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migration: add trace point when vm_stop_force_state fails
This is a critical failure scenario for migration that is hard to diagnose from existing probes. Most likely it is caused by an error from bdrv_flush(), but we're not logging the errno anywhere, hence this new probe. Reviewed-by: Connor Kuehl <ckuehl@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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