Open
Description
What version of Go are you using (go version
)?
$ go version go version devel go1.18-9133245be7 Sat Sep 4 20:35:25 2021 +0000 darwin/arm64
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="auto" GOARCH="arm64" GOBIN="" GOCACHE="/Users/changkun/Library/Caches/go-build" GOENV="/Users/changkun/Library/Application Support/go/env" GOEXE="" GOEXPERIMENT="" GOFLAGS="" GOHOSTARCH="arm64" GOHOSTOS="darwin" GOINSECURE="" GOMODCACHE="/Users/changkun/go/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="darwin" GOPATH="/Users/changkun/go" GOPRIVATE="" GOPROXY="https://proxy.golang.org,direct" GOROOT="/Users/changkun/sdk/gotip" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/Users/changkun/sdk/gotip/pkg/tool/darwin_arm64" GOVCS="" GOVERSION="devel go1.18-9133245be7 Sat Sep 4 20:35:25 2021 +0000" GCCGO="gccgo" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="/Users/changkun/dev/changkun.de/fyne/iosrend/go.mod" 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 arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/g2/6fmr1qzx0ns3shq74zrp6bd40000gn/T/go-build130131505=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
This issue is observed in practice, see hajimehoshi/ebiten#1332, hajimehoshi/ebiten#1322, fyne-io/fyne#950.
While working on an (almost) reproducer. The problem seems to happen more often on iOS/Android and was not observed on the desktop.
A recent debugging on the rendering freeze seems to suggest gl package might block forever when using golang.org/x/mobile/app and golang.org/x/mobile/gl packages, as the rendering loop, stops processing GL calls after a while and the workAvaliable fails to receive more events.
Furthermore, according to a discussion in CL 350212, it seems #48433 might be related.
What did you expect to see?
No rendering freeze
What did you see instead?
Rendering freeze