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Workaround intermittent segfault in libcudf_streaming UCX tests #24703

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Workaround intermittent segfault in libcudf_streaming UCX tests #24703

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6 changes: 6 additions & 0 deletions cpp/libcudf_streaming/tests/main/ucxx.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
#include <rapidsmpf/progress_thread.hpp>
#include <ucxx/listener.h>

#include <cstdlib>
#include <memory>

namespace {
Expand All @@ -29,6 +30,11 @@ class UCXXEnvironment : public Environment {

void SetUp() override
{
// UCX >= 1.22 exports a dmabuf for every newly seen device buffer to detect its memory flags.
// That export intermittently segfaults inside the CUDA driver while other threads allocate
// and free device memory. The tests do not use dmabuf, so disable it unless set by the user.
setenv("UCX_CUDA_COPY_DMABUF", "no", 0);

// Ensure CUDA context is created before UCX is initialized.
RAPIDSMPF_CUDA_TRY(cudaFree(nullptr));

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