Debian Bug#1004269: Linker segfault while building src:xen

Debian Bug#1004269: Linker segfault while building src:xen

[Hans van Kranenburg]

(To both the Debian bug # and xen-devel list, reply-all is fine)
Hi Xen people,

I just filed a bug at Debian on the binutils package, because since the 
latest binutils package update (Debian 2.37.50.20220106-2), Xen (both 
4.14 and 4.16) fails to build with a segfault at the following point:

x86_64-linux-gnu-ld -mi386pep --subsystem=10 
--image-base=0xffff82d040000000 --stack=0,0 --heap=0,0 
--section-alignment=0x200000 --file-alignment=0x20 
--major-image-version=4 --minor-image-version=16 --major-os-version=2 
--minor-os-version=0 --major-subsystem-version=2 
--minor-subsystem-version=0 --no-insert-timestamp --build-id=sha1 -T 
efi.lds -N prelink.o 
/builds/xen-team/debian-xen/debian/output/source_dir/xen/common/symbols-dummy.o 
-b pe-x86-64 efi/buildid.o -o 
/builds/xen-team/debian-xen/debian/output/source_dir/xen/.xen.efi.0xffff82d040000000.0 
&& :
Segmentation fault (core dumped)

Full message and links to build logs etc are in the initial bug message, 
to be seen at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1004269

We (Debian Xen Team) are awaiting response, but I thought to also let 
you know already.

* Does the above error 'ring a bell'?
* Can you maybe also reproduce this in a development environment with 
very latest binutils?
* Maybe someone has a useful comment for the Debian binutils maintainer 
about what's happening in this step of the build?
* Any suggestions about what we can do to help figure this out?
* We'll try to help debug, but will surely appreciate upstream help if 
things get too technical. It's simply the case that I did not have to 
look into a very similar issue before, so it's new.

Thanks!
Hans

Re: Debian Bug#1004269: Linker segfault while building src:xen

[Jan Beulich]

On 23.01.2022 22:52, Hans van Kranenburg wrote:
> (To both the Debian bug # and xen-devel list, reply-all is fine)
> Hi Xen people,
> 
> I just filed a bug at Debian on the binutils package, because since the 
> latest binutils package update (Debian 2.37.50.20220106-2), Xen (both 
> 4.14 and 4.16) fails to build with a segfault at the following point:
> 
> x86_64-linux-gnu-ld -mi386pep --subsystem=10 
> --image-base=0xffff82d040000000 --stack=0,0 --heap=0,0 
> --section-alignment=0x200000 --file-alignment=0x20 
> --major-image-version=4 --minor-image-version=16 --major-os-version=2 
> --minor-os-version=0 --major-subsystem-version=2 
> --minor-subsystem-version=0 --no-insert-timestamp --build-id=sha1 -T 
> efi.lds -N prelink.o 
> /builds/xen-team/debian-xen/debian/output/source_dir/xen/common/symbols-dummy.o 
> -b pe-x86-64 efi/buildid.o -o 
> /builds/xen-team/debian-xen/debian/output/source_dir/xen/.xen.efi.0xffff82d040000000.0 
> && :
> Segmentation fault (core dumped)
> 
> Full message and links to build logs etc are in the initial bug message, 
> to be seen at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1004269
> 
> We (Debian Xen Team) are awaiting response, but I thought to also let 
> you know already.
> 
> * Does the above error 'ring a bell'?
> * Can you maybe also reproduce this in a development environment with 
> very latest binutils?

I've tried with a 1.5 weeks old snapshot I had lying about; no
"success". But your and my builds are surely quite different anyway.

> * Maybe someone has a useful comment for the Debian binutils maintainer 
> about what's happening in this step of the build?

It's xen.efi that's being linked; not sure what else to say.

> * Any suggestions about what we can do to help figure this out?

I'm pretty certain this needs debugging from the binutils side, so I
guess you will want to report it there (even more so with 2.38 around
the corner). I guess it's actually debugging ld or bisecting which
provide the best chance of figuring out what's going on.

Jan

> * We'll try to help debug, but will surely appreciate upstream help if 
> things get too technical. It's simply the case that I did not have to 
> look into a very similar issue before, so it's new.
> 
> Thanks!
> Hans
> 

Re: Debian Bug#1004269: Linker segfault while building src:xen

[Jan Beulich]

On 24.01.2022 09:40, Jan Beulich wrote:
> On 23.01.2022 22:52, Hans van Kranenburg wrote:
>> * Any suggestions about what we can do to help figure this out?
> 
> I'm pretty certain this needs debugging from the binutils side, so I
> guess you will want to report it there (even more so with 2.38 around
> the corner). I guess it's actually debugging ld or bisecting which
> provide the best chance of figuring out what's going on.

For the sake of xen-devel, this looks to have been fixed in binutils:

https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=07c9f243b3a12cc6749bc02ee7b165859979348b

Jan