Re: [Xen-devel] Dom0 crash with apache bench (ab)

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Sep 14, 2015 at 02:40:08PM +0200, Christoffer Dall wrote:
> On Fri, Jul 31, 2015 at 03:17:56PM +0200, Christoffer Dall wrote:
> > On Fri, Jul 31, 2015 at 12:28 PM, David Vrabel <david.vrabel@xxxxxxxxxx>
> > wrote:
> > 
> > > On 31/07/15 11:24, Stefano Stabellini wrote:
> > > > This is a Linux Dom0 crash on x86 (Dell PowerEdge R320, Xeon E5-2450),
> > > > CC'ing relevant people. As you can see from the links below the crash
> > > > is:
> > > >
> > > > [ 253.619326] Call Trace:
> > > > [ 253.619330] <IRQ>
> > > > [ 253.619332] [<ffffffff815d7c25>] ? skb_copy_ubufs+0xa5/0x230
> > > > [ 253.619347] [<ffffffff815e8525>] __netif_receive_skb_core+0x6f5/0x940
> > > > [ 253.619353] [<ffffffff815e8788>] __netif_receive_skb+0x18/0x60
> > > > [ 253.619360] [<ffffffff815e87f8>] netif_receive_skb_internal+0x28/0x90
> > > > [ 253.619366] [<ffffffff815e91f5>] napi_gro_frags+0x125/0x1a0
> > > > [ 253.619378] [<ffffffffa01b1173>] mlx4_en_process_rx_cq+0x753/0xb50
> > > [mlx4_en]
> > > > [ 253.619387] [<ffffffffa01b1657>] mlx4_en_poll_rx_cq+0x97/0x160
> > > [mlx4_en]
> > >
> > > What makes you think this is Xen specific?  I suggest raising this the
> > > the mlx4 maintainers.
> > >
> > >
> > Linux native and KVM guests (same hw, same kernel version+config) run just
> > fine under the same workload.
> > 
> Ping?
> 
> >From the fact that bare-metal and KVM works fine with this hardware I
> still think it's reasonable to assume that it's a Xen issue and not a
> mlx4 issue.
> 
> Is this completely flawed?

I have a feeling it is an mlx4 issue but you don't easily reproduce it
under baremetal. Is there any way you could boot baremetal with
'iommu=soft swiotlb=force' to see if you can reproduce it under those
conditions?

thanks!
> 
> Thanks,
> -Christoffer
> 
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