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I have been trying to follow the online tutorial for Learn C The Hard Way.

However after setting up valgrind (I followed other links that help setting up valgrind on ubuntu 12.04), when I try to debug the c executable, I find the following errors.

ayusman@ayusman-ubuntu:~/lcthw$ valgrind ./ex4
==1984== Memcheck, a memory error detector
==1984== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==1984== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==1984== Command: ./ex4

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:  A must-be-redirected function
valgrind:  whose name matches the pattern:      strlen
valgrind:  in an object with soname matching:   ld-linux-x86-64.so.2
valgrind:  was not found whilst processing
valgrind:  symbols from the object with soname: ld-linux-x86-64.so.2
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:    On Debian, Ubuntu:                 libc6-dbg
valgrind:    On SuSE, openSuSE, Fedora, RHEL:   glibc-debuginfo
valgrind:  Cannot continue -- exiting now.  Sorry.


Is there something that I can do to make valgrind finally work?

I have ubuntu 12.04 on virtual box. My laptop is a Windows 7 64 bit OS.

share|improve this question
valgrind worked fine for me out of the box, but i can't say what libraries i already had installed. valgrind is available from repo. you don't need to compile is like learn C the hard way states. installing from repo will handle the dependency issue for you –  hbdgaf Jun 8 '12 at 17:54

2 Answers 2

I got essentially the same message (except that ld-linux-x86-64.so.2 was replaced by ld-linux.so.2). I had installed Valgrind using apt-get so libc6-dbg was already included as a dependency.

I haven't fully resolved this yet, but a clue is that the error correlates with my use of -m32 when building.

So it would seem that, in my case, the problem is the lack of a 32-bit version of libc6-dbg (or some of its components), when building on a 64-bit install of Ubuntu 12.04.

Solution (for my case)

For me, the following command made things work...

sudo apt-get install libc6-dbg:i386

This is discussed at https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/881236

Note: The package libc6-dbg:i386 doesn't show up as an available option in Synaptic or via command-completion of apt-get -- but it was there anyway.

share|improve this answer
There's a good change you'll need help building first: stackoverflow.com/a/7412698/86967 –  nobar Jun 3 '13 at 19:44
this should be marked as correct; the :i386 is the key here. –  Thomas Shields Dec 7 '13 at 10:36
It was the 32-bit that did the trick! –  Cardin Dec 12 '13 at 10:08
This solved it for me.. I was seeing this error on a vagrant machine. As the other commenters said, this should be marked as correct. (libgc-dbg was already installed as a valgrind dependency, it was the i386 that did the trick) –  Ken Mar 20 '14 at 17:11
This answer correctly dealt with 32bit binaries. libc6-dbg was already hinted in valgrind's error message. –  leesei Dec 18 '14 at 3:10
up vote 9 down vote accepted

Ok, I did intsall libc6-dbg like so

sudo apt-get install libc6-dbg

and valgrind seems to work fine.

Thanks to the ubuntu forum link:


share|improve this answer
thanks, should be marked as answer –  Goaler444 Apr 17 '13 at 18:31
@Goaler444 I just did. Thanks for reminding. –  Ayusman Apr 17 '13 at 23:07
as the other answer points, doing sudo apt-get install libc6-dbg:i386 could be a solution depending on the binary to be valgrinded (64 bits vs 32 bits). –  logoff Aug 5 '14 at 8:54

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