The Guile process taking the role of PID 1 during Guix builds does not reap
zombie processes, which makes them continue responding to "kill -0".

--- a/src/testsuite/stop-server.sh	2015-02-05 11:24:00.535908842 +0100
+++ b/src/testsuite/stop-server.sh	2015-02-05 11:25:00.264351349 +0100
@@ -1,6 +1,21 @@
 #!/bin/sh
 # ngIRCd Test Suite
 
+process_is_alive(){
+    ! process_is_dead "$1" && ! process_is_undead "$1"
+}
+
+process_is_dead(){
+    ! kill -0 "$1"
+}
+
+process_is_undead(){
+    case $(ps -p "$1" -o state=) in
+        (Z*) true ;;
+        (*) false ;;
+    esac
+}
+
 [ -z "$srcdir" ] && srcdir=`dirname $0`
 
 # read in functions
@@ -24,7 +40,7 @@
 
 # waiting ...
 for i in 1 2 3 4 5; do
-  kill -0 $pid > /dev/null 2>&1; r=$?
+  process_is_alive $pid > /dev/null 2>&1; r=$?
   if [ $r -ne 0 ]; then
     echo " ok".
     exit 0
tion>
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<tr><td><span title='2021-07-08 09:39:05 +0300'>2021-07-08</span></td><td><a href='/guix/commit/gnu/system/linux-initrd.scm?id=49e2e75ced01a821c84eb776cf42a36664eaa834'>gnu: %guile-3.0-static-stripped: Rename to %guile-static-stripped.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/make-bootstrap.scm (%guile-3.0-static-stripped): Rename
to %guile-static-stripped.
(%guile-bootstrap-tarball): Adjust accordingly.
* gnu/system/linux-initrd.scm (expression-&gt;initrd): Use
%guile-static-stripped as default guile.
* doc/guix.texi (initial RAM disk)[expression-&gt;initrd]: Adjust
documentation accordingly.
</span></span></td><td>Efraim Flashner</td></tr>