os/signal: use a larger channel buffer for all signals in TestSignal
Now that the runtime can send preemption signals, it is possible that a channel that asks for all signals can see both SIGURG and SIGHUP before reading either, in which case one of the signals will be dropped. We have to use a larger buffer so that the test see the signal it expects. Fixes #35466 Change-Id: I36271eae0661c421780c72292a5bcbd443ada987 Reviewed-on: https://go-review.googlesource.com/c/go/+/206257 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Bryan C. Mills <bcmills@google.com>
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