Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S272121AbTHSEOh (ORCPT ); Tue, 19 Aug 2003 00:14:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S275344AbTHSEOh (ORCPT ); Tue, 19 Aug 2003 00:14:37 -0400 Received: from waste.org ([209.173.204.2]:6575 "EHLO waste.org") by vger.kernel.org with ESMTP id S272121AbTHSEOg (ORCPT ); Tue, 19 Aug 2003 00:14:36 -0400 Date: Mon, 18 Aug 2003 23:14:04 -0500 From: Matt Mackall To: Andrew Morton Cc: "Randy.Dunlap" , davej@redhat.com, linux-kernel@vger.kernel.org Subject: Re: Debug: sleeping function called from invalid context Message-ID: <20030819041404.GI16387@waste.org> References: <20030815101856.3eb1e15a.rddunlap@osdl.org> <20030815173246.GB9681@redhat.com> <20030815123053.2f81ec0a.rddunlap@osdl.org> <20030816070652.GG325@waste.org> <20030818140729.2e3b02f2.rddunlap@osdl.org> <20030819001316.GF22433@redhat.com> <20030818171545.5aa630a0.akpm@osdl.org> <32789.4.4.25.4.1061263463.squirrel@www.osdl.org> <20030818203513.393c4a48.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030818203513.393c4a48.akpm@osdl.org> User-Agent: Mutt/1.3.28i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1196 Lines: 26 On Mon, Aug 18, 2003 at 08:35:13PM -0700, Andrew Morton wrote: > "Randy.Dunlap" wrote: > > > > Debug: sleeping function called with interrupts disabled at > > include/asm/uaccess.h:473 > > OK, now my vague understanding of what's going on is that the app has > chosen to disable local interupts (via iopl()) and has taken a vm86 trap. Are you suggesting that whatever's calling sys_vm86 has disabled interrupts beforehand? I don't see why that's necessary at all. The vm86 fault handler is called via do_general_protection in any case and as such is in_interrupt() by definition. And a vm86 general protection fault can be caused by any of cli, sti, pushf, popf, intx, or iret. In fact, typical usage of vm86 mode is to setup a call to a 16-bit software interrupt handler and return via fault on the iret. I'm increasingly convinced it's actually broken. -- Matt Mackall : http://www.selenic.com : of or relating to the moon - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/