--- src/nvidia_subr.c.orig	2015-11-09 11:14:41.000000000 +0500
+++ src/nvidia_subr.c	2016-05-20 11:23:23.950632000 +0500
@@ -489,6 +489,8 @@
     nv_stack_t *sp;
 
     sp = sc->api_sp;
+    /* /!\ CAUSE CRASH /!\ */
+    sp = NULL;
     rm_free_unused_clients(sp, nv, filep);
 
     if (--sc->refcnt == 0) {
@@ -594,6 +598,10 @@
 
     sc = nv->os_state;
     sp = sc->api_sp;
+    /* If nvidia_open_dev failed and we're called from nvidia_dev_dtor, we
+     * already released api_sp. */
+    if (sp == NULL)
+        return 0;
 
     NV_PCI_CHECK_CONFIG_SPACE(sp, nv, TRUE, TRUE, TRUE);
     rm_free_unused_clients(sp, nv, filep);