Re: [Xen-devel] [BUG] kernel bug encountered at drivers/net/xen-netback/netback.c:430!

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf
> Of Paul Durrant
> Sent: 10 January 2018 12:52
> To: 'Christoph Moench-Tegeder' <cmt@xxxxxxxxxxxxxx>
> Cc: 'Michael Collins' <mike@xxxxxxxxxxx>; 'Juergen Gross'
> <jgross@xxxxxxxx>; Wei Liu <wei.liu2@xxxxxxxxxx>; 'Alex Braunegg'
> <alex.braunegg@xxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [BUG] kernel bug encountered at drivers/net/xen-
> netback/netback.c:430!
> 
> I have tracked down the problem to multiple calls to the zerocopy callback for
> the same ubuf_info. I am not sure exactly which patch introduced the issue
> but my suspicion is that it was one of the the MSG_ZEROCOPY series (see
> https://marc.info/?l=linux-netdev&m=149807997726733&w=2).
> I have a candidate patch to netback to make use of the ubuf_info ref count
> to handle the multiple callbacks and that certainly fixes the issue for me. 
> I'll
> post this shortly recommending a backport to stable.
> 

Actually no need... The underlying issue was really a bug and has been fixed in 
4.14.11. See 
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=v4.14.13&id=17155ea827b2fd81330a442ed56d0edafd9969e1

  Paul
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