GDB and io_uring

A problem reported when attaching GDB to programs that use io_uring has led to a flurry of potential solutions, and one that was merged into Linux 5.12-rc5. The problem stemmed from a change made in the 5.12 merge window to how the threads used by io_uring were created, such that they became associated with the process using io_uring. Those "I/O threads" were treated specially in the kernel, but that led to the problem with GDB (and likely other ptrace()-using programs). The solution is to treat them like other threads because it turned out that trying to make them special caused more problems than it solved.

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