[Pkg-xen-devel] Bug#1004269: Linker segfault while building src:xen

[Hans van Kranenburg]

Package: src:binutils
Version: 2.37.50.20220106-2
X-Debbugs-CC: pkg-xen-devel at lists.alioth.debian.org

Hi,

With the last binutils version src:xen starts to FTBFS.

---- >8 ---- Xen 4.16 for experimental ---- >8 ----

* Last passed build, using binutils 2.37-10.
Job overview:
  https://salsa.debian.org/xen-team/debian-xen/-/pipelines/329021
Full log:
  https://salsa.debian.org/xen-team/debian-xen/-/jobs/2290845/raw

* First failed build, using the same source code, and using binutils 
2.37.50.20220106-2:
Job overview:
  https://salsa.debian.org/xen-team/debian-xen/-/pipelines/338409
Full log:
  https://salsa.debian.org/xen-team/debian-xen/-/jobs/2375744/raw

At the end of the full log, the failure can be observed:

     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)

The above logs are for src:xen 4.16.0-1~exp1 which we were about to 
upload to experimental.

---- >8 ---- Xen 4.14 currently in unstable ---- >8 ----

I also triggered a CI run again for the current src:xen 
4.14.3+32-g9de3671772-1. The same segfault happens there, and both for 
the amd64 and i386 build test (i386 is no longer included for Xen 4.16).

Job overview:
  https://salsa.debian.org/xen-team/debian-xen/-/pipelines/340556
Full logs:
  https://salsa.debian.org/xen-team/debian-xen/-/jobs/2394079/raw
  https://salsa.debian.org/xen-team/debian-xen/-/jobs/2394080/raw

---- >8 ----

So, this is what we observe. In the Debian Xen team, there's not a great 
amount of knowledge about the exact internals of what happens here.

* At least, we can let you know there's a regression.
* Currently progress on our Xen 4.16 upload is blocked, and we also 
can't do updates of the current Xen 4.14 packages (e.g. because of 
security fixes).
* We're available to help debugging this issue if needed. We'll need 
guidance, so it will mean that we'll work based on your instructions.
* After sending this report and getting the confirmation from the BTS, 
I'll send a reply with the upstream Xen development mailing list in Cc.

Thanks in advance,
Hans van Kranenburg