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SubjectRe: [linux-next] oops in ip_route_input_noref
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On 9/16/15 5:50 AM, Richard Alpe wrote:
> On 2015-09-16 11:24, Sergey Senozhatsky wrote:
>> Hi,
>>
>> 4.3.0-rc1-next-20150916
>>
>> oops after removal of rndis usb device

Hi Sergey:

Is this with KVM or baremetal?

-----8<-----
thanks for the analysis

>> addr2line -e vmlinux -i 0xffffffff8146c0b1
>> net/ipv4/route.c:1815
>> net/ipv4/route.c:1905
>>
>>
>> which seems to be this line ip_route_input_noref()->ip_route_input_slow():
>> ...
>> 1813 rth->rt_is_input = 1;
>> 1814 if (res.table)
>> 1815 rth->rt_table_id = res.table->tb_id;
>> 1816
>> ...
>>
>>
>> added by b7503e0cdb5dbec5d201aa69d8888c14679b5ae8
>>
>> net: Add FIB table id to rtable
>>
>> Add the FIB table id to rtable to make the information available for
>> IPv4 as it is for IPv6.
>>
>>
>> -ss

Hi Richard:

> I to get an Oops in ip_route_input_noref(). It happens occasionally during bootup.
> KVM environment using virtio driver. Let me know if you need any additional info or
> if you want me to try to bisect it.
>
> Starting network...
> ...
> [ 0.877040] BUG: unable to handle kernel NULL pointer dereference at 0000000000000056
> [ 0.877597] IP: [<ffffffff8155b5e2>] ip_route_input_noref+0x1a2/0xb00

Can you send me your kernel config and qemu command line? KVM with
virtio networking is a primary test vehicle, and I did not encounter
this at all.

Thanks,
David




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