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Jonathan Brouwer
4f22db3e86
kernel_copy tests: properly join background threads This helps Miri because when there are threads just hanging in the background, we cannot check for memory leaks. I think even without Miri this currently leads to 100% CPU load on one core for each of these threads: once the test function returns and `sink` gets dropped, the `read` in the thread will always immediately return `0`, and then we just loop with that forever until the process exits.