From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f177.google.com (mail-ob0-f177.google.com [209.85.214.177]) by kanga.kvack.org (Postfix) with ESMTP id DC3226B0038 for ; Tue, 18 Nov 2014 19:45:26 -0500 (EST) Received: by mail-ob0-f177.google.com with SMTP id va2so3243436obc.36 for ; Tue, 18 Nov 2014 16:45:26 -0800 (PST) Received: from aserp1040.oracle.com (aserp1040.oracle.com. [141.146.126.69]) by mx.google.com with ESMTPS id s5si33774oib.69.2014.11.18.16.45.25 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 18 Nov 2014 16:45:25 -0800 (PST) Message-ID: <546BE7F2.3070009@oracle.com> Date: Tue, 18 Nov 2014 19:44:34 -0500 From: Sasha Levin MIME-Version: 1.0 Subject: Re: [PATCH v6 00/11] Kernel address sanitizer - runtime memory debugger. References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1415199241-5121-1-git-send-email-a.ryabinin@samsung.com> <546BD866.5050101@oracle.com> In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrey Ryabinin Cc: Andrey Ryabinin , Andrew Morton , Dmitry Vyukov , Konstantin Serebryany , Dmitry Chernenkov , Andrey Konovalov , Yuri Gribov , Konstantin Khlebnikov , Michal Marek , Thomas Gleixner , Ingo Molnar , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Dave Hansen , Andi Kleen , Vegard Nossum , "H. Peter Anvin" , "x86@kernel.org" , "linux-mm@kvack.org" , Randy Dunlap , Peter Zijlstra , Alexander Viro , Dave Jones , Jonathan Corbet , Joe Perches , LKML On 11/18/2014 07:09 PM, Andrey Ryabinin wrote: > Yes with CONFIG_KASAN_INLINE you will get GPF instead of kasan report. > For userspaces addresses we don't have shadow memory. In outline case > I just check address itself before checking shadow. In inline case compiler > just checks shadow, so there is no way to avoid GPF. > > To be able to print report instead of GPF, I need to treat GPFs in a special > way if inline instrumentation was enabled, but it's not done yet. I went ahead and tested it with the test module, which worked perfectly. No more complaints here... >> > I remembered that one of the biggest changes in kasan was the introduction of >> > inline instrumentation, so I went ahead to disable it and see if it helps. But >> > the only result of that was having the boot process hang pretty early: >> > >> > [...] >> > [ 0.000000] IOAPIC[0]: apic_id 21, version 17, address 0xfec00000, GSI 0-23 >> > [ 0.000000] Processors: 20 >> > [ 0.000000] smpboot: Allowing 24 CPUs, 4 hotplug CPUs >> > [ 0.000000] e820: [mem 0xd0000000-0xffffffff] available for PCI devices >> > [ 0.000000] Booting paravirtualized kernel on KVM >> > [ 0.000000] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:24 nr_cpu_ids:24 nr_node_ids:1 >> > [ 0.000000] PERCPU: Embedded 491 pages/cpu @ffff8808dce00000 s1971864 r8192 d31080 u2097152 >> > *HANG* >> > > This hang happens only with your error patch above or even without it? It happens even without the patch. Thanks, Sasha -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org