From: Aurelien Jarno <aurel32@debian.org>
URL: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1112101#12

--- guestfs-tools-1.52.3.orig/align/test-virt-alignment-scan-guests.sh
+++ guestfs-tools-1.52.3/align/test-virt-alignment-scan-guests.sh
@@ -21,7 +21,7 @@ skip_if_skipped
 
 libvirt_uri="test://$abs_top_builddir/test-data/phony-guests/guests-all-good.xml"
 
-$VG virt-alignment-scan -c "$libvirt_uri"
+$VG virt-alignment-scan -P$(nproc) -c "$libvirt_uri"
 r=$?
 
 # 0, 2 and 3 are reasonable non-error exit codes.  Others are errors.
--- guestfs-tools-1.52.3.orig/df/test-virt-df-guests.sh
+++ guestfs-tools-1.52.3/df/test-virt-df-guests.sh
@@ -25,4 +25,4 @@ skip_if_skipped
 
 libvirt_uri="test://$abs_top_builddir/test-data/phony-guests/guests.xml"
 
-$VG virt-df -c "$libvirt_uri"
+$VG virt-df -P $(nproc) -c "$libvirt_uri"