Re: Update on the glibc segfault issue on Alpha

John Paul Adrian Glaubitz <[email protected]> Mon, 2 Jan 2023 18:37:54 +0100

Newsgroups	gmane.linux.debian.ports.alpha,gmane.linux.gentoo.alpha,gmane.comp.lib.glibc.alpha
Message-ID	<[email protected]>

Hello!

On 1/2/23 12:44, John Paul Adrian Glaubitz wrote:
> Adhemerval from glibc upstream is aware of the problem but he has not found yet a solution
> to this issue as it needs to be debugged further. I will try to bisect which particular
> introduced the regression and file a new upstream bug report.
> 
> During our discussion, Adhemerval pointed out that this change [3] might be the culprit
> but I have not been able to verify this yet.

My latest bisecting has shown this change to be the responsible change, CC'ing the author:

commit 73fc4e28b9464f0e13edc719a5372839970e7ddb (refs/bisect/bad)
Author: Florian Weimer <[email protected]>
Date:   Mon Feb 28 11:50:41 2022 +0100

     Linux: Consolidate auxiliary vector parsing (redo)
     
     And optimize it slightly.
     
     This is commit 8c8510ab2790039e58995ef3a22309582413d3ff revised.
     
     In _dl_aux_init in elf/dl-support.c, use an explicit loop
     and -fno-tree-loop-distribute-patterns to avoid memset.
     
     Reviewed-by: Szabolcs Nagy <[email protected]>

Adrian