Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760502AbYHUS4o (ORCPT ); Thu, 21 Aug 2008 14:56:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754299AbYHUS4e (ORCPT ); Thu, 21 Aug 2008 14:56:34 -0400 Received: from extu-mxob-2.symantec.com ([216.10.194.135]:41400 "EHLO extu-mxob-2.symantec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752726AbYHUS4d (ORCPT ); Thu, 21 Aug 2008 14:56:33 -0400 Date: Thu, 21 Aug 2008 19:56:24 +0100 (BST) From: Hugh Dickins X-X-Sender: hugh@blonde.site To: Jeremy Fitzhardinge cc: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Ingo Molnar , "H. Peter Anvin" , Yinghai Lu , Jack Steiner , Alan Jenkins Subject: Re: [Bug #11313] Plugging HDMI causes "unable to handle kernel paging request" In-Reply-To: <48ADB041.9040806@goop.org> Message-ID: References: <48AB5D17.5030600@goop.org> <48AC3FA4.9080603@goop.org> <48ADB041.9040806@goop.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1980 Lines: 49 On Thu, 21 Aug 2008, Jeremy Fitzhardinge wrote: > > >>>> > Some notes as I pick through all the evidence so far: > > - the crash is specifically because there are reserved bits set in the pmd > - the pmd is b02a00043a6001a3 in both cases Yes, it's corrupt, it should be 800000013a6001a3 > - the vaddr is ffff88013a600000 in the first crash, and > ffff81013a6d1c00 in the second > corresponding to the same large-page pmd mapping of phys page 0x13a600000 > - this maps to e820 entry > BIOS-e820: 0000000100000000 - 0000000140000000 (usable) > - the corresponding boot-time mapping is > > init_memory_mapping > 0100000000 - 0140000000 page 2M > kernel direct mapping tables up to 140000000 @ b000-11000 > ^^^^^^^^^^ > addr 100000000 reusing pgd 201880 0000000000202063 > last_map_addr: 140000000 end: 140000000 > > !!! and the memory allocated for this pagetable is: > #5 [0000008000 - 000000b000] PGTABLE ==> [0000008000 - 000000b000] > #6 [000000b000 - 000000c000] PGTABLE ==> [000000b000 - 000000c000] > ^^^^^^^^^^^^^^^^^^^^^^^ > > IOW, it's mapping using b000-11000, but it has only reserved b000 - c000 > > Also, this is right in the middle of the ISA area, which seems risky. > <<<< > > Bug #11237 shows the same symptom, so I'm pretty confident they're dups now. [ Sorry, I'm replying to #11313 even though we think it's dup of #11237. ] Haven't you got that backwards? My reading is that find_early_table_space set aside b000-11000 for the worst case possible, but actually only b000-c000 was needed (because most of the tables were already there): no problem. -- 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/