Add a regression test similar to the reproducer from #73141 to try to help catch future issues with vgetrandom and thread exit. Though the test isn't very precise, it just hammers thread exit. When the test reproduces #73141, it simply crashes with a SIGSEGV and no output or stack trace, which would be very unfortunate on a builder. https://go.dev/issue/49165 tracks collecting core dumps from builders, which would make this more tractable to debug. For #73141. Change-Id: I6a6a636c7d7b41e2729ff6ceb30fd7f979aa9978 Reviewed-on: https://go-review.googlesource.com/c/go/+/662636 Reviewed-by: Cherry Mui <cherryyz@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Michael Pratt <mpratt@google.com>
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