ovs-lib: Wait for a longer time after SIGKILL.

Currently, when we stop a daemon, we first send it SIGTERM.
If SIGTERM did not work within ~5 seconds, we send a SIGKILL.
After sending SIGKILL, we wait only for 4 seconds, before giving
up.

If the system is extremely busy, there is a chance that a
process is not killed by the kernel within 4 seconds. In such
a case, when we try to start the daemon immediately, we see that
the pid inside the pid-file is valid and assume that the daemon
is still running. This leaves us in a state, where the daemon is
actually not running.

This patch increases the time waiting for the kernel to kill the
process to 60 seconds.

Bug #15404.
Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>

diff --git a/utilities/ovs-lib.in b/utilities/ovs-lib.in
index d010abf..a441c3d 100644 (file)
--- a/utilities/ovs-lib.in
+++ b/utilities/ovs-lib.in
@@ -172,7 +172,10 @@ start_daemon () {
 stop_daemon () {
     if test -e "$rundir/$1.pid"; then
         if pid=`cat "$rundir/$1.pid"`; then
-            for action in TERM .1 .25 .65 1 1 1 1 KILL 1 1 1 1 FAIL; do
+            for action in TERM .1 .25 .65 1 1 1 1 KILL 1 1 1 2 10 15 30 FAIL; do
+                if pid_exists "$pid" >/dev/null 2>&1; then :; else
+                    return 0
+                fi
                 case $action in
                     TERM)
                         action "Killing $1 ($pid)" kill $pid
@@ -185,11 +188,7 @@ stop_daemon () {
                         return 1
                         ;;
                     *)
-                        if pid_exists $pid >/dev/null 2>&1; then
-                            sleep $action
-                        else
-                            return 0
-                        fi
+                        sleep $action
                         ;;
                 esac
             done