[Sheepdog] [PATCH] sheep: fix a network partition issue

[zituan at taobao.com]

From: Yibin Shen <zituan at taobao.com>

In some situation, the left node can also receive the confchg event,
which may be caused by corosync, that will lead to a network partition,
this patch fix it.

Signed-off-by: Yibin Shen <zituan at taobao.com>
---
 sheep/group.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/sheep/group.c b/sheep/group.c
index e22dabc..155247d 100644
--- a/sheep/group.c
+++ b/sheep/group.c
@@ -1467,6 +1467,10 @@ static void sd_leave_handler(struct sheepdog_node_list_entry *left,
 	struct work_leave *w = NULL;
 	int i, size;
 
+	if (!memcmp(left, &sys->this_node, sizeof(struct sheepdog_node_list_entry))) {
+		eprintf("BUG: this node can't be on the left list\n");
+		abort();
+	}
 	dprintf("leave %s\n", node_to_str(left));
 	for (i = 0; i < nr_members; i++)
 		dprintf("[%x] %s\n", i, node_to_str(members + i));
-- 
1.7.7