fmt: unexpected fault address 0x0

[arch3754]

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

$ go version
go version go1.19.2 linux/amd64

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
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_amd64"
GOVCS=""
GOVERSION="go1.19.2"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
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 -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build275872546=/tmp/go-build -gno-record-gcc-switches"

Is there a known repair or workaround

[arch3754]

I have not been able to find a consistent repro for this, It happens about 1/100000 of the time when running the program over a large service.

[dr2chase]

This needs more information, please. What program? What service? Is cgo or unsafe code involved? Have you tried the race detector?

[arch3754]

For a service requested by a batch of rpc clients, a log is printed after each request is completed. The error is reported when the network request reports an error, not involving cgo and unsafe code

[ZekeLu]

Is it possible to run your code with the race detector enabled, as suggested by dr2chase@ ?. See https://go.dev/blog/race-detector.

[arch3754]

Is it possible to run your code with the race detector enabled, as suggested by dr2chase@ ?. See https://go.dev/blog/race-detector.

There should be no race. Each request is an independent goroutine. The log is also independent in goroutine. The error "err" is also declared independently

[arch3754]

The project returns an error in the production environment for a few days, which cannot be reproduced in the test environment at present

[ZekeLu]

Maybe the access to e.Source (line 482) is racy?

go/src/net/net.go

Lines 473 to 494 in 8190876

	func (e *OpError) Error() string {
	if e == nil {
	return "<nil>"
	}
	s := e.Op
	if e.Net != "" {
	s += " " + e.Net
	}
	if e.Source != nil {
	s += " " + e.Source.String()
	}
	if e.Addr != nil {
	if e.Source != nil {
	s += "->"
	} else {
	s += " "
	}
	s += e.Addr.String()
	}
	s += ": " + e.Err.Error()
	return s
	}

[arch3754]

This error is returned by the "conn. Write" or "DialTimeout" method of the "net" package. I'm not sure which one it is

[ianlancetaylor]

Rather than try to analyze the code by looking at it, I very strongly suggest that you try running the program with the race detector. Thanks.

[gopherbot]

Timed out in state WaitingForInfo. Closing.

(I am just a bot, though. Please speak up if this is a mistake or you have the requested information.)