging deps, so I'm
reassigning the bug to eglibc for the -dbg packaging changes.

Now, the -dbg packages come from Debian and should work in Ubuntu too, but Ubuntu has an additional -dbgsym repository which should have installable packages for i386 and amd64; theoritically, one should be able to add:
deb http://ddebs.ubuntu.com/ <your dist here> main restricted universe multiverse
to sources.list and then install libc6-dbgsym and libc6-dbgsym:i386; unfortunately this fails too because valgrind depends on libc6-dbg and libc6-dbg conflicts with libc6-dbgsym (on any arch); *sigh*.
  However I confirmed that forcing the installation of libc6-dbgsym:i386 solved the problem too.

This is likely going to affect Debian too as it moves to multiarch.

** Package changed: valgrind (Ubuntu) => eglibc (Ubuntu)

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https://bugs.launchpad.net/bugs/881236

Title:
  valgrind on amd64 no longer works with 32-bit binaries

Status in “eglibc” package in Ubuntu:
  New

Bug description:

  valgrind works as expected on 64-bit binaries, when using a x86-64 installation...

  [icculus at taise ~]$ cat hello.c 
  #include <stdio.h>
  int main(void) { printf("hello.\n"); return 0; }

  [icculus at taise ~]$ gcc -m64 -o hello hello.c 
  [icculus at taise ~]$ file hello
  hello: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped
  [icculus at taise ~]$ valgrind ./hello
  ==18291== Memcheck, a memory error detector
  ==18291== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
  ==18291== Using Valgrind-3.6.1-Debian and LibVEX; rerun with -h for copyright info
  ==18291== Command: ./hello
  ==18291== 
  hello.
  ==18291== 
  ==18291== HEAP SUMMARY:
  ==18291==     in use at exit: 0 bytes in 0 blocks
  ==18291==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
  ==18291== 
  ==18291== All heap blocks were freed -- no leaks are possible
  ==18291== 
  ==18291== For counts of detected and suppressed errors, rerun with: -v
  ==18291== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)

  ...however, it does not work with 32-bit binaries...

  [icculus at taise ~]$ gcc -m32 -o hello hello.c
  [icculus at taise ~]$ file hello
  hello: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped
  [icculus at taise ~]$ valgrind ./hello
  ==18492== Memcheck, a memory error detector
  ==18492== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
  ==18492== Using Valgrind-3.6.1-Debian and LibVEX; rerun with -h for copyright info
  ==18492== Command: ./hello
  ==18492== 

  valgrind:  Fatal error at startup: a function redirection
  valgrind:  which is mandatory for this platform-tool combination
  valgrind:  cannot be set up.  Details of the redirection are:
  valgrind:  
  valgrind:  A must-be-redirected function
  valgrind:  whose name matches the pattern:      index
  valgrind:  in an object with soname matching:   ld-linux.so.2
  valgrind:  was not found whilst processing
  valgrind:  symbols from the object with soname: ld-linux.so.2
  valgrind:  
  valgrind:  Possible fixes: (1, short term): install glibc's debuginfo
  valgrind:  package on this machine.  (2, longer term): ask the packagers
  valgrind:  for your Linux distribution to please in future ship a non-
  valgrind:  stripped ld.so (or whatever the dynamic linker .so is called)
  valgrind:  that exports the above-named function using the standard
  valgrind:  calling conventions for this platform.  The package you need
  valgrind:  to install for fix (1) is called
  valgrind:  
  valgrind:    On Debian, Ubuntu:                 libc6-dbg
  valgrind:    On SuSE, openSuSE, Fedora, RHEL:   glibc-debuginfo
  valgrind:  
  valgrind:  Cannot continue -- exiting now.  Sorry.

  Please note that "lib6-dbg" is installed on this system...

  [icculus at taise ~]$ sudo apt-get install libc6-dbg
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  libc6-dbg is already the newest version.
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

  This worked with 32-bit binaries in the past (perhaps as recently as 11.04, but I can't say for certain).

  This is happening on a fresh 11.04 x86-64 desktop install, default
  Ubuntu (not Kubuntu, etc). There are some non-default packages
  installed, like multilib-gcc, as you can tell by the "gcc -m32"
  command line working, but I don't think these are causing issues.

  Let me know if you need more information.

  --ryan.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: valgrind 1:3.6.1-0ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  Date: Tue Oct 25 01:13:48 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: valgrind
  UpgradeStatus: No upgrade log present (probably fresh install)

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