Gin Gonic 網路伺服器記憶體洩漏？-Golang-PHP中文網

Gin Gonic 网络服务器内存泄漏？

php小編百草在使用Gin Gonic網路伺服器時發現可能有記憶體洩漏的問題。記憶體洩漏是一種常見的bug，會導致程式佔用過多的記憶體資源，最終影響系統的穩定性和效能。對於開發者來說，及時發現和解決記憶體洩漏問題至關重要。在本文中，我們將探討Gin Gonic網路伺服器記憶體洩漏的原因和解決方案，幫助開發者優化程式碼，提高系統的效能。

問題內容

描述

我在 gin-gonic/gin Web 伺服器中遇到了潛在的記憶體洩漏。我嘗試透過建立一個簡單的 /health_check 端點來複製該問題。每秒都會命中端點 /health_check。當可用 Pod 記憶體耗盡時，此問題會導致記憶體不足 (OOM) 情況。 Pod 中沒有其他容器正在運作。

我還公開了 pprof 和 prometheus 指標來了解問題，但找不到任何內容。沒有看到任何其他列出的問題報告相同的問題，因此我希望有人可以幫助我隔離該問題。

我沒有看到堆疊或堆疊記憶體有任何增加，但進程記憶體不斷增加。我可以使用 RSS 看到增加，並使用 pmap 看到相應的記憶體區塊，但我無法追蹤為什麼記憶體沒有清除或分配的記憶體用於什麼。

如何重現

有相關端點的簡單程式碼範例：

<code>package server

import (
    "fmt"
    "net/http"
    _ "net/http/pprof"

    "github.com/gin-gonic/gin"
    "github.com/prometheus/client_golang/prometheus/promhttp"
)

func setupRouter() *gin.Engine {
    router := gin.New()
    router.GET("/health_check", func(c *gin.Context) {
        c.String(http.StatusOK, "Hello World!")
    })
    router.GET("/debug/pprof", gin.WrapF(http.DefaultServeMux.ServeHTTP))
    router.GET("/debug/pprof/:pprofType", gin.WrapF(http.DefaultServeMux.ServeHTTP))
    router.GET("/metrics", func(c *gin.Context) {
        handler := promhttp.Handler()
        handler.ServeHTTP(c.Writer, c.Request)
    })

    return router
}

func Start() {
    router := setupRouter()
    err := router.Run(":8080")
    if err != nil {
        fmt.Printf("Error starting server: %v\n", err)
    }
}
</code>

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<code>package main

import (
    "example.com/health-check/server"
)

func main() {
    server.Start()
}
</code>

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建置指令：

go build -ldflags="-s -w" -race -o health-check main.go

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Pod 資源限制：

64MiB 記憶體
1 個 CPU

期望

我期望記憶體使用量保持一致。一些波動是可以接受的，但我希望記憶體使用基本上保持一致，並且不會出現記憶體不足的情況。

實際結果

由於 OOM 在大約 90 分鐘內持續增加內存，Pod 崩潰了。下圖中的每個峰值都表示 Pod 由於 OOM 而重新啟動。

協程

goroutine 8334 [running]:
runtime/pprof.writeGoroutineStacks({0x7f0e9e220b20, 0xc000506200})
    /usr/local/go/src/runtime/pprof/pprof.go:703 +0x75
runtime/pprof.writeGoroutine({0x7f0e9e220b20, 0xc000506200}, 0x2)
    /usr/local/go/src/runtime/pprof/pprof.go:692 +0x45
runtime/pprof.(*Profile).WriteTo(0x1509f00, {0x7f0e9e220b20, 0xc000506200}, 0xc?)
    /usr/local/go/src/runtime/pprof/pprof.go:329 +0x1b1
net/http/pprof.handler.ServeHTTP({0xc000051601, 0x9}, {0x7f0e5462fd18, 0xc000506200}, 0x0?)
    /usr/local/go/src/net/http/pprof/pprof.go:267 +0x58a
net/http/pprof.Index({0x7f0e5462fd18?, 0xc000506200}, 0xc000506600)
    /usr/local/go/src/net/http/pprof/pprof.go:384 +0x129
net/http.HandlerFunc.ServeHTTP(0xf53ac8, {0x7f0e5462fd18, 0xc000506200}, 0xc0000b0500?)
    /usr/local/go/src/net/http/server.go:2136 +0x48
net/http.(*ServeMux).ServeHTTP(0xc0004a3740?, {0x7f0e5462fd18, 0xc000506200}, 0xc000506600)
    /usr/local/go/src/net/http/server.go:2514 +0xbd
example.com/health-check/server.setupRouter.WrapF.func4(0xc000506200)
    /go/pkg/mod/github.com/gin-gonic/[email&#160;protected]/utils.go:42 +0x97
github.com/gin-gonic/gin.(*Context).Next(...)
    /go/pkg/mod/github.com/gin-gonic/[email&#160;protected]/context.go:174
github.com/gin-gonic/gin.(*Engine).handleHTTPRequest(0xc0001871e0, 0xc000506200)
    /go/pkg/mod/github.com/gin-gonic/[email&#160;protected]/gin.go:620 +0xb91
github.com/gin-gonic/gin.(*Engine).ServeHTTP(0xc0001871e0, {0x105b2e0?, 0xc00027e540}, 0xc000506600)
    /go/pkg/mod/github.com/gin-gonic/[email&#160;protected]/gin.go:576 +0x425
net/http.serverHandler.ServeHTTP({0xc000600db0?}, {0x105b2e0, 0xc00027e540}, 0xc000506600)
    /usr/local/go/src/net/http/server.go:2938 +0x2a2
net/http.(*conn).serve(0xc000240900, {0x105c478, 0xc0001ad5c0})
    /usr/local/go/src/net/http/server.go:2009 +0xc25
created by net/http.(*Server).Serve in goroutine 1
    /usr/local/go/src/net/http/server.go:3086 +0x80d

