Re: [linux-next] oops in ip_route_input_noref

[David Ahern]

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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