net: mapErr causes panic #60029
Description
What version of Go are you using (go version)?
$ go version go version go1.20.3 linux/amd64
Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GO111MODULE="" GOARCH="amd64" GOBIN="" GOCACHE="/home/levi/.cache/go-build" GOENV="/home/levi/.config/go/env" GOEXE="" GOEXPERIMENT="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="linux" GOINSECURE="" GOMODCACHE="/home/levi/go/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="linux" GOPATH="/home/levi/go" GOPRIVATE="" GOPROXY="https://proxy.golang.org,direct" GOROOT="/usr/local/go" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64" GOVCS="" GOVERSION="go1.20.3" GCCGO="gccgo" GOAMD64="v1" AR="ar" CC="gcc" CXX="g++" CGO_ENABLED="1" GOMOD="/home/levi/Projects/git.levi.lol/gopanic/go.mod" GOWORK="" CGO_CFLAGS="-O2 -g" CGO_CPPFLAGS="" CGO_CXXFLAGS="-O2 -g" CGO_FFLAGS="-O2 -g" CGO_LDFLAGS="-O2 -g" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3232031148=/tmp/go-build -gno-record-gcc-switches"
What did you do?
We are running a service that communicates with another service. I created a repository to maybe help explain.
What did you expect to see?
No issues.
What did you see instead?
panic: runtime error: invalid memory address or nil pointer dereference
It points to the mapErr function call in lookup.go. It seems like if the mapErr function is passed a nil, then it will panic. I'm not sure if this would be a race issue or what, but it's been difficult to troubleshoot.
- The
ctx.Done()returns // Done may return nil if this context can never be canceled. - Then
ctx.Err()returns nil // If Done is not yet closed, Err returns nil. - Then
mapErrcauses a panic