pprof: strange pprof heap flamegraph

[Cluas]

What version of Go are you using (go version)?

$ go version
go version go1.19.3 darwin/arm64

Does this issue reproduce with the latest release?

yes.

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE="on"
GOARCH="arm64"
GOBIN="/Users/cluas/go/bin"
GOCACHE="/Users/cluas/Library/Caches/go-build"
GOENV="/Users/cluas/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE="git.5th.im/*"
GOMODCACHE="/Users/cluas/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/cluas/go"
GOPRIVATE=""
GOPROXY=""
GOROOT="/opt/homebrew/Cellar/go/1.19.3/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/opt/homebrew/Cellar/go/1.19.3/libexec/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.19.3"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/gq/88dv0f_d45x_90p9s6_471g00000gn/T/go-build2351336244=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

What this service does is basically grab its own pprof info and write it to clickhouse. The heap memory flamegraph data that I download either manually or from the service itself doesn't feel very accurate. emm.. a lot of untime.doInit?

What did you expect to see?

Hierarchical heap pprof flamegraph

What did you see instead?

This is the pprof heap file.
heap.gz

[seankhliao]

Without knowing what your program does or how it's written, it's hard to tell what an in use heap profile should look like.
Here it looks pretty normal, maybe taken near startup without a lot of application code using memory, with the space eventually attributed to user code.

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