[ovs-dev] [ovs-discuss] kernel panic under heavy receive load

Chris Dunlop chris at onthe.net.au
Sat Feb 28 00:13:48 UTC 2015


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?

The thought just struck me: my two crashes were when all my VMs
were on the one hypervisor, i.e. there was no OVS traffic
between the hypervisors.



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