| // 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/v2; DO NOT EDIT. |
| |
| //go:build go1.21 |
| |
| // Tests a G being created from within a syscall. |
| // |
| // Specifically, it tests a scenerio wherein a C |
| // thread is calling into Go, creating a goroutine in |
| // a syscall (in the tracer's model). Because the actual |
| // m can be reused, it's possible for that m to have never |
| // had its P (in _Psyscall) stolen if the runtime doesn't |
| // model the scenario correctly. Make sure we reject such |
| // traces. |
| |
| package main |
| |
| import ( |
| "golang.org/x/exp/trace" |
| "golang.org/x/exp/trace/internal/event/go122" |
| testgen "golang.org/x/exp/trace/internal/testgen/go122" |
| ) |
| |
| func main() { |
| testgen.Main(gen) |
| } |
| |
| func gen(t *testgen.Trace) { |
| t.ExpectFailure(".*expected a proc but didn't have one.*") |
| |
| g := t.Generation(1) |
| |
| // A C thread calls into Go and acquires a P. It returns |
| // back to C, destroying the G. It then comes back to Go |
| // on the same thread and again returns to C. |
| // |
| // Note: on pthread platforms this can't happen on the |
| // same thread because the m is stashed in TLS between |
| // calls into Go, until the thread dies. This is still |
| // possible on other platforms, however. |
| b0 := g.Batch(trace.ThreadID(0), 0) |
| b0.Event("GoCreateSyscall", trace.GoID(4)) |
| b0.Event("ProcStatus", trace.ProcID(0), go122.ProcIdle) |
| b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1)) |
| b0.Event("GoSyscallEndBlocked") |
| b0.Event("GoStart", trace.GoID(4), testgen.Seq(1)) |
| b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack) |
| b0.Event("GoDestroySyscall") |
| b0.Event("GoCreateSyscall", trace.GoID(4)) |
| b0.Event("GoSyscallEnd") |
| b0.Event("GoSyscallBegin", testgen.Seq(3), testgen.NoStack) |
| b0.Event("GoDestroySyscall") |
| } |