Add a script to dump all stacks from the debug shell (#10178)

* Add a script to dump init's stacks and fd's

* Fix LF

diagnostics/dump-init-stacks.sh

@@ -0,0 +1,28 @@
+#! /bin/bash
+
+set -ue
+
+for proc in /proc/[0-9]*; do
+  pid=$(basename "$proc")
+
+  echo -e "\nProcess: $pid"
+  echo -en "cmd: "
+  cat "/proc/$pid/cmdline" || true
+  echo -e "\nstat: "
+  cat "/proc/$pid/stat" || true
+
+  for tid in $(ls "/proc/$pid/task" || true); do
+    echo -n "tid: $tid - "
+    cat "/proc/$pid/task/$tid/comm" || true
+    cat "/proc/$pid/task/$tid/stack" || true
+  done
+
+  echo "fds: "
+  ls -la "/proc/$pid/fd" || true
+done
+
+echo "hvsockets: "
+ss -lap --vsock
+
+echo "meminfo: "
+cat /proc/meminfo