FreeNAS

There seem to be many similar tracebacks like this:

[2018/09/11 13:15:36] (WARNING) middlewared._loop_monitor_thread():1106 - Task seems blocked:  File "/usr/local/lib/python3.6/site-packages/middlewared/plugins/alert.py", line 194, in process_alerts
    alert_service = factory(self.middleware, alert_service_desc["attributes"])
  File "/usr/local/lib/python3.6/site-packages/middlewared/plugins/../alert/service/snmp_trap.py", line 30, in __init__
    resolveWithMib(mib_view_controller)
  File "/usr/local/lib/python3.6/site-packages/pysnmp/smi/rfc1902.py", line 357, in resolveWithMib
    ifAvailable=True, ifNotAdded=True)
  File "/usr/local/lib/python3.6/site-packages/pysnmp/smi/compiler.py", line 51, in addMibCompiler
    compiler = MibCompiler(parserFactory(**smiV1Relaxed)(),
  File "/usr/local/lib/python3.6/site-packages/pysmi/parser/smi.py", line 59, in __init__
    errorlog=logger)
  File "/usr/local/lib/python3.6/site-packages/ply/yacc.py", line 3438, in yacc
    lr = LRGeneratedTable(grammar, method, debuglog)
  File "/usr/local/lib/python3.6/site-packages/ply/yacc.py", line 2135, in __init__
    self.lr_parse_table()
  File "/usr/local/lib/python3.6/site-packages/ply/yacc.py", line 2551, in lr_parse_table
    self.add_lalr_lookaheads(C)
  File "/usr/local/lib/python3.6/site-packages/ply/yacc.py", line 2515, in add_lalr_lookaheads
    trans = self.find_nonterminal_transitions(C)
  File "/usr/local/lib/python3.6/site-packages/ply/yacc.py", line 2292, in find_nonterminal_transitions
    if t not in trans:

It seems we are running synchronous code within a coroutine while instantiating the alert service class.

There are a few ways I can think of we can improve this but obviously you're more familiar with that than me ; )