From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Wed, 12 Dec 2007 12:06:52 +0000 (GMT) Received: from localhost.localdomain ([127.0.0.1]:50656 "EHLO dl5rb.ham-radio-op.net") by ftp.linux-mips.org with ESMTP id S28574378AbXLLMGu (ORCPT ); Wed, 12 Dec 2007 12:06:50 +0000 Received: from denk.linux-mips.net (denk.linux-mips.net [127.0.0.1]) by dl5rb.ham-radio-op.net (8.14.1/8.13.8) with ESMTP id lBCC6Bo1030264; Wed, 12 Dec 2007 12:06:11 GMT Received: (from ralf@localhost) by denk.linux-mips.net (8.14.1/8.14.1/Submit) id lBCC6AFH030263; Wed, 12 Dec 2007 12:06:10 GMT Date: Wed, 12 Dec 2007 12:06:10 +0000 From: Ralf Baechle To: Florian Lohoff Cc: linux-mips@linux-mips.org, David Daney Subject: Re: 2.6.24-rc2 crash in kmap_coherent Message-ID: <20071212120610.GB28868@linux-mips.org> References: <20071211221327.GB2150@paradigm.rfc822.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071211221327.GB2150@paradigm.rfc822.org> User-Agent: Mutt/1.5.17 (2007-11-01) Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 17785 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk X-list: linux-mips On Tue, Dec 11, 2007 at 11:13:27PM +0100, Florian Lohoff wrote: > Call Trace: > [] kmap_coherent+0x10/0x130 > [] copy_from_user_page+0x40/0xb0 > [] access_process_vm+0x168/0x1d8 > [] proc_pid_cmdline+0xac/0x140 > [] proc_info_read+0x108/0x150 > [] vfs_read+0xec/0x178 > [] sys_read+0x50/0x98 > [] handle_sys+0x118/0x134 > > > Code: 0002127a 00021000 30420001 <00028036> 8f820024 3c038843 24420001 af820024 dc62f390 Hmm... This suggests that 283abbaef425c1bf817ecbb456c413cab08b1434 is not quite right. It is making the assumption that a mapped page never has PG_dcache_dirty set. Ralf