One of the XCP-ng forum users figured out what's happening. According to
him there is a bug in the serial console driver that's used in the
cloud-image installations but not iso ones. This was fixed in kernel
7.0.0-41 in upstream commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=560f4deda32785e260056200f8bb911c475c5b88
There is another commit that could trigger this that's not in the ubuntu
kernel:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=37aba16e7943634eb3e5e2e7e850ebb38500d935

See https://xcp-ng.org/forum/post/109494 for details. And thanks to
jul1an at Vates.

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https://bugs.launchpad.net/bugs/2171183

Title:
  kernel task hang after live migration of xcpng guest of cloud-image
  resolute

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