1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
// Copyright 2023 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.
// Code generated by "gen.bash" from internal/trace; DO NOT EDIT.
//go:build go1.23
// Regression test for an issue found in development.
//
// The core of the issue is that if generation counters
// aren't considered as part of sequence numbers, then
// it's possible to accidentally advance without a
// GoStatus event.
//
// The situation is one in which it just so happens that
// an event on the frontier for a following generation
// has a sequence number exactly one higher than the last
// sequence number for e.g. a goroutine in the previous
// generation. The parser should wait to find a GoStatus
// event before advancing into the next generation at all.
// It turns out this situation is pretty rare; the GoStatus
// event almost always shows up first in practice. But it
// can and did happen.
package main
import (
"golang.org/x/exp/trace"
"golang.org/x/exp/trace/internal/testgen"
"golang.org/x/exp/trace/internal/tracev2"
"golang.org/x/exp/trace/internal/version"
)
func main() {
testgen.Main(version.Go122, gen)
}
func gen(t *testgen.Trace) {
g1 := t.Generation(1)
// A running goroutine blocks.
b10 := g1.Batch(trace.ThreadID(0), 0)
b10.Event("ProcStatus", trace.ProcID(0), tracev2.ProcRunning)
b10.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), tracev2.GoRunning)
b10.Event("GoStop", "whatever", testgen.NoStack)
// The running goroutine gets unblocked.
b11 := g1.Batch(trace.ThreadID(1), 0)
b11.Event("ProcStatus", trace.ProcID(1), tracev2.ProcRunning)
b11.Event("GoStart", trace.GoID(1), testgen.Seq(1))
b11.Event("GoStop", "whatever", testgen.NoStack)
g2 := t.Generation(2)
// Start running the goroutine, but later.
b21 := g2.Batch(trace.ThreadID(1), 3)
b21.Event("ProcStatus", trace.ProcID(1), tracev2.ProcRunning)
b21.Event("GoStart", trace.GoID(1), testgen.Seq(2))
// The goroutine starts running, then stops, then starts again.
b20 := g2.Batch(trace.ThreadID(0), 5)
b20.Event("ProcStatus", trace.ProcID(0), tracev2.ProcRunning)
b20.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), tracev2.GoRunnable)
b20.Event("GoStart", trace.GoID(1), testgen.Seq(1))
b20.Event("GoStop", "whatever", testgen.NoStack)
}
|
