--- a/usr/src/uts/common/fs/zfs/zio.c	Mon Aug 09 11:56:40 2010 -0700
+++ b/usr/src/uts/common/fs/zfs/zio.c	Mon Aug 09 12:39:28 2010 -0700
@@ -2282,7 +2282,7 @@
 
 	ASSERT(P2PHASE(zio->io_offset, align) == 0);
 	ASSERT(P2PHASE(zio->io_size, align) == 0);
-	ASSERT(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa));
+	VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa));
 
 	/*
 	 * If this is a repair I/O, and there's no self-healing involved --