[Lldb-commits] [lldb] 7d1cc51 - [LLDB] Fix race/collision in TestGlobalModuleCache.py (#202731)

[via lldb-commits]

Author: cmtice
Date: 2026-06-09T11:46:24-07:00
New Revision: 7d1cc51305618bfe2d63603d9cec3a4a4c147a10

URL: https://github.com/llvm/llvm-project/commit/7d1cc51305618bfe2d63603d9cec3a4a4c147a10
DIFF: https://github.com/llvm/llvm-project/commit/7d1cc51305618bfe2d63603d9cec3a4a4c147a10.diff

LOG: [LLDB] Fix race/collision in TestGlobalModuleCache.py (#202731)

https://github.com/llvm/llvm-project/pull/201561 sped up the test so
much that, on very fast machines, there is now a collision. The two
different a.out files get created with the exact same timestmp, which
confuses the module caching and can result in odd test failures:

make: Leaving directory
'/build/work/8a9b9199309f6c504f12c8bdaef77b319248/google3/tmp/lldb-test-build.noindex/python_api/global_module_cache/TestGlobalModuleCache.test_TwoTargetsOneDebugger_dwarf'

Unable to load lldb extension module. Possible reasons for this include:
  1) LLDB was built with LLDB_ENABLE_PYTHON=0
2) PYTHONPATH and PYTHONHOME are not set correctly. PYTHONHOME should
refer to
the version of Python that LLDB built and linked against, and PYTHONPATH
should contain the Lib directory for the same python distro, as well as
the
     location of LLDB's site-packages folder.
3) A different version of Python than that which was built against is
exported in
     the system's PATH environment variable, causing conflicts.
4) The executable
'/build/work/8a9b9199309f6c504f12c8bdaef77b319248/google3/runfiles/google3/third_party/llvm/llvm-project/lldb/lldb'
could not be found. Please check
     that it exists and is executable.

This PR fixes that by future-dating the second a.out file.

AI-assisted by Gemini.

Added: 
    

Modified: 
    lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py

Removed: 
    


################################################################################
diff  --git a/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py b/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
index df11cbec716d6..cd76d875e67d0 100644
--- a/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
+++ b/lldb/test/API/python_api/global_module_cache/TestGlobalModuleCache.py
@@ -99,6 +99,14 @@ def do_test(self, one_target, one_debugger):
         self.copy_to_main(two_print_path, main_c_path)
 
         self.build(dictionary={"C_SOURCES": main_c_path, "EXE": "a.out"})
+
+        # Force a 
diff erent mtime for the new binary to avoid cache collision
+        # if the build happened in the same second as the first build.
+        new_a_out = os.path.join(self.getBuildDir(), "a.out")
+        if os.path.exists(new_a_out):
+            future_time = time.time() + 2
+            os.utime(new_a_out, (future_time, future_time))
+
         error = lldb.SBError()
         if one_debugger:
             if one_target: