On Mon, Dec 14, 2009 at 1:16 PM, Patrick McHardy <kaber@xxxxxxxxx> wrote:
> Adam Huffman wrote:
>> On Thu, Dec 10, 2009 at 11:01 AM, Patrick McHardy <kaber@xxxxxxxxx> wrote:
>>> Eric Dumazet wrote:
>>>> Le 09/12/2009 16:11, Avi Kivity a écrit :
>>>>> On 12/09/2009 03:46 PM, Adam Huffman wrote:
>>>>>> I've been seeing lots of crashes on a new Dell Precision T7500,
>>>>>> running the KVM in Fedora 12. Finally managed to capture an Oops,
>>>>>> which is shown below (hand-transcribed):
>>>>>>
>>>>>> BUG: unable to handle kernel paging request at 0000000000200200
>>>>>> IP: [<ffffffff8139aab7>] destroy_conntrack+0x82/0x11f
>>>>>> PGD 332d0e067 PUD 33453c067 PMD 0
>>>>>> RIP: 0010:[<ffffffff8139aab7>] [<ffffffff8139aab7>]
>>>>>> destroy_conntrack+0x82/0x11f
>>>>>> RSP: 0018:ffffc90000803bf0 EFLAGS: 00010202
>>>>>> RAX: 0000000080000001 RBX: ffffffff816fb1a0 RCX: 000000000000752f
>>>>>> RDX: 0000000000200200 RSI: 0000000000000011 RDI: ffffffff816fb1a0
>>>>>> RBP: ffffc90000803c00 R08: ffff880336699438 R09: 0000000000aaa5e0
>>>>>> R10: 00000002f54189d5 R11: 0000000000000001 R12: ffffffff819a92e0
>>>>>> R13: ffffffffa029adcc R14: 0000000000000000 R15: ffff880632866c38
>>>>>> FS: 00007fdd34b17710(0000) GS:ffffc90000800000(0000)
>>>>>> knlGS:0000000000000000
>>>>>> CS: 0010 DS: 002B ES: 002B CR0: 0000000080050033
>>>>>> CR2: 0000000000200200 CR3: 00000003349c0000 CR4: 00000000000026e0
>>>>>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>>>>>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>>>>>> Process qemu-kvm (pid: 1759, threadinfo ffff88062e9e8000, task
>>>>>> ffff880634945e00)
>>>>>> Stack:
>>>>>> ffff880632866c00 ffff880634640c30 ffffc90000803c10 ffffffff813989c2
>>>>>> <0> ffffc90000803c30 ffffffff81374092 ffffc90000803c30 ffff880632866c00
>>>>>> <0> ffffc90000803c50 ffffffff81373dd3 0000000200000000 ffff880632866c00
>>>>>> Call Trace:
>>>>>> <IRQ>
>>>>>> [<ffffffff813989c2>] nf_conntrack_destroy+0x1b/0x1d
>>>>>> [<ffffffff81374092>] skb_release_head_state+0x95/0xd7
>>>>>> [<ffffffff81373dd3>] __kfree_skb+0x16/0x81
>>>>>> [<ffffffff81373ed7>] kfree_skb+0x6a/0x72
>>>>>> [<ffffffffa029adcc>] ip6_mc_input+0x220/0x230 [ipv6]
>>>>>> [<ffffffffa029a3d1>] ip6_rcv_finish+0x27/0x2b [ipv6]
>>>>>> [<ffffffffa029a763>] ipv6_rcv+0x38e/0x3e5 [ipv6]
>>>>>> [<ffffffff8137bd91>] netif_receive_skb+0x402/0x427
>>>>>> ...
>>>>>>
>>>> crash in :
>>>> 48 8b 43 08 mov 0x8(%rbx),%rax
>>>> a8 01 test $0x1,%al
>>>> 48 89 02 mov %rax,(%rdx) << HERE >> RDX=0x200200 (LIST_POISON2)
>>>> 75 04 jne 1f
>>>> 48 89 50 08 mov %rdx,0x8(%rax)
>>>> 1: 48 c7 43 10 00 02 20 movq $0x200200,0x10(%rbx)
>>>>
>>>> if (!nf_ct_is_confirmed(ct)) {
>>>> BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode));
>>>> hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); << HERE >>
>>>> }
>>>> NF_CT_STAT_INC(net, delete);
>>>
>>> I can't spot the problem. Adam, please send me your .config file.
>>>
>>>
>>
>> It's the standard Fedora .config, which is attached.
>>
>> As I stated in another message, the oops seems related to VT-d. With
>> that disabled, the machine has been stable for nearly a day now.
>
> That probably only affects the timing of some race. Please also
> send me the IPv6 ruleset used on that machine. Thanks.
>
Just to note that if I disable IPv6 completely, the machine is stable
- certainly compared with the crashes after a few minutes when IPv6 is
enabled.
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