Re: [CentOS-virt] Major stability problems with xen 4.6.6

[Nathan March]

> It seems the patch you mentioned was merged to upstream Linux here:
>
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i
> d=71472fa9c52b1da27663c275d416d8654b905f05
> 
> and then reverted/removed here:
>
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i
> d=896d81fefe5d1919537db2c2150ab6384e4a6610
> 
> Do you know if there has been proper/fixed patch after that? has it been
> merged to upstream Linux kernel already?

Interesting! I didn't come across that when digging into this.

It looks like this hasn't been followed up on at all  since April:
https://lists.gt.net/engine?list=linux;do=search_results;search_type=AND;sea
rch_forum=forum_1;search_string=ldisc%20reopened=post_time

Currently I've got ~40 dom0's running with the patch on 4.9.44-39 and it's
resolved all stability issues, previously I was seeing multiple crashes a
week.

Cheers,
Nathan

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Re: [CentOS-virt] Major stability problems with xen 4.6.6

[Pasi Kärkkäinen]

Hi,

On Thu, Aug 24, 2017 at 03:45:46PM -0700, Nathan March wrote:
>Just in case anyone else on this list is running into similar issues, I
>can confirm that the patch appears to have resolved this.
> 
> 
>I've opened [1]https://bugs.centos.org/view.php?id=13713
> 
> 
>It was so bad that having the system under load (with rpmbuild) and
>opening another ssh window or two would almost always cause the oops.
>

It seems the patch you mentioned was merged to upstream Linux here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71472fa9c52b1da27663c275d416d8654b905f05

and then reverted/removed here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=896d81fefe5d1919537db2c2150ab6384e4a6610

Do you know if there has been proper/fixed patch after that? has it been merged 
to upstream Linux kernel already? 


Thanks,

-- Pasi

> 
> 
>Cheers,
> 
>Nathan
> 
> 
> 
>From: CentOS-virt [mailto:centos-virt-boun...@centos.org] On Behalf Of
>Nathan March
>Sent: Wednesday, August 23, 2017 3:32 PM
>To: 'Discussion about the virtualization on CentOS'
>
>Subject: Re: [CentOS-virt] Major stability problems with xen 4.6.6
> 
> 
> 
>This appears to be a centos kernel issue rather than a xen one.
> 
> 
> 
>[2]https://lkml.org/lkml/2016/5/17/440
> 
> 
> 
>Digging through the posts and not clear why this never made it upstream...
> 
> 
> 
>I'm going to apply that patch to my systems and see if it resolves, but
>won't know for certain until a week or two of stability goes by.
> 
> 
> 
>- Nathan
> 
> 
> 
> 
> 
>From: CentOS-virt [[3]mailto:centos-virt-boun...@centos.org] On Behalf Of
>Nathan March
>Sent: Wednesday, August 23, 2017 2:48 PM
>To: [4]centos-virt@centos.org
>Subject: [CentOS-virt] Major stability problems with xen 4.6.6
> 
> 
> 
>Hi,
> 
> 
> 
>I'm seeing numerous crashes on the xen 4.6.6-1 / 4.6.6-2 releases, on both
>the 4.9.34-29 and 4.9.39-29 kernels.
> 
> 
> 
>I've attached a txt with two different servers outputs.
> 
> 
> 
>Xen-028: This crashed this morning while running 4.6.6-1 and 4.9.39-29
> 
>Xen-001: This crashed shortly after being upgraded to 4.6.6-2 and
>4.9.34-29
> 
> 
> 
>Both are on different hardware platforms, and have had a long history of
>being stable until these upgrades.
> 
> 
> 
>It sounds potentially related to
>
> [5]https://kernel.googlesource.com/pub/scm/linux/kernel/git/tiwai/sound-unstable/+/9ce119f318ba1a07c29149301f1544b6c4bea52a%5E%21/
>but I've confirmed this patch is in the above kernels.
> 
> 
> 
>Any suggestions / thoughts?
> 
> 
> 
>Cheers,
> 
>Nathan

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