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cmd/trace: failed to read event: expected batch event (EventBatch), got Invalid(115) #67602

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codenoid opened this issue May 23, 2024 · 2 comments
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cmd/trace: failed to read event: expected batch event (EventBatch), got Invalid(115) #67602

codenoid opened this issue May 23, 2024 · 2 comments
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compiler/runtime Issues related to the Go compiler and/or runtime.

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@codenoid
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Go version

go version go1.22.1 darwin/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/user/Library/Caches/go-build'
GOENV='/Users/user/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/user/go/pkg/mod'
GONOPROXY='github.com/xx'
GONOSUMDB='github.com/xx'
GOOS='darwin'
GOPATH='/Users/user/go'
GOPRIVATE='github.com/xx'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.22.1'
GCCGO='gccgo'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
GOMOD='/Users/user/Documents/xx/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/kk/ypk1jlt93r9cgpc_nnx75q0w0000gn/T/go-build877092516=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

I basically generate golang trace file like this below:

package main

import (
    "os"
    "runtime/trace"
)

func main() {
    trace.Start(os.Stderr) //start the trace 
    defer trace.Stop() // defer to the end
    .... //rest of the code
}

run with:

go run ./cmd/app 2> trace.out
# then ctrl+c after doing some task

the trace.out file is generated

I'm sorry I can't put trace.out file publicly

What did you see happen?

when I want to see the trace using:

go tool trace trace.out

it's print

user@users-MacBook-Pro xx % go tool trace trace.out
2024/05/23 19:46:40 Preparing trace for viewer...
failed to read event: expected batch event (EventBatch), got Invalid(115)

What did you expect to see?

view the trace
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label May 23, 2024
@nsrip-dd
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Deferred functions won't run if you stop your program with Ctrl-C. So, trace.Stop won't run and you will likely end up with an incomplete trace. #65319 is meant to address this, I think, as well as #65316 to make go tool trace handle incomplete traces better.

@codenoid
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I see, I remove the usage of ctrl+c and it's loaded fine now, thankyou

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@gopherbot @codenoid @nsrip-dd