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Date: Tue, 2 Apr 2024 13:59:47 -0700
From: Markus Mayer <>
To: Musl Mailing List <>
Cc: Colin Cross <>
Subject: Re: [PATCH 0/1] ldso: continue searching if wrong architecture
 is found

On Wed, 7 Feb 2024 at 10:09, Colin Cross <> wrote:
> On Tue, Feb 6, 2024 at 5:23 PM Markus Mayer <> wrote:
> > The problem:
> >
> > If LD_LIBRARY_PATH is set to a directory containing 32-bit libraries and
> > then a 64-bit binary is invoked, the shared library loader will pick up
> > the 32-bit version of a library first, because it'll look at
> > LD_LIBRARY_PATH before anything else. Mapping the 32-bit library into
> > the 64-bit process will fail. This much is expected.
> >
> > However, even though the correct library resides on the system, the
> > shared library loader never attempts to look for it. The 64-bit process
> > will fail to launch, even though there is no reason for the failure. The
> > problem only exists, because the shared library launcher doesn't look in
> > the remaining shared library directories.
> >
> > Continuing to search the system directories does seem to be the right
> > thing to do under the circumstances described here. Also, it is what
> > glibc does.
> There is a previous discussion of the same issue at

Thanks, Colin, for pointing this out. This was very helpful.

We have been able to determine that Colin's patch series from February
2023 does address our issue. If I apply Colin's patches, the shared
library loader will continue searching for a shared library match
after unsuccessfully trying to load a 32-bit library into a 64-bit
process. This behaviour is just what one would expect. Consequently,
launching a 64-bit binary no longer fails just because the shared
library loader happens to find the 32-bit version of a library it
needs first.

In light of this, does it make sense to revive Colin's series from
last year and reconsider it for inclusion? If there is anything I can
do to facilitate the process, please let me know. I can certainly help
with testing.

If Colin's series is somehow not acceptable, please let me know as
well, and I will see what I can come up with to resolve the issue.


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