Bug#880554: xen domu freezes with kernel linux-image-4.9.0-4-amd64

From	Christian Schwamborn <christian.schwamborn@nswit.de>
Newsgroups	linux.debian.bugs.rc
Subject	Bug#880554: xen domu freezes with kernel linux-image-4.9.0-4-amd64
Date	2017-11-02 09:10 +0100
Message-ID	<uHiJz-4qB-1@gated-at.bofh.it> (permalink)
Organization	nswIT

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Package: linux-image-4.9.0-4-amd64
Version: 4.9.51-1
Severity: critical

As I can tell right now, the domu system simply freezes. The logs simply 
end at some point until the new reboot stuff comes up. Sometimes it's 
still possible to log on to the system, but nothing really works. It is 
like all IO to the virtual block devices is suspended indefinitely. 
Until this happens, the systems seems to work without issues. As the new 
kernel isn't out that long, I can't tell how often this happens. first 
time was the day before yesterday and yesterday afternoon it happened 
twice within two hours.

Something like 'ls' on a directory listed before still gets a result, 
but everything 'new', i.e. 'vim somefile' will cause the shell to stall.
Sadly there is no visible error, services just fails to answer one by 
one (maybe when the try to read/write something new to the disk, then 
they simply wait for IO to happen).

For testing I installed the older kernel (last linux-image-4.9.0-3-amd64 
from security - 4.9.30-2+deb9u5) and realized immediately that the 
system boot time is a fraction with the old kernel in opposite to the 
new one. For the time being, I'm staying with that nn the production system.

To see if anything will be dumped on the console, I started one within a 
screen on a test machine. Now I have to generate some activity and IO 
and see if something happens there.

I haven't had the time to test the impact on the dom0 kernel jet, as far 
as I observed, the dom0 seems to be unaffected by the kernel update.

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Bug#880554: xen domu freezes with kernel linux-image-4.9.0-4-amd64 Christian Schwamborn <christian.schwamborn@nswit.de> - 2017-11-02 09:10 +0100
  Bug#880554: xen domu freezes with kernel linux-image-4.9.0-4-amd64 Christian Schwamborn <christian.schwamborn@nswit.de> - 2017-11-13 14:00 +0100
  Bug#880554: xen domu freezes with kernel linux-image-4.9.0-4-amd64 Martin von Wittich <martin.von.wittich@iserv.eu> - 2017-11-14 11:30 +0100
  Bug#880554: xen domu freezes with kernel linux-image-4.9.0-4-amd64 Valentin Vidic <Valentin.Vidic@CARNet.hr> - 2017-11-17 08:10 +0100

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