For some trivia/background, I am working on OpenCL support (some parallel computing standard that someone mentioned wanting) in pkgsrc.
I've ported a "portable" CPU-based OpenCL implementation (parallel/pocl) to NetBSD. However, currently all reference OpenCL programs linked with -lOpenCL fail, such as this one: https://us.fixstars.com/products/opencl/book/OpenCLProgrammingBook/first-opencl-program/ The segfault is actually in hwloc, a library used by OpenCL: Program received signal SIGSEGV, Segmentation fault. 0x0000764e5660a2c8 in pthread_getaffinity_np () from /usr/lib/libpthread.so.1 (gdb) bt #0 0x0000764e5660a2c8 in pthread_getaffinity_np () from /usr/lib/libpthread.so.1 #1 0x0000764e5ec1f86e in hwloc_netbsd_get_thread_cpubind (topology=topology@entry=0x764e60060000, tid=0xffffffffffffffff, hwloc_cpuset=hwloc_cpuset@entry=0x764e60078a80, flags=flags@entry=4) at topology-netbsd.c:112 #2 0x0000764e5ec1f8d3 in hwloc_netbsd_get_thisthread_cpubind (topology=0x764e60060000, hwloc_cpuset=0x764e60078a80, flags=4) at topology-netbsd.c:133 Notice how "tid" is 0xffffffffffffffff. Attempting to set the affinity of thread "0xffffffffffffffff" obviously fails. However, this value comes from the return value of pthread_self(): static int hwloc_netbsd_get_thisthread_cpubind(hwloc_topology_t topology, hwloc_bitmap_t hwloc_cpuset, int flags) { return hwloc_netbsd_get_thread_cpubind(topology, pthread_self(), hwloc_cpuset, flags); } What's going on?