goroutine 1 [IO wait]:
internal/poll.runtime_pollWait(0x7f0e9ea9d410, 0x72)
    /usr/local/go/src/runtime/netpoll.go:343 +0x85
internal/poll.(*pollDesc).wait(0xc0003a62a0, 0x4ae001?, 0x0)
    /usr/local/go/src/internal/poll/fd_poll_runtime.go:84 +0xb1
internal/poll.(*pollDesc).waitRead(...)
    /usr/local/go/src/internal/poll/fd_poll_runtime.go:89
internal/poll.(*FD).Accept(0xc0003a6280)
    /usr/local/go/src/internal/poll/fd_unix.go:611 +0x405
net.(*netFD).accept(0xc0003a6280)
    /usr/local/go/src/net/fd_unix.go:172 +0x3e
net.(*TCPListener).accept(0xc00024d480)
    /usr/local/go/src/net/tcpsock_posix.go:152 +0x3e
net.(*TCPListener).Accept(0xc00024d480)
    /usr/local/go/src/net/tcpsock.go:315 +0x65
net/http.(*Server).Serve(0xc00054c000, {0x105b520, 0xc00024d480})
    /usr/local/go/src/net/http/server.go:3056 +0x57f
net/http.(*Server).ListenAndServe(0xc00054c000)
    /usr/local/go/src/net/http/server.go:2985 +0xbd
net/http.ListenAndServe(...)
    /usr/local/go/src/net/http/server.go:3239
github.com/gin-gonic/gin.(*Engine).Run(0xc0001871e0, {0xc0003bbef8, 0x1, 0x1})
    /go/pkg/mod/github.com/gin-gonic/[email&#160;protected]/gin.go:386 +0x38d
example.com/health-check/server.Start()
    /app/server/server.go:49 +0x52
main.main()
    /app/main.go:8 +0x1d

goroutine 82 [IO wait]:
internal/poll.runtime_pollWait(0x7f0e9ea9d318, 0x72)
    /usr/local/go/src/runtime/netpoll.go:343 +0x85
internal/poll.(*pollDesc).wait(0xc0002c60a0, 0xc000568000?, 0x0)
    /usr/local/go/src/internal/poll/fd_poll_runtime.go:84 +0xb1
internal/poll.(*pollDesc).waitRead(...)
    /usr/local/go/src/internal/poll/fd_poll_runtime.go:89
internal/poll.(*FD).Read(0xc0002c6080, {0xc000568000, 0x1000, 0x1000})
    /usr/local/go/src/internal/poll/fd_unix.go:164 +0x3e5
net.(*netFD).Read(0xc0002c6080, {0xc000568000, 0x1000, 0x1000})
    /usr/local/go/src/net/fd_posix.go:55 +0x4b
net.(*conn).Read(0xc000514010, {0xc000568000, 0x1000, 0x1000})
    /usr/local/go/src/net/net.go:179 +0xad
net/http.(*connReader).Read(0xc0002c4450, {0xc000568000, 0x1000, 0x1000})
    /usr/local/go/src/net/http/server.go:791 +0x2b5
bufio.(*Reader).fill(0xc000536d20)
    /usr/local/go/src/bufio/bufio.go:113 +0x29a
bufio.(*Reader).Peek(0xc000536d20, 0x4)
    /usr/local/go/src/bufio/bufio.go:151 +0xc7
net/http.(*conn).serve(0xc0002e21b0, {0x105c478, 0xc0001ad5c0})
    /usr/local/go/src/net/http/server.go:2044 +0xe7c
created by net/http.(*Server).Serve in goroutine 1
    /usr/local/go/src/net/http/server.go:3086 +0x80d

goroutine 8335 [IO wait]:
internal/poll.runtime_pollWait(0x7f0e9ea9d128, 0x72)
    /usr/local/go/src/runtime/netpoll.go:343 +0x85
internal/poll.(*pollDesc).wait(0xc0002c62a0, 0xc000600dc1?, 0x0)
    /usr/local/go/src/internal/poll/fd_poll_runtime.go:84 +0xb1
internal/poll.(*pollDesc).waitRead(...)
    /usr/local/go/src/internal/poll/fd_poll_runtime.go:89
internal/poll.(*FD).Read(0xc0002c6280, {0xc000600dc1, 0x1, 0x1})
    /usr/local/go/src/internal/poll/fd_unix.go:164 +0x3e5
net.(*netFD).Read(0xc0002c6280, {0xc000600dc1, 0x1, 0x1})
    /usr/local/go/src/net/fd_posix.go:55 +0x4b
net.(*conn).Read(0xc0000b04d0, {0xc000600dc1, 0x1, 0x1})
    /usr/local/go/src/net/net.go:179 +0xad
net/http.(*connReader).backgroundRead(0xc000600db0)
    /usr/local/go/src/net/http/server.go:683 +0x83
created by net/http.(*connReader).startBackgroundRead in goroutine 8334
    /usr/local/go/src/net/http/server.go:679 +0x246

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