Defensive check to avoid re-freeing export during force cleanup.

diff --git a/lustre/obdclass/genops.c b/lustre/obdclass/genops.c
index c355425..3bac4a3 100644 (file)
--- a/lustre/obdclass/genops.c
+++ b/lustre/obdclass/genops.c
@@ -625,8 +625,12 @@ int class_disconnect(struct obd_export *export, int flags)
         CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
                export->exp_handle.h_cookie);
 
         CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
                export->exp_handle.h_cookie);
 

-        class_unlink_export(export);
-        class_export_put(export);
+        if (export->exp_handle.h_cookie == 0x5a5a5a5a5a5a5a5a) {
+                CERROR("disconnecting freed export %p, ignoring\n", export);
+        } else {
+                class_unlink_export(export);
+                class_export_put(export);
+        }

         RETURN(0);
 }
 
         RETURN(0);
 }