From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757071Ab3KITdy (ORCPT ); Sat, 9 Nov 2013 14:33:54 -0500 Received: from b.ns.miles-group.at ([95.130.255.144]:1660 "EHLO radon.swed.at" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756302Ab3KITdu (ORCPT ); Sat, 9 Nov 2013 14:33:50 -0500 Message-ID: <527E8E19.9030802@nod.at> Date: Sat, 09 Nov 2013 20:33:45 +0100 From: Richard Weinberger User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: =?UTF-8?B?VG9yYWxmIEbDtnJzdGVy?= CC: Konstantin Khlebnikov , Linux Kernel , linux-fsdevel , "linux-mm@kvack.org" , UML devel Subject: Re: [uml-devel] fuzz tested 32 bit user mode linux image hangs in radix_tree_next_chunk() References: <526696BF.6050909@gmx.de> <5266A698.10400@gmx.de> <5266B60A.1000005@nod.at> <52715AD1.7000703@gmx.de> <527AB23D.2060305@gmx.de> <527AB51B.1020005@nod.at> <527E87EA.8080700@gmx.de> In-Reply-To: <527E87EA.8080700@gmx.de> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 09.11.2013 20:07, schrieb Toralf Förster: > On 11/06/2013 10:31 PM, Richard Weinberger wrote: >> Am 06.11.2013 22:18, schrieb Toralf Förster: >>> On 11/06/2013 05:06 PM, Konstantin Khlebnikov wrote: >>>> In this case it must stop after scanning whole tree in line: >>>> /* Overflow after ~0UL */ >>>> if (!index) >>>> return NULL; >>>> >>> >>> A fresh current example with latest git tree shows that lines 769 and 770 do alternate : >> >> Can you please ask gdb for the value of offset? >> >> Thanks, >> //richard >> > > Still trying to get those values. One attempt to do that was to replace -O2 with -O0 in the Makefile, > but that resulted into this error : > > LD kernel/built-in.o > CC mm/memory.o > In function ‘zap_pmd_range’, > inlined from ‘zap_pud_range’ at mm/memory.c:1265:8, > inlined from ‘unmap_page_range’ at mm/memory.c:1290:8: > mm/memory.c:1220:23: error: call to ‘__compiletime_assert_1220’ declared with attribute error: BUILD_BUG failed > mm/memory.c: In function ‘follow_page_mask’: > mm/memory.c:1530:18: error: call to ‘__compiletime_assert_1530’ declared with attribute error: BUILD_BUG failed > make[1]: *** [mm/memory.o] Error 1 > make: *** [mm] Error 2 > > > With -O1 it compiled at least. You cannot build Linux with -O1/O0. Try printing the value using printk... Thanks, //richard