Re: [Xen-devel] Xen-unstable Linux 3.14-rc3 and 3.13 Network troubles

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Feb 18, 2014 at 10:25:13PM +0100, Sander Eikelenboom wrote:
> Hi All,
> 
> I'm currently having some network troubles with Xen and recent linux kernels.
> 
> - When running with a 3.14-rc3 kernel in dom0 and a 3.13 kernel in domU
>   I get what seems to be described in this thread: 
> http://www.spinics.net/lists/netdev/msg242953.html
> 

I *think* that issue should've been fixed -- not with that patch but with
a different one. *sigh*

>   In the guest:
>   [57539.859584] net eth0: rx->offset: 0, size: 4294967295
>   [57539.859599] net eth0: rx->offset: 0, size: 4294967295
>   [57539.859605] net eth0: rx->offset: 0, size: 4294967295
>   [57539.859610] net eth0: Need more slots
>   [58157.675939] net eth0: Need more slots
>   [58725.344712] net eth0: Need more slots
>   [61815.849180] net eth0: rx->offset: 0, size: 4294967295
>   [61815.849205] net eth0: rx->offset: 0, size: 4294967295
>   [61815.849216] net eth0: rx->offset: 0, size: 4294967295
>   [61815.849225] net eth0: Need more slots
> 
>   Xen reports:
>   (XEN) [2014-02-18 03:22:47] grant_table.c:1857:d0 Bad grant reference 
> 19791875
>   (XEN) [2014-02-18 03:42:33] grant_table.c:1857:d0 Bad grant reference 
> 268435460
>   (XEN) [2014-02-18 04:15:23] grant_table.c:289:d0 Increased maptrack size to 
> 14 frames
>   (XEN) [2014-02-18 04:15:27] grant_table.c:289:d0 Increased maptrack size to 
> 15 frames
>   (XEN) [2014-02-18 04:15:48] grant_table.c:289:d0 Increased maptrack size to 
> 16 frames
>   (XEN) [2014-02-18 04:15:50] grant_table.c:289:d0 Increased maptrack size to 
> 17 frames
>   (XEN) [2014-02-18 04:15:55] grant_table.c:289:d0 Increased maptrack size to 
> 18 frames
>   (XEN) [2014-02-18 04:15:55] grant_table.c:289:d0 Increased maptrack size to 
> 19 frames
>   (XEN) [2014-02-18 04:15:56] grant_table.c:289:d0 Increased maptrack size to 
> 20 frames
>   (XEN) [2014-02-18 04:15:56] grant_table.c:289:d0 Increased maptrack size to 
> 21 frames
>   (XEN) [2014-02-18 04:15:59] grant_table.c:289:d0 Increased maptrack size to 
> 22 frames
>   (XEN) [2014-02-18 04:15:59] grant_table.c:289:d0 Increased maptrack size to 
> 23 frames
>   (XEN) [2014-02-18 04:16:00] grant_table.c:289:d0 Increased maptrack size to 
> 24 frames
>   (XEN) [2014-02-18 04:16:05] grant_table.c:289:d0 Increased maptrack size to 
> 25 frames
>   (XEN) [2014-02-18 04:16:05] grant_table.c:289:d0 Increased maptrack size to 
> 26 frames
>   (XEN) [2014-02-18 04:16:06] grant_table.c:289:d0 Increased maptrack size to 
> 27 frames
>   (XEN) [2014-02-18 04:16:12] grant_table.c:289:d0 Increased maptrack size to 
> 28 frames
>   (XEN) [2014-02-18 04:16:18] grant_table.c:289:d0 Increased maptrack size to 
> 29 frames
>   (XEN) [2014-02-18 04:17:00] grant_table.c:1857:d0 Bad grant reference 
> 268435460
>   (XEN) [2014-02-18 04:17:00] grant_table.c:1857:d0 Bad grant reference 
> 268435460
>   (XEN) [2014-02-18 04:34:03] grant_table.c:1857:d0 Bad grant reference 
> 4325377
> 

Judging from the log above I presume it happens after DomU has been
running for quite a while? Could you elaborate on the exact steps to
reproduce?

Does it happen when you use 3.13 as backend?

> 
> 
> Another issue with networking is when running both dom0 and domU's with a 
> 3.14-rc3 kernel:
>   - i can ping the guests from dom0
>   - i can ping dom0 from the guests
>   - But i can't ssh or access things by http
>   - I don't see any relevant error messages ...
>   - This is with the same system and kernel config as with the 3.14 and 3.13 
> combination above
>     (that previously worked fine)

I think I am able to reproduce this. I'm looking into it now. Luckily
there isn't that many changesets between 3.13 and 3.14.


Wei.

> 
> --
> 
> Sander

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