From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f43.google.com (mail-qg0-f43.google.com [209.85.192.43]) by kanga.kvack.org (Postfix) with ESMTP id 4E73E6B006C for ; Mon, 23 Feb 2015 19:12:48 -0500 (EST) Received: by mail-qg0-f43.google.com with SMTP id i50so27474849qgf.2 for ; Mon, 23 Feb 2015 16:12:48 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id d1si818778qag.120.2015.02.23.16.12.47 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 23 Feb 2015 16:12:47 -0800 (PST) Date: Mon, 23 Feb 2015 21:12:28 -0300 From: Marcelo Tosatti Subject: Re: copy_huge_page: unable to handle kernel NULL pointer dereference at 0000000000000008 Message-ID: <20150224001228.GA11456@amt.cnet> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Andrey Korolyov Cc: linux-mm@kvack.org, "kvm@vger.kernel.org" , wanpeng.li@linux.intel.com, jipan.yang@gmail.com On Wed, Feb 04, 2015 at 08:34:04PM +0400, Andrey Korolyov wrote: > >Hi, > > > >I've seen the problem quite a few times. Before spending more time on > >it, I'd like to have a quick check here to see if anyone ever saw the > >same problem? Hope it is a relevant question with this mail list. > > > > > >Jul 2 11:08:21 arno-3 kernel: [ 2165.078623] BUG: unable to handle > >kernel NULL pointer dereference at 0000000000000008 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.078916] IP: [] > >copy_huge_page+0x8a/0x2a0 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.079128] PGD 0 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.079198] Oops: 0000 [#1] SMP > >Jul 2 11:08:21 arno-3 kernel: [ 2165.079319] Modules linked in: > >ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE > >iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 > >xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp > >iptable_filter ip_tables x_tables kvm_intel kvm bridge stp llc ast ttm > >drm_kms_helper drm sysimgblt sysfillrect syscopyarea lp mei_me ioatdma > >ext2 parport mei shpchp dcdbas joydev mac_hid lpc_ich acpi_pad wmi > >hid_generic usbhid hid ixgbe igb dca i2c_algo_bit ahci ptp libahci > >mdio pps_core > >Jul 2 11:08:21 arno-3 kernel: [ 2165.081090] CPU: 19 PID: 3494 Comm: > >qemu-system-x86 Not tainted 3.11.0-15-generic #25~precise1-Ubuntu > >Jul 2 11:08:21 arno-3 kernel: [ 2165.081424] Hardware name: Dell Inc. > >PowerEdge C6220 II/09N44V, BIOS 2.0.3 07/03/2013 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.081705] task: ffff881026750000 > >ti: ffff881026056000 task.ti: ffff881026056000 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.081973] RIP: > >0010:[] [] > >copy_huge_page+0x8a/0x2a0 > > > Hello, > > sorry for possible top-posting, the same issue appears on at least > 3.10 LTS series. The original thread is at > http://marc.info/?l=kvm&m=14043742300901. Andrey, I am unable to access the URL above? > The necessary components for failure to reappear are a single running > kvm guest and mounted large thp: hugepagesz=1G (seemingly the same as > in initial report). With default 2M pages everything is working well, > the same for 3.18 with 1G THP. Are there any obvious clues for the > issue? > > Thanks! -- 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