runtime: TestMemStats fails after running tests and benchmarks for some time #22696
Description
go version devel +79dbc1cc7b Sun Nov 12 13:25:35 2017 +0000 linux/amd64
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/mvdan/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/mvdan/go/land:/home/mvdan/go"
GORACE=""
GOROOT="/home/mvdan/tip"
GOTMPDIR=""
GOTOOLDIR="/home/mvdan/tip/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build917956427=/tmp/go-build -gno-record-gcc-switches"
$ go test -bench=Mem -count 10 runtime
--- FAIL: TestMemStats (0.00s)
malloc_test.go:75: TotalAlloc = 108745353624: insanely high value (overflow?); want <= 1e+11
^Csignal: interrupt
FAIL runtime 496.137s
Note that the test succeeds fine on its own, even when it's run thousands of times.
Also note that it took my laptop over 5 minutes to reach this point. Might be reached faster on a more powerful machine.