Re: Bug#666391: valgrind: 64-bit valgrind can not run 32-bit binary due to missing/incorrect debug symbols
On Mon, Apr 02, 2012 at 05:37:54PM +0200, Sebastian Rasmussen wrote:
> I have problems running 32-bit binaries in my 64-bit valgrind, however
> this likely a bug related to eglibc or possibly in how valgrind
> depends on eglibc's packages. I expect that both 32-bit and 64-bit
> binaries can be run inside valgrind (or at least that there are
> packages recommended by valgrind that I install to do so).
The problem is there is not debug symbols packaged as a biarch package
in Debian, meaning that valgrind is mostly useless used with libc6-i386.
In other words there is no libc6-i386-dbg package as you note later:
> For 64-bit binaries (shown above) /lib/x86_64-linux-gnu/ld-2.13.so
> (installed by libc6) does have a .gnu_debuglink section pointing to
> the debug-version of located in /usr/lib/debug (more specifically
> /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.13.so) which is installed by
> libc6-dbg.
To behave properly, you have two roads, either ask the libc maintainer
to provide a libc6-i386-dbg package, which between us, wouldn't really
be the proper way, or more simply, use multiarch.
For that:
# dpkg --add-architecture i386
# apt-get update
# apt-get install libc6-i686:i386 libc6-dbg:i386
For *some* reason I don't really understand, the first time I ran your
testing-32 I had to specify the full path to the ld.so in this fashion:
$ valgrind /lib/i386-linux-gnu/ld-2.13.so ./testing-32
But it's now fine and runs properly when I just do:
$ valgrind ./testing-32
I've no real clue on *why* it didn't work the first time, probably some
kind of ld.so.cache or something.
I've put the glibc maintainer in the loop because it's not clear to me
why "valgrind ./testing-32" failed in the first instance, maybe he'll
have a clue, I suspect that "ldconfig" didn't do the right thing because
of the fact that I have three libc's: libc6:amd64, libc6-i686:i386 and
libc6-i386:amd64… and it probably picked the wrong ones.
Cheers,
--
·O· Pierre Habouzit
··O madcoder@debian.org
OOO http://www.madism.org
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