[clang] [clang][bytecode] Fix a crash when redeclaring extern globals (PR #164204)

Mon Oct 20 04:14:27 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `clang` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/17761

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: ExecutionEngine/JITLink/x86-64/MachO_archive_two_objects_same_name.s' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 5
rm -rf /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp && mkdir -p /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp
# executed command: rm -rf /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp
# executed command: mkdir -p /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp
# RUN: at line 6
split-file /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/ExecutionEngine/JITLink/x86-64/MachO_archive_two_objects_same_name.s /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp
# executed command: split-file /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/llvm/test/ExecutionEngine/JITLink/x86-64/MachO_archive_two_objects_same_name.s /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp
# RUN: at line 8
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-mc -triple x86_64-apple-macosx10.9 -filetype=obj    -o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir1/myobj.o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir1/myobj.s
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-mc -triple x86_64-apple-macosx10.9 -filetype=obj -o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir1/myobj.o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir1/myobj.s
# RUN: at line 10
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-ar crs /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/libmyobj1.a /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir1/myobj.o
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-ar crs /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/libmyobj1.a /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir1/myobj.o
# RUN: at line 12
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-mc -triple x86_64-apple-macosx10.9 -filetype=obj    -o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir2/myobj.o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir2/myobj.s
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-mc -triple x86_64-apple-macosx10.9 -filetype=obj -o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir2/myobj.o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir2/myobj.s
# RUN: at line 14
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-ar crs /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/libmyobj2.a /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir2/myobj.o
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-ar crs /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/libmyobj2.a /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/dir2/myobj.o
# RUN: at line 16
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-mc -triple x86_64-apple-macosx10.9 -filetype=obj    -o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/main.o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/main.s
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-mc -triple x86_64-apple-macosx10.9 -filetype=obj -o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/main.o /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/main.s
# RUN: at line 19
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-jitlink -noexec /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/main.o -lmyobj1 -lmyobj2 -L/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp
# executed command: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/llvm-jitlink -noexec /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp/main.o -lmyobj1 -lmyobj2 -L/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/test/ExecutionEngine/JITLink/x86-64/Output/MachO_archive_two_objects_same_name.s.tmp
# .---command stderr------------
# | llvm-jitlink error: Cannot allocate memory
# `-----------------------------
# error: command failed with exit status: 1

--

********************

```

</details>

https://github.com/llvm/llvm-project/pull/164204