Thanks for the answer! Do you mean just LD_PRELOAD libasan without linking against it?

Regarding less optimized libc, do you know if Ubuntu produces such versions for their packages?

Regards

________________________________
From: Florian Weimer <fweimer@redhat.com>
Sent: Wednesday, June 14, 2023 9:24 AM
To: Roger Phillips via Libc-help <libc-help@sourceware.org>
Cc: Roger Phillips <heidegg@hotmail.com>
Subject: Re: Getting more info about a heap corruption

* Roger Phillips via Libc-help:

> Problem is that variables needed for this check like victim, bck and
> next are optimized out and thus not accessible in gdb. Only av and its
> contents are accessible. I cannot use asan binaries as it is a
> production test. Changing environment variables is possible though.

You could use LD_PRELOAD to install debugging malloc (such as the ASAN
allocator), or use LD_PRELOAD=libc.so.6 with a build of glibc (from the
same sources as the system glibc version) with reduced optimization.

I think there are also GDB scripts out there that traverse the various
heap data structures and report inconsistencies.

Thanks,
Florian