From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932174AbVKLGjQ (ORCPT ); Sat, 12 Nov 2005 01:39:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932176AbVKLGjQ (ORCPT ); Sat, 12 Nov 2005 01:39:16 -0500 Received: from palinux.external.hp.com ([192.25.206.14]:31177 "EHLO palinux.hppa") by vger.kernel.org with ESMTP id S932174AbVKLGjP (ORCPT ); Sat, 12 Nov 2005 01:39:15 -0500 Date: Fri, 11 Nov 2005 23:39:14 -0700 From: Matthew Wilcox To: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, parisc-linux@parisc-linux.org Subject: 2.6.15-rc1 freeing a reserved page from uart_shutdown Message-ID: <20051112063914.GH1658@parisc-linux.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I'm having some trouble with 2.6.15-rc1: VFS: Mounted root (ext2 filesystem) readonly. Freeing unused kernel memory: 640k freed Bad page state at free_hot_cold_page (in process 'init', page 108a24a0) flags:0x00000400 mapping:00000000 mapcount:0 count:0 Backtrace: Backtrace: [<101481cc>] bad_page+0x70/0xc4 [<10148920>] free_hot_cold_page+0x74/0x124 [<10275e68>] uart_shutdown+0xf0/0xf8 [<102775f8>] uart_close+0xc8/0x214 [<1025c710>] release_dev+0x72c/0x734 [<1025cddc>] tty_release+0x10/0x20 [<101680f0>] __fput+0x15c/0x170 [<10166520>] filp_close+0x58/0x94 [<1010d114>] syscall_exit+0x0/0x14 This is on a parisc system, though a very similar tree boots fine on a different machine. The machine which produces this message is a K460 which uses the Mux serial driver. As far as I can tell, the only call to free_hot_cold_page() in uart_shutdown() is to free info->xmit.buf which seems to be always filled by a call to get_zeroed_page(). This problem doesn't show with 2.6.14. I can give access to this machine to anyone who wants to do some debugging. It has remote power capabilities ;-)