encoding/json: cause sweep increased allocation count crash on arm64

[jing-rui]

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

$ go version
go version go1.14.0 linux/arm64

go1.14.0 is build use commit 22d28a2

Does this issue reproduce with the latest release?

Yes, we use master golang branch commit 22d28a2 without modify.

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

go env Output

$ go env
GO111MODULE=""
GOARCH="arm64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="linux"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://goproxy.cn,direct"
GOROOT="/usr/lib/golang"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/golang/pkg/tool/linux_arm64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build455143019=/tmp/go-build -gno-record-gcc-switches"

What did you do?

We write a program repeatedly unmarshal config.json file on arm64, run 10 process and wait about an hour some process will crash. When we switch to use jsoniter package, no crash occurs after running 3 days.

Reproduce program https://github.com/jing-rui/go-issue-36101

What did you expect to see?

no process crash

What did you see instead?

ref #36101

[agnivade]

Is this the same as #36101 ? I wonder why do we need a separate issue then ?

[cherrymui]

Let's discuss this in a single place. Closing this as a dup.

Also, I think this is more like a runtime issue than a json issue.