Message-ID: <c4e36d110908140233v59421ba6y82192b858210370d@mail.gmail.com>
Date:	Fri, 14 Aug 2009 11:33:44 +0200
From:	Zdenek Kabelac <zdenek.kabelac@...il.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Robin Holt <holt@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Jesper Dangaard Brouer <hawk@...x.dk>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: System freeze on reboot - general protection fault

2009/8/13 Zdenek Kabelac <zdenek.kabelac@...il.com>:
> 2009/8/13 Christoph Lameter <cl@...ux-foundation.org>:
>> On Thu, 13 Aug 2009, Zdenek Kabelac wrote:
>>
>>> > I've added authors of some recent conntrack commits to Cc: - maybe
>>> > they might know?
>>>
>>> I've tested v2.6.30 - and it's crashing in the same way - so any other
>>> starting point where slub has the same detection mechanism and
>>> conntrack module should be working reliable ?
>>
>> Next point is 2.6.29.
>>
>
> Ok  - played lengthy game between 2.6.29 which appeared to be ok and 2.6.30
>
> And the winner is: ea781f197d6a835cbb93a0bf88ee1696296ed8aa
> netfilter: nf_conntrack: use SLAB_DESTROY_BY_RCU and get rid of call_rcu()
>
> The error is actually being hit by  libvirtd networking rules added
> during boot for my kvm usage.
> (Which I noticed after some time...  leading my game into wrong
> direction ;))....
>
> Here are the some last bisect entries:
>
> git bisect bad 54dc79fe0d895758bdaa1dcf8512d3d21263d105
> # bad: [5c0de29d06318ec8f6e3ba0d17d62529dbbdc1e8] netfilter:
> nf_conntrack: add generic function to get len of generic policy
> git bisect bad 5c0de29d06318ec8f6e3ba0d17d62529dbbdc1e8
> # good: [e487eb99cf9381a4f8254fa01747a85818da612b] netlink: add nla_policy_len()
> git bisect good e487eb99cf9381a4f8254fa01747a85818da612b
> # good: [1f9352ae2253a97b07b34dcf16ffa3b4ca12c558] netfilter:
> {ip,ip6,arp}_tables: fix incorrect loop detection
> git bisect good 1f9352ae2253a97b07b34dcf16ffa3b4ca12c558
> # bad: [2732c4e45bb67006fdc9ae6669be866762711ab5] netfilter:
> ctnetlink: allocate right-sized ctnetlink skb
> git bisect bad 2732c4e45bb67006fdc9ae6669be866762711ab5
>
>
> Unfortunately the commit cannot be reverted with current tree - thus I
> cannot easily check if it's the only problem.
> (warning: too many files (created: 3096 deleted: 1096), skipping
> inexact rename detection
> Automatic revert failed.  After resolving the conflicts,)

Hmm after checking today with serial cable attached - it looks like
I've tracked the problem but to the wrong commit - my original 'slub'
error was now actually something else - so there are most probably two
kinds of problem - as with this kernel the nf_conntrack_ipv4 fails to
register tcp so it's not loaded at all.
This might get fixed later, but different error was there.

I'll need to play the game again and check when I'll start to get the
same slub oops/

Here is the second oops I've got with 2.6.29-rc5 kernel:

IP: [<ffffffffa02b2c2c>] nf_conntrack_helper_unregister+0x16c/0x320
[nf_conntrack]
PGD 13bfb1067 PUD 1384c8067 PMD 0
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
last sysfs file: /sys/module/nf_conntrack_ftp/refcnt
CPU 0
Modules linked in: sit tunnel4 nf_defrag_ipv4 bridge stp llc autofs4
ipv6 nf_conntrack_ftp(-) nf_conntrack binfmt_misc loop dm_mirror
dm_region_hash dm_log dm_mod kvm_intel kvm i915 drm i2c_algo_bit
uinput i2c_i801 arc4 ecb cryptomgr aead crypto_blkcipher crypto_hash
crypto_algapi iwl3945 iwlcore mac80211 video thinkpad_acpi i2c_core
sr_mod rfkill led_class evdev iTCO_wdt backlight usbhid hid cfg80211
iTCO_vendor_support e1000e psmouse serio_raw cdrom output rtc_cmos
rtc_core battery intel_agp nvram rtc_lib button ac uhci_hcd ohci_hcd
ehci_hcd usbcore [last unloaded: x_tables]
Pid: 2824, comm: modprobe Not tainted 2.6.29-rc5-00889-gea781f1 #25 6464CTO
RIP: 0010:[<ffffffffa02b2c2c>]  [<ffffffffa02b2c2c>]
nf_conntrack_helper_unregister+0x16c/0x320 [nf_conntrack]
RSP: 0018:ffff88013982fe68  EFLAGS: 00010202
RAX: 0000000000000200 RBX: 0000000000000001 RCX: ffffffffa02b2b31
RDX: 00000000000001ff RSI: 8f5c28f5c28f5c29 RDI: 0000000000000001
RBP: ffff88013982feb8 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000006d R11: 0000000000000000 R12: ffffffffa02c6a00
R13: ffffffffa02c71a0 R14: ffffffff81188e20 R15: ffff88013982fe78
FS:  00007ffbd4984700(0000) GS:ffffffff8092e040(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000038 CR3: 000000013779b000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process modprobe (pid: 2824, threadinfo ffff88013982e000, task ffff880138710000)
Stack:
 ffff88013982fe88 0000020080271bf2 ffffffff806a47c0 0000000000000246
 ffff88013982fe98 ffffffffa02c6a00 0000000000000000 ffffffffa02c71a0
 0000000000000000 000000000040f510 ffff88013982fed8 ffffffffa02c502f
Call Trace:
 [<ffffffffa02c502f>] nf_conntrack_ftp_fini+0x2f/0x70 [nf_conntrack_ftp]
 [<ffffffff8027bcc5>] sys_delete_module+0x1a5/0x270
 [<ffffffff8020d329>] ? retint_swapgs+0xe/0x13
 [<ffffffff80271bf2>] ? trace_hardirqs_on_caller+0x162/0x1b0
 [<ffffffff80292121>] ? audit_syscall_entry+0x191/0x1c0
 [<ffffffff80526dae>] ? trace_hardirqs_on_thunk+0x3a/0x3f
 [<ffffffff8020c84b>] system_call_fastpath+0x16/0x1b
Code: c6 00 00 0f 82 66 ff ff ff 49 8b 9e d8 05 00 00 48 85 db 75 16
e9 8e 00 00 00 0f 1f 44 00 00 48 85 c0 0f 84 80 00 00 00 48 89 c3 <0f>
b6 4b 37 48 8b 03 48 8d 14 cd 00 00 00 00 0f 18 08 48 29 ca
RIP  [<ffffffffa02b2c2c>] nf_conntrack_helper_unregister+0x16c/0x320
[nf_conntrack]
 RSP <ffff88013982fe68>
CR2: 0000000000000038
---[ end trace bc3a0ede3d0084db ]---

Zdenek
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