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runtime: give test child time to block

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The child in TestPanicSystemstack prints "x\n" and then blocks on a
lock. Receiving those bytes only indicates that the child is _about to
block_. Since we don't have a way to know when it is fully blocked,
sleep a bit to give it time to block. This makes us less likely to lose
the race and signal before the child blocks, which will fail the test as
the stack trace cannot be read from a running G.

Fixes #33626

Change-Id: I8a27b1b114bf75e1e5bcb2a7a33aa69cdbc22f40
Reviewed-on: https://go-review.googlesource.com/c/go/+/268578
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Michael Pratt 2020-11-09 16:37:05 -05:00
parent ae76f6e962
commit b63db7f724
1 changed files with 8 additions and 1 deletions
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9
src/runtime/crash_unix_test.go
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@ -232,13 +232,20 @@ func TestPanicSystemstack(t *testing.T) {
} }
defer pr.Close() defer pr.Close()
// Wait for "x\nx\n" to indicate readiness. // Wait for "x\nx\n" to indicate almost-readiness.
buf := make([]byte, 4) buf := make([]byte, 4)
_, err = io.ReadFull(pr, buf) _, err = io.ReadFull(pr, buf)
if err != nil || string(buf) != "x\nx\n" { if err != nil || string(buf) != "x\nx\n" {
t.Fatal("subprocess failed; output:\n", string(buf)) t.Fatal("subprocess failed; output:\n", string(buf))
} }
// The child blockers print "x\n" and then block on a lock. Receiving
// those bytes only indicates that the child is _about to block_. Since
// we don't have a way to know when it is fully blocked, sleep a bit to
// make us less likely to lose the race and signal before the child
// blocks.
time.Sleep(100*time.Millisecond)
// Send SIGQUIT. // Send SIGQUIT.
if err := cmd.Process.Signal(syscall.SIGQUIT); err != nil { if err := cmd.Process.Signal(syscall.SIGQUIT); err != nil {
t.Fatal("signaling subprocess: ", err) t.Fatal("signaling subprocess: ", err)