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If the vt gets a vhangup from under us, then the tty will appear ready in select(), but trying to tcflush() it will return -EIO, so we'll spin around at 100% CPU for no reason. Notice this condition and unregister the handler if it happens. Signed-off-by: Adam Jackson <ajax@redhat.com> Reviewed-by: Mikhail Gusarov <dottedmag@dottedmag.net> Reviewed-by: Julien Cristau <jcristau@debian.org> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>