On Friday, February 27, 2015, Chris Dunlop <ch...@onthe.net.au> wrote:

> On Fri, Feb 27, 2015 at 11:08:21AM -0800, Pravin Shelar wrote:
> > On Thu, Feb 26, 2015 at 9:13 PM, Chris Dunlop <ch...@onthe.net.au
> <javascript:;>> 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?
>

Nope...  I have only seen this between VMs. After repeated tests, it has
got worse that an iperf run would almost immediately trigger a crash.
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