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os/signal: test with a significantly longer fatal timeout

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We've observed some occasional os-arch specific timeouts
in signal.TestSignalTrace(). While the main purpose of a
short timeout is to ensure the passing tests complete
quickly, the unexpected failure path can tolerate waiting
longer (the test is not intended to test how slow or
overloaded the OS is at the time it is run).

Fixes #46736
Change-Id: Ib392fc6ce485a919612784ca88ed76c30f4898e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/329502
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
This commit is contained in:
Andrew G. Morgan 2021-06-19 09:46:52 -07:00 committed by Emmanuel Odeke
parent b73cc4b02b
commit 460900a7b5
1 changed files with 7 additions and 2 deletions
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9
src/os/signal/signal_test.go
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@ -32,6 +32,11 @@ import (
// The current value is set based on flakes observed in the Go builders.
var settleTime = 100 * time.Millisecond
// fatalWaitingTime is an absurdly long time to wait for signals to be
// delivered but, using it, we (hopefully) eliminate test flakes on the
// build servers. See #46736 for discussion.
var fatalWaitingTime = 30 * time.Second
func init() {
if testenv.Builder() == "solaris-amd64-oraclerel" {
// The solaris-amd64-oraclerel builder has been observed to time out in
@ -84,7 +89,7 @@ func waitSig1(t *testing.T, c <-chan os.Signal, sig os.Signal, all bool) {
// General user code should filter out all unexpected signals instead of just
// SIGURG, but since os/signal is tightly coupled to the runtime it seems
// appropriate to be stricter here.
for time.Since(start) < settleTime {
for time.Since(start) < fatalWaitingTime {
select {
case s := <-c:
if s == sig {
@ -97,7 +102,7 @@ func waitSig1(t *testing.T, c <-chan os.Signal, sig os.Signal, all bool) {
timer.Reset(settleTime / 10)
}
}
t.Fatalf("timeout after %v waiting for %v", settleTime, sig)
t.Fatalf("timeout after %v waiting for %v", fatalWaitingTime, sig)
}
// quiesce waits until we can be reasonably confident that all pending signals