Dear contributor,

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

In gcc_check master-aarch64, after:
  | commit gcc-16-7193-g158ad5f96954
  | Author: Patrick Palka <[email protected]>
  | Date:   Fri Jan 30 12:23:40 2026 -0500
  | 
  |     libstdc++/regex: Make DFS executor non-recursive [PR86164]
  |     
  |     This patch replaces the recursive implementation of the DFS executor
  |     with an iterative one using an explicit heap-based stack.  System
  |     stack usage of the executor is now constant with respect to input size
  | ... 42 lines of the commit log omitted.

Produces 21 regressions:
  | 
  | regressions.sum:
  | Running g++:g++.dg/modules/modules.exp ...
  | FAIL: g++.dg/modules/compile-std1.C -std=c++26  (test for warnings, line 10)
  | FAIL: g++.dg/modules/compile-std1.C -std=c++26 (test for excess errors)
  | FAIL: g++.dg/modules/compile-std1.C module-cmi <bits/stdc++.h> 
(gcm.cache/WORKSPACE/abe/builds/aarch64-unknown-linux-gnu/aarch64-unknown-linux-gnu/gcc-gcc.git~master-stage2/aarch64-unknown-linux-gnu/libstdc++-v3/include/aarch64-unknown-linux-gnu/bits/stdc++.h.gcm)
  | FAIL: g++.dg/modules/compile-std1.C module-cmi std (gcm.cache/std.gcm)
  | ... and 18 more

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

We track this bug report under https://linaro.atlassian.net/browse/GNU-1829. 
Please let us know if you have a fix.

If you have any questions regarding this report, please ask on 
[email protected] 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 *.log.1.xz files in
 * 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4666/artifact/artifacts/00-sumfiles/
The full lists of regressions and improvements as well as configure and make 
commands are in
 * 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4666/artifact/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
 * 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4666/artifact/artifacts/sumfiles/xfails.xfail

Current build   : 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4666/artifact/artifacts
Reference build : 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4665/artifact/artifacts

Instruction to reproduce the build : 
https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/158ad5f96954da5fa24d5c2a91ae92417fb62e20/tcwg_gcc_check/master-aarch64/reproduction_instructions.txt

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

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