[Xen-devel] Re: DomU panic in net_rx_action *initiated by another DomU*; 7503:20d1a79ebe31

[Charles Duffy <cduffy@xxxxxxxxxxx>]

Ian Pratt wrote:
> I think this issue is at least approximately understood, and is present
> in all xen x86_64 kernels:
>
> rogue read-only mappings to linux heap pages left over from the 'initial
> mapping' are preventing the netfront driver unmapping pages to hand over
> as rx free buffers. This is compounded by the failure handling path
> being slightly borked.
I'm sorry to be a bother -- but is there any ETA on a fix, or a bugzilla 
entry by which I can track this issue? The only netfront-related checkin 
I see to bugzilla is a fix for bug#183, and that appears to be distinct 
(I'm not getting the "#### netfront can't alloc rx grant refs", and so 
would appear not to be hitting that code).
This is happening quite frequently for me, even when I'm *not* using the 
kernel with the unstable module which triggers it every time.
If there is no bugzilla entry, I'd be glad to start one -- but since the 
issue is described as already understood, it sounds like there's likely 
already a bug for it that I'm just not seeing.

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