Kill ps before waiting to avoid hanging.

Author: ioquatix

lib/process/metrics/general.rb

@@ -150,7 +150,7 @@ def self.capture(pid: nil, ppid: nil, ps: PS, memory: Memory.supported?)
 
 				arguments.push("-o", FIELDS.keys.join(","))
 
-				ps_pid = Process.spawn(*arguments, out: output, pgroup: true)
+				ps_pid = Process.spawn(*arguments, out: output)
 
 				output.close
 
@@ -188,7 +188,16 @@ def self.capture(pid: nil, ppid: nil, ps: PS, memory: Memory.supported?)
 
 				return processes
 			ensure
-				Process.wait(ps_pid) if ps_pid
+				if ps_pid
+					begin
+						# Make sure to kill the ps process if it's still running:
+						Process.kill(:KILL, ps_pid)
+						# Reap the process:
+						Process.wait(ps_pid)
+					rescue => error
+						warn "Failed to cleanup ps process #{ps_pid}:\n#{error.full_message}"
+					end
+				end
 			end
 		end
 	end