Gin Gonic Web服务器疑似内存泄漏问题求助

问题描述 #

创建了一个简单的/health_check端点，每秒被调用一次。Pod无其他容器运行，但可用内存耗尽时触发OOM错误。已暴露pprof和Prometheus指标排查，未发现异常，也未找到同类问题报告。观察到堆内存和栈内存无增长，但进程内存（RSS、pmap可见）持续上升，无法追踪未释放内存的原因及用途。

复现方式 #

代码示例 #

server/server.go

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)
    }
}

main.go

package main

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

func main() {
    server.Start()
}

编译命令 #

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

Pod资源限制 #

• 内存：64MiB
• CPU：1核

预期结果 #

内存使用保持稳定，允许小幅波动，不会触发OOM。

实际结果 #

Pod内存持续增长，约90分钟后触发OOM崩溃重启，以下图表展示相关情况：

• Gin Server Pod重启图
• Go指标常驻内存图
• Pod重启计数器图
• 堆内存与栈内存使用图

Goroutines日志 #

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/gin@v1.9.1/utils.go:42 +0x97
github.com/gin-gonic/gin.(*Context).Next(...)
    /go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/context.go:174
github.com/gin-gonic/gin.(*Engine).handleHTTPRequest(0xc0001871e0, 0xc000506200)
    /go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/gin.go:620 +0xb91
github.com/gin-gonic/gin.(*Engine).ServeHTTP(0xc0001871e0, {0x105b2e0?, 0xc00027e540}, 0xc000506600)
    /go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/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/gin@v1.9.1/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

环境信息 #

• Go版本：go1.21.1 linux/amd64
• Docker镜像：1.21.1-bullseye
• Gin版本：github.com/gin-gonic/gin v1.9.1
• 操作系统：Debian GNU/Linux 11 (bullseye)
• 环境变量：GOGC=10;GOMEMLIMIT=64MiB（使用默认值也有相同结果）

恳请提供帮助或指导，非常感谢。

内容的提问来源于stack exchange，提问作者Rohit Chaku