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// Copyright 2018 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build !plan9 && !windows && !js && !wasip1 package runtime_test import ( "io" "os/exec" "syscall" "testing" "time" ) // Issue #27250. Spurious wakeups to pthread_cond_timedwait_relative_np // shouldn't cause semasleep to retry with the same timeout which would // cause indefinite spinning. func TestSpuriousWakeupsNeverHangSemasleep(t *testing.T) { if *flagQuick { t.Skip("-quick") } t.Parallel() // Waits for a program to sleep for 1s. exe, err := buildTestProg(t, "testprog") if err != nil { t.Fatal(err) } cmd := exec.Command(exe, "After1") stdout, err := cmd.StdoutPipe() if err != nil { t.Fatalf("StdoutPipe: %v", err) } beforeStart := time.Now() if err := cmd.Start(); err != nil { t.Fatalf("Failed to start command: %v", err) } waiting := false doneCh := make(chan error, 1) t.Cleanup(func() { cmd.Process.Kill() if waiting { <-doneCh } else { cmd.Wait() } }) // Wait for After1 to close its stdout so that we know the runtime's SIGIO // handler is registered. b, err := io.ReadAll(stdout) if len(b) > 0 { t.Logf("read from testprog stdout: %s", b) } if err != nil { t.Fatalf("error reading from testprog: %v", err) } // Wait for child exit. // // Note that we must do this after waiting for the write/child end of // stdout to close. Wait closes the read/parent end of stdout, so // starting this goroutine prior to io.ReadAll introduces a race // condition where ReadAll may get fs.ErrClosed if the child exits too // quickly. waiting = true go func() { doneCh <- cmd.Wait() close(doneCh) }() // Wait for an arbitrary timeout longer than one second. The subprocess itself // attempts to sleep for one second, but if the machine running the test is // heavily loaded that subprocess may not schedule very quickly even if the // bug remains fixed. (This is fine, because if the bug really is unfixed we // can keep the process hung indefinitely, as long as we signal it often // enough.) timeout := 10 * time.Second // The subprocess begins sleeping for 1s after it writes to stdout, so measure // the timeout from here (not from when we started creating the process). // That should reduce noise from process startup overhead. ready := time.Now() // With the repro running, we can continuously send to it // a signal that the runtime considers non-terminal, // such as SIGIO, to spuriously wake up // pthread_cond_timedwait_relative_np. ticker := time.NewTicker(200 * time.Millisecond) defer ticker.Stop() for { select { case now := <-ticker.C: if now.Sub(ready) > timeout { t.Error("Program failed to return on time and has to be killed, issue #27520 still exists") // Send SIGQUIT to get a goroutine dump. // Stop sending SIGIO so that the program can clean up and actually terminate. cmd.Process.Signal(syscall.SIGQUIT) return } // Send the pesky signal that toggles spinning // indefinitely if #27520 is not fixed. cmd.Process.Signal(syscall.SIGIO) case err := <-doneCh: if err != nil { t.Fatalf("The program returned but unfortunately with an error: %v", err) } if time.Since(beforeStart) < 1*time.Second { // The program was supposed to sleep for a full (monotonic) second; // it should not return before that has elapsed. t.Fatalf("The program stopped too quickly.") } return } } }