New submission from Terry J. Reedy <[email protected]>:
This is a spinoff from #38689, about 'strange_callable(' in Shell hanging,
because there is an uncaught exception is the run process. (See issue for
'strange_callable'.) Running IDLE from Windows Command Prompt, Windows
eventually shows the circle cursor. Clicking on the window turns it gray and
trying to close it by clicking 'X' brings up 'Python is not responding' with
options to Wait, Close, or Try to Restore. I have seen this before with other
code.
Restore results in the GUI process RESTARTing a run process and the following
in the console.
Exception in Tkinter callback
Traceback (most recent call last):
File "f:\dev\3x\lib\idlelib\rpc.py", line 359, in pollpacket
s = self.sock.recv(BUFSIZE)
ConnectionResetError: [WinError 10054] An existing connection was forcibly
closed by the remote host
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "f:\dev\3x\lib\idlelib\rpc.py", line 432, in pollresponse
message = self.pollmessage(wait)
File "f:\dev\3x\lib\idlelib\rpc.py", line 384, in pollmessage
packet = self.pollpacket(wait)
File "f:\dev\3x\lib\idlelib\rpc.py", line 361, in pollpacket
raise EOFError
EOFError
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "f:\dev\3x\lib\tkinter\__init__.py", line 1885, in __call__
return self.func(*args)
File "f:\dev\3x\lib\idlelib\multicall.py", line 176, in handler
r = l[i](event)
File "f:\dev\3x\lib\idlelib\calltip.py", line 51, in try_open_calltip_event
self.open_calltip(False)
File "f:\dev\3x\lib\idlelib\calltip.py", line 70, in open_calltip
argspec = self.fetch_tip(expression)
File "f:\dev\3x\lib\idlelib\calltip.py", line 95, in fetch_tip
return rpcclt.remotecall("exec", "get_the_calltip",
File "f:\dev\3x\lib\idlelib\rpc.py", line 219, in remotecall
return self.asyncreturn(seq)
File "f:\dev\3x\lib\idlelib\rpc.py", line 248, in asyncreturn
response = self.getresponse(seq, wait=0.05)
File "f:\dev\3x\lib\idlelib\rpc.py", line 291, in getresponse
response = self._getresponse(myseq, wait)
File "f:\dev\3x\lib\idlelib\rpc.py", line 311, in _getresponse
response = self.pollresponse(myseq, wait)
File "f:\dev\3x\lib\idlelib\rpc.py", line 436, in pollresponse
self.handle_EOF()
File "f:\dev\3x\lib\idlelib\pyshell.py", line 389, in handle_EOF
raise EOFError
EOFError
(Close, after confirmation, results in nothing except the Windows > prompt.)
This suggests to me that the remote process running idlelib.run should have an
outer try-except that catches everything and sends "I am stopping" before
exiting. The GUI process would then RESTART a new subprocess. There are
conditions under which this already happens, so it seems that the current
trigger just needs to be broadened.
----------
assignee: terry.reedy
components: IDLE
messages: 356009
nosy: terry.reedy
priority: normal
severity: normal
stage: needs patch
status: open
title: IDLE should restart instead of hanging when subprocess exits
type: behavior
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Python tracker <[email protected]>
<https://bugs.python.org/issue38695>
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