Claude
45161610f0
fix: thread_local reentrant guard — prevent cudaMalloc infinite recursion
...
CUB CachingDeviceAllocator::DeviceAllocate calls cudaMalloc internally
on cache miss. Without a guard, our intercepted cudaMalloc recurses
into DeviceAllocate → cudaMalloc → DeviceAllocate → segfault.
thread_local g_in_allocator flag detects reentrant calls and forwards
them directly to the real cudaMalloc/cudaFree via dlsym(RTLD_NEXT).
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