a) What happens if an affected user, who has qemu crashing due to the
low vm.max_map_count limit of 65530, installs this updated qemu package,
but does NOT raise the vm.max_map_count limit?

It's my understanding not even qemu itself can raise that limit in the
example scenario, where it's running inside a container (unless it's a
privileged container?).

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https://bugs.launchpad.net/bugs/2168803

Title:
  QEMU 8.2.2 guests crash by exhausting vm.max_map_count with coroutines

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