[ovs-discuss] kernel panic under heavy receive load

[Chris Dunlop]

On Fri, Feb 27, 2015 at 11:08:21AM -0800, Pravin Shelar wrote:
> On Thu, Feb 26, 2015 at 9:13 PM, Chris Dunlop <chris at onthe.net.au> wrote:
> > Hi,
> >
> > "Me too" on Simon's BUG() described below (apologies for the top post).
> > Basically:
> >
> > [ 7318.409796] kernel BUG at net/core/skbuff.c:1041!
> > ...
> > [ 7318.591562] RIP: 0010:[<ffffffff813eb634>]  [<ffffffff813eb634>] pskb_expand_head+0x234/0x270
> > ...
> > [ 7318.705710]  [<ffffffff813eb6fc>] __pskb_pull_tail+0x4c/0x330
> > [ 7318.711571]  [<ffffffff813f8ca7>] skb_checksum_help+0x147/0x1a0
> > [ 7318.717599]  [<ffffffffa07de8b0>] queue_userspace_packet+0x3f0/0x440 [openvswitch]
> >
> > I've hit this BUG() several times within hours or days of running on v3.14.27
> > and v3.14.33, whereas the box previously ran for months on v3.10.33 without an
> > issue.
> 
> Can you reproduce this bug on hypervisor to hypervisor test without any VMs?

I don't know.

Sorry, I've only seen the problem after many hours of running in
a production environment, and I don't have the spare facilities
to run the hypervisor to hypervisor testing and risk the crash.

Simon, are you able to try your test running direct hypervisor
to hypervisor?