[Linaro-TCWG-CI] gcc-16-5561-g283eb27d5f67: Failure on aarch64

Dear contributor,

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

In bootstrap_build master-aarch64-bootstrap_ubsan, after:
  | commit gcc-16-5561-g283eb27d5f67
  | Author: Robin Dapp <[email protected]>
  | Date:   Sun Nov 16 18:42:04 2025 +0100
  | 
  |     forwprop: Allow nop conversions for vector constructor.
  |     
  |     I observed a vect-construct forwprop opportunity in x264 that we
  |     could handle when checking for a nop conversion instead of a useless
  |     conversion.  IMHO a nop-conversion check is sufficient as we're only
  | ... 21 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:
  | # 01:48:39 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/gcc/reload1.cc:2121:1: error: not allowed type combination in ‘bit_insert_expr’
  | # 01:48:39 /home/tcwg-buildslave/workspace/tcwg_gnu_3/abe/snapshots/gcc.git~master/gcc/reload1.cc:2121:1: internal compiler error: verify_gimple failed
  | # 01:48:39 make[3]: *** [Makefile:1216: reload1.o] Error 1
  | # 01:48:39 make[2]: *** [Makefile:5723: all-stage3-gcc] Error 2
  | # 01:48:39 make[1]: *** [Makefile:27707: stage3-bubble] Error 2
  | # 01:48:39 make: *** [Makefile:1103: all] Error 2
  | 
  | From
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe bootstrap_ubsan:
  | 1

Used configuration :
 *CI config* tcwg_bootstrap_build master-aarch64-bootstrap_ubsan
 *configure and test flags:* none, autodetected on aarch64-unknown-linux-gnu

We track this bug report under https://linaro.atlassian.net/browse/GNU-1761. Please let us know if you have a fix.

If you have any questions regarding this report, please ask on [email protected] mailing list.

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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-aarch64-bootstrap_ubsan-build/991/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-aarch64-bootstrap_ubsan-build/991/artifact/artifacts/notify/

Current build   : https://ci.linaro.org/job/tcwg_bootstrap_build--master-aarch64-bootstrap_ubsan-build/991/artifact/artifacts
Reference build : https://ci.linaro.org/job/tcwg_bootstrap_build--master-aarch64-bootstrap_ubsan-build/990/artifact/artifacts

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/283eb27d5f674b6fb11d8640495993e2ec693608/tcwg_bootstrap_build/master-aarch64-bootstrap_ubsan/reproduction_instructions.txt

Full commit : See in git+ssh://[email protected]/git/gcc.git