Index: sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
===================================================================
--- sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c	(wersja 200158)
+++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c	(kopia robocza)
@@ -124,10 +124,17 @@
 		cp = g_new_consumer(gp);
 		if (g_attach(cp, pp) != 0) {
 			g_wither_geom(gp, ENXIO);
+			ZFS_LOG(1, "g_attach() failed");
 			return (NULL);
 		}
 		if (g_access(cp, 1, write, 1) != 0) {
 			g_wither_geom(gp, ENXIO);
+			ZFS_LOG(1, "g_access() failed");
+			LIST_FOREACH(cp, &pp->consumers, consumers) {
+				ZFS_LOG(1, "cp=%p r%dw%de%d geom=%s class=%s",
+				    cp, cp->acr, cp->acw, cp->ace,
+				    cp->geom->name, cp->geom->class->name);
+			}
 			return (NULL);
 		}
 		ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
@@ -143,17 +150,31 @@
 			cp = g_new_consumer(gp);
 			if (g_attach(cp, pp) != 0) {
 				g_destroy_consumer(cp);
+				ZFS_LOG(1, "g_attach() failed");
 				return (NULL);
 			}
 			if (g_access(cp, 1, write, 1) != 0) {
 				g_detach(cp);
 				g_destroy_consumer(cp);
+				ZFS_LOG(1, "g_access() failed");
+				LIST_FOREACH(cp, &pp->consumers, consumers) {
+					ZFS_LOG(1, "cp=%p r%dw%de%d geom=%s class=%s",
+					    cp, cp->acr, cp->acw, cp->ace,
+					    cp->geom->name, cp->geom->class->name);
+				}
 				return (NULL);
 			}
 			ZFS_LOG(1, "Created consumer for %s.", pp->name);
 		} else {
-			if (g_access(cp, 1, cp->acw > 0 ? 0 : write, 1) != 0)
+			if (g_access(cp, 1, cp->acw > 0 ? 0 : write, 1) != 0) {
+				ZFS_LOG(1, "g_access() failed");
+				LIST_FOREACH(cp, &pp->consumers, consumers) {
+					ZFS_LOG(1, "cp=%p r%dw%de%d geom=%s class=%s",
+					    cp, cp->acr, cp->acw, cp->ace,
+					    cp->geom->name, cp->geom->class->name);
+				}
 				return (NULL);
+			}
 			ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
 		}
 	}