x/mobile: "runtime/cgo: chdir" error appears in debug log on startup on iOS

[curyous]

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

1.15

Does this issue reproduce with the latest release?

Yes

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

GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/<username>/Library/Caches/go-build"
GOENV="/Users/<username>/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/<username>/dev/gowksp/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/<username>/dev/gowksp"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/<username>/dev/gowksp/src/github.com/curyous/adder/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 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/z8/x3j7np6x1cjbm_44396n2f680000gn/T/go-build960861663=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

• Made a tiny Go package with 1 function.
• Built it into a framework using gomobile
• Imported the framework and called the package within Swift code.
• Debugged the app on on iPhone.

Here is an example project that produces the error:
https://github.com/curyous/gomobile-bug

What did you expect to see?

No problems logged on startup.

What did you see instead?

In debug log:

runtime/cgo: chdir(/private/var/containers/Bundle/Application/3CB0E6B1-721E-45F6-9C38-CA0EB8D971E6/GoMobile%20Bug.app) failed

[dmitshur]

/cc @hyangah per owners.

[duyleekun]

This also happens with go1.14.5 on ios 14.1

[nathan-fiscaletti]

It looks like the responsible piece of code can be found here:

go/src/runtime/cgo/gcc_darwin_arm64.c

Line 107 in 72dec90

if (chdir(dir) != 0) {