https://bugs.llvm.org/show_bug.cgi?id=49940
Bug ID: 49940
Summary: Race condition in libomptarget
Product: OpenMP
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Runtime Library
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
The test "llvm-project/openmp/libomptarget/test/offloading/bug49334.cpp" fails
aleatory with both cuda and x86_64 plugins, most probably because of a race
condition within the device-agnostic part of libomptarget. This test is
implementing a block-based matrix multiplication that has the particularity to
create multiple asynchronous offloaded kernels (omp target nowait) that can be
executed in parallel (thus the race condition).
The issue can be reproduced by executing the test multiple times:
- For CUDA plugin
clang++ -O3 -fopenmp -fopenmp-targets=nvptx64-nvidia-cuda
./llvm-project/openmp/libomptarget/test/offloading/bug49334.cpp -o
blockmatmul-gpu
for i in {1..100}; do ./blockmatmul-gpu || break; done
- For x86 plugin
clang++ -O3 -fopenmp -fopenmp-targets=x86_64-pc-linux-gnu
./llvm-project/openmp/libomptarget/test/offloading/bug49334.cpp -o
blockmatmul-cpu
for i in {1..100}; do ./blockmatmul-cpu || break; done
The issue happens with the every recent versions of Clang (current development
version, v12.x, v11.x)
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