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Re: Debian 10, xen 4.11 reliability


  • To: xen-users@xxxxxxxxxxxxxxxxxxxx, Casper <kl@xxxxx>
  • From: Hans van Kranenburg <hans@xxxxxxxxxxx>
  • Date: Mon, 13 Jul 2020 19:02:07 +0200
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  • Delivery-date: Mon, 13 Jul 2020 17:04:02 +0000
  • List-id: Xen user discussion <xen-users.lists.xenproject.org>

Hi Casper,

On 7/9/20 10:45 AM, Casper wrote:
> 
> I have used Debian/Xen dom0 for many years, Debian 7, 3.2.41 kernel with 
> Xen 4.1.4 on some servers still work very reliable with no problems, 
> only wanted to change new hard discs pushed me to install new Debian 10 
> with Xen packages to newer version.
> 
> Where I reinstall Debian 10, latest 4.19 kernel it comes with Xen 
> 4.11.4-pre all crashes in 1-2weeks. In start I was blaming HW, but now 
> it repeats in old reliable servers too. My config is I have 2-3 hard 
> discs per server node and RAID1 with sw md raid, it crashes with md lost 
> access for disc. After reboot all works as it should.
> 
> I tested different HW and discs, all the same problems.
> Loads are no big, just few testing DomU nodes.
> Any suggestion? I`m currently running latest Debian kernel 4.19 was 
> thinking to downgrade to test different kernel.
> Or problem with Debian Xen package as it not so popular anymore?
> Any suggestion what to test to figure out problem?

The first suggestion is, like Sarah also mentions, capturing logging,
and providing that. Also, all details possible, do not leave out minor
things that you think "this for sure won't cause it" about. Even your
raid controller type.

Does the entire machine crash? Or does only a virtual machine crash? Are
the domUs also Debian Buster?

If something crashes, can you still login to the dom0? Can you do dmesg
and xl dmesg there?

If a domU crashes, then enable logging of the xen console to log files
on the dom0. Also look at xl dmesg to see if there's anything added
while it happens, pointing at Xen choosing to destroy the domU when it's
trying to do something that's absolutely not allowed.

If it completely crashes, then you need a serial console to capture
whatever it tries to tell you in the last breath, because, otherwise
it's invisible.

Use loglvl=all and guest_loglvl=all on the hypervisor command line
(GRUB_CMDLINE_XEN_DEFAULT in /etc/default/grub.d/xen.cfg).

Also, at least update to newest xen and kernel packages in Buster.
That's 4.11.4+24-gddaaccbbab-1~deb10u1 for Xen and 4.19.118-2+deb10u1
for Linux.

When only saying 'it does not work', nobody can help you.

Hans



 


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