math/rand: NewSource Method memory overflow #66867
Description
Go version
go version go1.19.1 darwin/amd64
Output of go env in your module/workspace:
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/xxx/Library/Caches/go-build"
GOENV="/Users/xxx/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/xxx/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/xxx/go"
GOPRIVATE=""
GOPROXY="https://goproxy.cn,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.19.1"
GCCGO="gccgo"
GOAMD64="v1"
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 x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/v2/70nz7fqs4bsf1nmqtbk8111h0000gp/T/go-What did you do?
develop
What did you see happen?
Variable rng memory is not released and continues to grow
Type: inuse_space
Time: Apr 17, 2024 at 10:32am (CST)
Entering interactive mode (type "help" for commands, "o" for options)
(pprof) top
Showing nodes accounting for 2098.23MB, 93.58% of 2242.26MB total
Dropped 130 nodes (cum <= 11.21MB)
Showing top 10 nodes out of 30
flat flat% sum% cum cum%
848.84MB 37.86% 37.86% 848.84MB 37.86% math/rand.NewSource (inline)
377.14MB 16.82% 54.68% 388.64MB 17.33% github.com/IBM/sarama.(*asyncProducer).newPartitionProducer
345.61MB 15.41% 70.09% 1221.45MB 54.47% github.com/IBM/sarama.(*asyncProducer).newTopicProducer
298.12MB 13.30% 83.38% 298.12MB 13.30% runtime.malg
56.51MB 2.52% 85.91% 61.51MB 2.74% github.com/IBM/sarama.(*brokerProducer).run
49.50MB 2.21% 88.11% 49.50MB 2.21% github.com/IBM/sarama.(*asyncProducer).newBrokerProducer
42MB 1.87% 89.99% 74.51MB 3.32% github.com/IBM/sarama.newAsyncProducer
27MB 1.20% 91.19% 76.51MB 3.41% github.com/IBM/sarama.(*asyncProducer).getBrokerProducer
27MB 1.20% 92.39% 415.64MB 18.54% github.com/IBM/sarama.(*topicProducer).dispatch
26.50MB 1.18% 93.58% 26.50MB 1.18% github.com/IBM/sarama.newTransactionManager
(pprof) list NewSource
Total: 2.19GB
ROUTINE ======================== math/rand.NewSource in /usr/local/go/src/math/rand/rand.go
848.84MB 848.84MB (flat, cum) 37.86% of Total
. . 39:
. . 40:// NewSource returns a new pseudo-random Source seeded with the given value.
. . 41:// Unlike the default Source used by top-level functions, this source is not
. . 42:// safe for concurrent use by multiple goroutines.
. . 43:func NewSource(seed int64) Source {
848.84MB 848.84MB 44: var rng rngSource
. . 45: rng.Seed(seed)
. . 46: return &rng
. . 47:}
. . 48:
. . 49:// A Rand is a source of random numbers.
(pprof)
What did you expect to see?
none