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os/exec: in TestContextCancel, dump goroutines on failure
If this test fails, we want to know exactly what the os/exec goroutines are doing. Panicking gives us a goroutine dump, whereas t.Fatal does not. While we're here, use exponential backoff instead of a hard-coded 1ms sleep. We want to give the OS enough time to actually terminate the subprocess. For #42061 Change-Id: I3d50a71ac314853c68a935218e7f97ce18b08b5b Reviewed-on: https://go-review.googlesource.com/c/go/+/368317 Trust: Bryan C. Mills <bcmills@google.com> Run-TryBot: Bryan C. Mills <bcmills@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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