ansible: MITOGEN_DUMP_THREAD_STACKS for mux process too

ansible_mitogen/process.py

@@ -35,6 +35,7 @@ import sys
 
 import mitogen
 import mitogen.core
+import mitogen.debug
 import mitogen.master
 import mitogen.parent
 import mitogen.service
@@ -145,6 +146,8 @@ class MuxProcess(object):
         )
         if 'MITOGEN_ROUTER_DEBUG' in os.environ:
             self.router.enable_debug()
+        if 'MITOGEN_DUMP_THREAD_STACKS' in os.environ:
+            mitogen.debug.dump_to_logger()
 
     def _setup_services(self):
         """

docs/ansible.rst

@@ -648,6 +648,9 @@ is necessary. File-based logging can be enabled by setting
 When file-based logging is enabled, one file per context will be created on the
 local machine and every target machine, as ``/tmp/mitogen.<pid>.log``.
 
+If you are experiencing a hang, ``MITOGEN_DUMP_THREAD_STACKS=1`` causes every
+process to dump every thread stack into the logging framework every 5 seconds.
+
 
 Getting Help
 ~~~~~~~~~~~~