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Add stack dump. #366

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Oct 28, 2017
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Add stack dump. #366

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27 changes: 27 additions & 0 deletions cmd/cri-containerd/cri_containerd.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,10 @@ import (
"flag"
"fmt"
"os"
"os/signal"
"path/filepath"
"runtime"
"syscall"

"github.com/docker/docker/pkg/reexec"
"github.com/golang/glog"
Expand Down Expand Up @@ -118,6 +121,7 @@ func main() {
cmd.AddCommand(loadImageCommand())

cmd.RunE = func(cmd *cobra.Command, args []string) error {
setupDumpStacksTrap()
if err := o.InitFlags(cmd.Flags()); err != nil {
return fmt.Errorf("failed to init CRI containerd flags: %v", err)
}
Expand Down Expand Up @@ -155,3 +159,26 @@ func validateConfig(o *options.CRIContainerdOptions) {
selinux.SetDisabled()
}
}

func setupDumpStacksTrap() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGUSR1)
go func() {
for range c {
dumpStacks()
}
}()
}

func dumpStacks() {
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@mikebrow mikebrow Oct 27, 2017 •
edited
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from: https://golang.org/src/runtime/debug/stack.go, just a little cleaner with a modification to dump all (true)

func stack() []byte {
	buf := make([]byte, 1024)
  	for {
  		n := runtime.Stack(buf, true)
  		if n < len(buf) {
  			return buf[:n]
  		}
  		buf = make([]byte, 2*len(buf))
  	}
}

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Done.

buf := make([]byte, 1024)
for {
n := runtime.Stack(buf, true)
if n < len(buf) {
buf = buf[:n]
break
}
buf = make([]byte, 2*len(buf))
}
glog.V(0).Infof("=== BEGIN goroutine stack dump ===\n%s\n=== END goroutine stack dump ===", buf)
}