https://github.com/redis/redis/commit/1de65ebff644189631acf4d6ebd9f25c53f6a494
is broken with BSD ps(1).

Index: tests/support/util.tcl
--- tests/support/util.tcl.orig
+++ tests/support/util.tcl
@@ -585,9 +585,9 @@ proc process_is_alive pid {
 proc pause_process pid {
     exec kill -SIGSTOP $pid
     wait_for_condition 50 100 {
-        [string match {*T*} [lindex [exec ps j $pid] 16]]
+        [string match {*T*} [lindex [exec ps j -p $pid] 16]]
     } else {
-        puts [exec ps j $pid]
+        puts [exec ps j -p $pid]
         fail "process didn't stop"
     }
 }
