runtime: throw with mSpanList.Insert exception on Go1.12

[tokers]

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

$ go version
go/1.12.13

Does this issue reproduce with the latest release?

It cannot be reproduced stably. We have not yet reproduced it with the latest release.

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

go env Output

$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go@1.12/1.12.13/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go@1.12/1.12.13/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
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/3h/68msm91n7z9dvjhlxz5ms_z00000gn/T/go-build535753989=/tmp/go-build -gno-record-gcc-switches -fno-common"

uname -a Output

$ uname -a
Linux 3.10.0-1062.12.1.el7.x86_64 #1 SMP Tue Feb 4 23:02:59 UTC 2020 x86_64 x86_64

What did you do?

We just run Istio Pilot on our product environment (Virtual Machine). It runs for a long while and it's the first time we meet that scenario.

What did you expect to see?

No fatal error and process panic.

What did you see instead?

Process panic.

[andybons]

Go 1.12 is no longer supported. If you are able to provide code that reproduces this on a supported release (1.13 or 1.14) that would be helpful. Thanks.

[tokers]

The probability to reproduce it is very small, so that'd be a long time waiting :(. Anyway, we will follow up this issue and paste any useful information.

[ALTree]

We don't have a reproducer and 1.12 is no longer supported. I'm closing this issue, feel free to open a new one if you hit this on 1.15.