Dear contributor,

Our automatic CI has detected problems related to your patch(es). Please find some details below.

In bootstrap_build master-arm-bootstrap_ubsan, after:
  | commit gcc-16-5628-g00443885755
  | Author: Jakub Jelinek <jakub@redhat.com>
  | Date:   Wed Nov 26 15:01:11 2025 +0100
  | 
  |     Change the default C++ dialect to gnu++20
  |     
  |     On Mon, Nov 03, 2025 at 01:34:28PM -0500, Marek Polacek via Gcc wrote:
  |     > I would like us to declare that C++20 is no longer experimental and
  |     > change the default dialect to gnu++20.  Last time we changed the default
  | ... 75 lines of the commit log omitted.

Produces Failure:
  | Results changed to
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe bootstrap_ubsan:
  | # FAILED
  | # First few build errors in logs:
  | # 01:24:43 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:40:67: runtime error: reference binding to misaligned address 0x05898c71 for type '<unknown>', which requires 2 byte alignment
  | # 01:24:43 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:41:71: runtime error: reference binding to misaligned address 0x05899655 for type '<unknown>', which requires 2 byte alignment
  | # 01:24:43 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:42:71: runtime error: reference binding to misaligned address 0x05899355 for type '<unknown>', which requires 2 byte alignment
  | # 01:24:43 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:43:75: runtime error: reference binding to misaligned address 0x05899055 for type '<unknown>', which requires 2 byte alignment
  | # 01:24:43 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:44:79: runtime error: reference binding to misaligned address 0x05898d55 for type '<unknown>', which requires 2 byte alignment
  | # 01:26:25 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:40:67: runtime error: reference binding to misaligned address 0x05898c71 for type '<unknown>', which requires 2 byte alignment
  | # 01:26:25 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:41:71: runtime error: reference binding to misaligned address 0x05899655 for type '<unknown>', which requires 2 byte alignment
  | # 01:26:25 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:42:71: runtime error: reference binding to misaligned address 0x05899355 for type '<unknown>', which requires 2 byte alignment
  | # 01:26:25 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:43:75: runtime error: reference binding to misaligned address 0x05899055 for type '<unknown>', which requires 2 byte alignment
  | # 01:26:25 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/libcody/server.cc:44:79: runtime error: reference binding to misaligned address 0x05898d55 for type '<unknown>', which requires 2 byte alignment
  | 
  | From
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe bootstrap_ubsan:
  | 1

Used configuration :
 *CI config* tcwg_bootstrap_build master-arm-bootstrap_ubsan
 *configure and test flags:* none, autodetected on armv8l-unknown-linux-gnueabihf

We track this bug report under https://linaro.atlassian.net/browse/GNU-1762. Please let us know if you have a fix.

If you have any questions regarding this report, please ask on linaro-toolchain@lists.linaro.org mailing list.

-----------------8<--------------------------8<--------------------------8<--------------------------

The information below contains the details of the failures, and the ways to reproduce a debug environment:

You can find the failure logs in
 * https://ci.linaro.org/job/tcwg_bootstrap_build--master-arm-bootstrap_ubsan-build/986/artifact/artifacts/
The full lists of regressions and improvements as well as configure and make commands are in
 * https://ci.linaro.org/job/tcwg_bootstrap_build--master-arm-bootstrap_ubsan-build/986/artifact/artifacts/notify/

Current build   : https://ci.linaro.org/job/tcwg_bootstrap_build--master-arm-bootstrap_ubsan-build/986/artifact/artifacts
Reference build : https://ci.linaro.org/job/tcwg_bootstrap_build--master-arm-bootstrap_ubsan-build/985/artifact/artifacts

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/004438857554f47eb5491d59b067e56fdacf0e74/tcwg_bootstrap_build/master-arm-bootstrap_ubsan/reproduction_instructions.txt

Full commit : See in git+ssh://linaroci@gcc.gnu.org/git/gcc.git