Re: [linux-next] oops in ip_route_input_noref

On 2015-09-16 15:57, David Ahern wrote:

On 9/16/15 7:53 AM, Richard Alpe wrote:

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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.

Sure thing. Not sure how ppl normally provide files on netdev but I'm just going
to go ahead and paste them here :)

An attachment for the config is better than inline.

Fantastic day today, I managed to mess up two out of two copy pastes.
Sorry about that.. Here is the proper kconfig as .gz :)

Regards
Richard

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$ ps aux | grep kvm
qemu-system-x86_64 -enable-kvm -name tipc-medium-node1 -S -machine pc-0.14,accel=kvm,usb=off -m 1024 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid cdec478a-5f0d-49f1-b25e-fac4ca0b290c -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/tipc-medium-node1.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot order=n,menu=on,strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -netdev tap,fd=25,id=hostnet0 -device e1000,netdev=hostnet0,id=net0,mac=00:0f:ff:10:04:01,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 127.0.0.1:28101 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0

 x4 -msg timestamp=on

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$ cat .config
#
# Automatically generated file; DO NOT EDIT.
# Linux/x86 3.12.28 Kernel Configuration
#

3.12.28? That should say this for net-next:

# Linux/x86 4.2.0 Kernel Configuration

Or are you reporting a problem with 3.12.28?

David