From: Jiri Slaby Subject: Re: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff Date: Mon, 21 Apr 2008 23:58:44 +0200 Message-ID: <480D0E14.1040306@gmail.com> References: <200804211812.16994.rjw@sisk.pl> <20080421.133940.52972455.davem@davemloft.net> <480D04A2.5000006@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: torvalds@linux-foundation.org, rjw@sisk.pl, linux-kernel@vger.kernel.org, mingo@elte.hu, akpm@linux-foundation.org, linux-ext4@vger.kernel.org, herbert@gondor.apana.org.au, paulmck@us.ibm.com, Zdenek Kabelac To: David Miller Return-path: Received: from fg-out-1718.google.com ([72.14.220.154]:48599 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752458AbYDUV67 (ORCPT ); Mon, 21 Apr 2008 17:58:59 -0400 Received: by fg-out-1718.google.com with SMTP id l27so1913851fgb.17 for ; Mon, 21 Apr 2008 14:58:57 -0700 (PDT) In-Reply-To: <480D04A2.5000006@gmail.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Leaving untouched. On 04/21/2008 11:18 PM, Jiri Slaby wrote: > On 04/21/2008 10:39 PM, David Miller wrote: >> From: Linus Torvalds >> Date: Mon, 21 Apr 2008 09:54:07 -0700 (PDT) >> >>> What I find interesting is that at least for me, I have the SLAB >>> bucket size for nf_conntrack_expect being 208 bytes. And the >>> *biggest* merge by far after 2.6.25 so far has been networking (and >>> conntrack in particular) >>> >>> Is that a smoking gun? Not necessarily. But it *is* intriguing. But >>> there are other possible clashes (the 192-byte bucket has several >>> different suspects, and not all of them are in networking).1 >> >> I think you might be onto something here. >> >> The "mask" member of struct nf_conntrack_expect could be reasonably >> all 1's like the value reported in the crash that begins this >> thread. >> >> Do we know the offset within the object at which this all 1's >> value is found? >> >> My rough calculations show that on 32-bit that expect->mask member is >> at offset 56 and on 64-bit it should be at offset 72. Does that >> match up to the offset of the filp or whatever bit being corrupted? > > dentry.d_name.name is 56 on 64-bit (my memcmp crashes) > dentry.d_hash.next is 24 (crashed at least 3 times here, rafael's one) > dentry.d_op is 136 (crash below) file.f_mapping is 176 (the another one from -rc8-mm2) the one at: http://www.opensubscriber.com/message/linux-kernel@vger.kernel.org/9008289.html Having slub_debug enabled, tomorrow will be results, I guess... > It's spreading :/. > > ---------- Forwarded message ---------- > From: Zdenek Kabelac > Date: 21.4.2008 11:14 > Subject: BUG: unable to handle kernel NULL pointer at d_free+0x18/0x80 > To: Kernel development list > > > Hello > > This oops appeared in my log - unsure how it is related to my DVB-T > tuner test before. > But I've also seen another weird resume with some similar crash. > > Happens with 2.6.25 - commit 48a86f548fb74928f9a466f52527e83fecdb4575 > (T61, 2GB) > > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000110 > IP: [d_free+24/128] d_free+0x18/0x80 > PGD 0 > Oops: 0000 [1] PREEMPT SMP > CPU 0 > Modules linked in: usb_storage dvb_usb_af9015 dvb_usb_dibusb_common > dib3000mc dibx000_common dvb_usb dvb_core tun nls_iso8859_2 nls_cp852 > vfat fat i915 drm ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 > xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables > x_tables bridge llc nfsd lockd nfs_acl auth_rpcgss exportfs autofs4 > sunrpc binfmt_misc dm_mirror dm_log dm_multipath dm_mod uinput > kvm_intel kvm snd_hda_intel arc4 ecb snd_seq_oss crypto_blkcipher > snd_seq_midi_event snd_seq cryptomgr snd_seq_device snd_pcm_oss > crypto_algapi iwl3945 mac80211 e1000e psmouse snd_mixer_oss rtc_cmos > evdev rtc_core thinkpad_acpi video snd_pcm mmc_block sdhci mmc_core > snd_timer iTCO_wdt iTCO_vendor_support battery backlight nvram rtc_lib > i2c_i801 i2c_core ac snd soundcore snd_page_alloc intel_agp output > serio_raw cfg80211 button uhci_hcd ohci_hcd ehci_hcd usbcore [last > unloaded: dvb_core] > Pid: 210, comm: kswapd0 Not tainted 2.6.25 #56 > RIP: 0010:[d_free+24/128] [d_free+24/128] d_free+0x18/0x80 > RSP: 0018:ffff81007ced9cf0 EFLAGS: 00010206 > RAX: 00000000000000f0 RBX: ffff8100202723d8 RCX: 0000000000000132 > RDX: 0000000000005e5d RSI: ffff81007ced4048 RDI: ffff8100202723d8 > RBP: ffff81007ced9d00 R08: 0000000000000002 R09: d37a6f4de9bd37a7 > R10: 0000000000000000 R11: 0000000000000000 R12: ffff8100202723d8 > R13: ffff81007c9329d8 R14: ffff8100202723e0 R15: 0000000000000029 > FS: 0000000000000000(0000) GS:ffffffff81486000(0000) > knlGS:0000000000000000 > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b > CR2: 0000000000000110 CR3: 0000000001001000 CR4: 00000000000026e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process kswapd0 (pid: 210, threadinfo ffff81007ced8000, task > ffff81007ced4000) > Stack: ffff8100202723d8 ffff81007b7e73d8 ffff81007ced9d20 > ffffffff810cb3eb > ffff8100202723d8 0000000000000000 ffff81007ced9d40 ffffffff810cb4d5 > ffff8100202723d8 ffff8100202723d8 ffff81007ced9d80 ffffffff810cb642 > Call Trace: > [d_kill+59/96] d_kill+0x3b/0x60 > [prune_one_dentry+197/240] prune_one_dentry+0xc5/0xf0 > [prune_dcache+322/512] prune_dcache+0x142/0x200 > [shrink_dcache_memory+65/80] shrink_dcache_memory+0x41/0x50 > [shrink_slab+274/480] shrink_slab+0x112/0x1e0 > [kswapd+1232/1552] kswapd+0x4d0/0x610 > [isolate_pages_global+0/64] ? isolate_pages_global+0x0/0x40 > [autoremove_wake_function+0/64] ? autoremove_wake_function+0x0/0x40 > [_spin_unlock_irqrestore+69/144] ? _spin_unlock_irqrestore+0x45/0x90 > [kswapd+0/1552] ? kswapd+0x0/0x610 > [kthread+73/144] kthread+0x49/0x90 > [child_rip+10/18] child_rip+0xa/0x12 > [restore_args+0/48] ? restore_args+0x0/0x30 > [kthread+0/144] ? kthread+0x0/0x90 > [child_rip+0/18] ? child_rip+0x0/0x12 > > > Code: 95 49 81 e8 ab ff 21 00 5b 41 5c c9 c3 66 0f 1f 44 00 00 55 48 > 89 e5 53 48 89 fb 48 83 ec 08 48 8b 87 b8 00 00 00 48 85 c0 74 0b <48> > 8b 40 20 48 85 c0 74 02 ff d0 48 83 7b 50 00 74 1e 48 8d bb > RIP [d_free+24/128] d_free+0x18/0x80 > RSP > CR2: 0000000000000110 > ---[ end trace ca143223eefdc828 ]---