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misc/cgo/testsanitizers: add regression test for change 50251

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http://golang.org/cl/50251 fixed a regression under TSAN.
This change adds a minimal reproducer for the observed symptom.

Change-Id: Ib9ad01b458b7fdec14d6c2fe3c243f9c64b3dcf2
Reviewed-on: https://go-review.googlesource.com/50371
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Bryan C. Mills 2017-07-20 13:47:57 -04:00 committed by Bryan Mills
parent dc7fa5f6db
commit f5eb8712f8
2 changed files with 36 additions and 0 deletions
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1
misc/cgo/testsanitizers/test.bash
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@ -215,6 +215,7 @@ if test "$tsan" = "yes"; then
testtsan tsan7.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
testtsan tsan10.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
testtsan tsan11.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
testtsan tsan12.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
testtsanshared
fi

35
misc/cgo/testsanitizers/tsan12.go Normal file
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@ -0,0 +1,35 @@
// Copyright 2017 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.
package main
// This program hung when run under the C/C++ ThreadSanitizer. TSAN installs a
// libc interceptor that writes signal handlers to a global variable within the
// TSAN runtime instead of making a sigaction system call. A bug in
// syscall.runtime_AfterForkInChild corrupted TSAN's signal forwarding table
// during calls to (*os/exec.Cmd).Run, causing the parent process to fail to
// invoke signal handlers.
import (
"fmt"
"os"
"os/exec"
"os/signal"
"syscall"
)
import "C"
func main() {
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGUSR1)
if err := exec.Command("true").Run(); err != nil {
fmt.Fprintf(os.Stderr, "Unexpected error from `true`: %v", err)
os.Exit(1)
}
syscall.Kill(syscall.Getpid(), syscall.SIGUSR1)
<-ch
}