rpc = NFS_SB(sb)->client_acl; if (!IS_ERR(rpc)) rpc_killall_tasks(rpc); 
nfs_umount_begin(struct super_block *sb){	struct rpc_clnt	*rpc = NFS_SB(sb)->client;	/* -EIO all pending I/O */	if (!IS_ERR(rpc))		rpc_killall_tasks(rpc);}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/b7fa0554cf1ba6d6895cd0a5b02989a26e0bc704/inode.c/buggy/fs/nfs/inode.c