| Issue |
126106
|
| Summary |
Test LlvmLibcFILETest.SimpleFileOperations fails due to file descriptor assertion
|
| Labels |
bug,
libc
|
| Assignees |
|
| Reporter |
alanzhao1
|
Repro steps:
```
$ cmake ../runtimes -GNinja \
-DLLVM_ENABLE_RUNTIMES="libc;compiler-rt" \
-DCMAKE_BUILD_TYPE=Debug \
-DCMAKE_CXX_COMPILER=clang++ \
-DCMAKE_C_COMPILER=clang \
-DLLVM_LIBC_FULL_BUILD=ON \
-DLLVM_LIBC_INCLUDE_SCUDO=ON \
-DCOMPILER_RT_BUILD_SCUDO_STANDALONE_WITH_LLVM_LIBC=ON \
-DCOMPILER_RT_BUILD_GWP_ASAN=OFF \
-DCOMPILER_RT_SCUDO_STANDALONE_BUILD_SHARED=OFF
$ ninja check-libc
```
Result:
```
[530/2361] Running unit test libc.test.src.stdio.fileop_test.__unit__
FAILED: libc/test/src/stdio/CMakeFiles/libc.test.src.stdio.fileop_test.__unit__ /usr/local/google/home/ayzhao/src/llvm-project/build-libc/libc/test/src/stdio/CMakeFiles/libc.test.src.stdio.fileop_test.__unit__
cd /usr/local/google/home/ayzhao/src/llvm-project/build-libc/libc/test/src/stdio && /usr/local/google/home/ayzhao/src/llvm-project/build-libc/libc/test/src/stdio/libc.test.src.stdio.fileop_test.__unit__.__build__
[==========] Running 3 tests from 1 test suite.
[ RUN ] LlvmLibcFILETest.SimpleFileOperations
/usr/local/google/home/ayzhao/src/llvm-project/libc/test/src/stdio/fileop_test.cpp:34: FAILURE
Expected: __llvm_libc_20_0_0_git::fileno(file)
Which is: 5
To be equal to: 3
Which is: 3
[ FAILED ] LlvmLibcFILETest.SimpleFileOperations
```
Looking at the [code](https://github.com/llvm/llvm-project/blob/16f7e961c600986de7814822fd118f431e0bb433/libc/test/src/stdio/fileop_test.cpp#L32-L34) the test opens a file and assert that its file descriptor is equal to the hardcoded value 3. This seems to be a brittle assertion as it makes assumptions about the test's process environment.
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