Public bug reported:

[Impact]
Xen guests may hang during resume after a migration or suspend.

[Test Case]
Create a Xen guest and run this script and then suspending the VM:

    import pyxs, time
    c = pyxs.client.Client(xen_bus_path="/dev/xen/xenbus")
    c.connect()
    c.transaction()
    time.sleep(3600)

[Fix]
The following upstream commit fixes the issue:

"xenbus: Avoid deadlock during suspend due to open transactions"
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d10e0cc113c9e1b64b5c6e3db37b5c839794f3df

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1845033

Title:
  xenbus: Avoid deadlock during suspend due to open transactions

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