perf record output is not correct in arm64.

[zdyj3170101136]

Go version

go version go1.22.7 (Red Hat 1.22.7-1.0.2.al8) linux/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/root/.cache/go-build'
GOENV='/root/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/root/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/root/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/lib/golang'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='local'
GOTOOLDIR='/usr/lib/golang/pkg/tool/linux_arm64'
GOVCS=''
GOVERSION='go1.22.7 (Red Hat 1.22.7-1.0.2.al8)'
GCCGO='gccgo'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/dev/null'
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 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1690956932=/tmp/go-build -gno-record-gcc-switches

What did you do?

run benchmark:

package main

import (
        "encoding/json"
        "net/http"
        _ "net/http/pprof"
)

func main() {
        go func() {
                http.ListenAndServe(":7079", nil )
        }()
        for {
                json.Marshal([]byte("sss"))
        }
}

use perf:

perf record -a -g sleep 30s
perf report

What did you see happen?

perf report is very strange:

What did you expect to see?

the perf report should match the go pprof:

[gabyhelp]

Related Issues

• runtime/pprof: collecting mutex or block profiles add ~100ms of wall time #63078 (closed)
• runtime/pprof: shows invalid instruction addresses #70609 (closed)
• testing: Inconsistent benchmark data when  GOMAXPROCS=1 #31599
• pprof: go tool pprof cannot read the pprof file normally #66227 (closed)
• expvar: BenchmarkRealworldExpvarUsage times out on specific arm64 server #47511 (closed)
• runtime/pprof: collecting a CPU profile takes ~200ms of wall time #63043
• pprof: strange pprof heap flamegraph #56782 (closed)
• cmd/go: 'go test -json -bench' misattributes benchmark output to prior tests #27764 (closed)
• runtime/pprof: under-samples work on short-lived threads #40435 (closed)
• net/http/pprof: Negative allocation counts produced by /debug/pprof/allocs?seconds=1 #49171 (closed)

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[seankhliao]

I think this is #58835

[zdyj3170101136]

convert addr to func name :

addr2line -f -e ./testjson 0x1deb8
runtime.mallocgc
/root/testjson/go/src/runtime/malloc.go:1117

the result is same in perf and pprof and is correct.

so it is the perf record get wrong address.

[zdyj3170101136]

@seankhliao

it is the flamegraph generated by perf.

very different with go pprof.

not same problem.