[ python-Bugs-969492 ] Python hangs up on I/O operations on the latest FreeBSD 4.10

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Mon Oct 3 15:36:55 CEST 2005


Bugs item #969492, was opened at 2004-06-09 12:03
Message generated for change (Comment added) made by birkenfeld
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Category: None
Group: Python 2.3
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: _Iww_ (iww)
Assigned to: Nobody/Anonymous (nobody)
Summary: Python hangs up on I/O operations on the latest FreeBSD 4.10

Initial Comment:
Hello, friends!
Here is my sample code, which works perfectly on other systems, but not 
the FreeBSD 4.10-STABLE I got today by cvsupping.

#!/usr/local/bin/python
from threading import Thread
class Reading(Thread):
 def __init__(self):
  Thread.__init__(self)
 def run(self):
  print "Start!"
  z = 1
  while 1:
   print z
   z += 1
   fl = open('blah.txt')
   fl.read()
   fl.close()

for i in range(10):
 print "i:", i
 zu = open('bzzz.txt')
 print "|->", zu.read()
 bzz = Reading()
 bzz.start()
#---
I have tested this on Python 2.3.3, 2.3.4 and 2.4a0 from CVS.
The interpretar falls in the infinite loop and stays in the poll-state.
You can see it in the top:
34446 goga        2   0  3328K  2576K poll     0:00  0.00%  0.00% python

I think it has some connection to the latest bug, found in the select() 
function (http://www.securityfocus.com/bid/10455) and its fix on BSD.

Best regards,
_Iww_

----------------------------------------------------------------------

>Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-10-03 15:36

Message:
Logged In: YES 
user_id=1188172

Closing then.

----------------------------------------------------------------------

Comment By: _Iww_ (iww)
Date: 2005-10-03 14:56

Message:
Logged In: YES 
user_id=1059927

nnorwitz, thank you for your attantion!
It was really a short problem in FreeBSD sources. The last version of python did
not worked well.
The bug was solved shortly after my post.

Best regards,
_Iww_

----------------------------------------------------------------------

Comment By: Neal Norwitz (nnorwitz)
Date: 2005-10-03 06:05

Message:
Logged In: YES 
user_id=33168

iww, is this a FreeBSD bug?  Does the problem still exist?

----------------------------------------------------------------------

Comment By: Jeff Epler (jepler)
Date: 2004-06-21 23:52

Message:
Logged In: YES 
user_id=2772

Indentation was lost on your example.  Please attach it it
to the bug report as a file instead.

In my opinion, the problem you're having is unlikely to be
related to the securityfocus URL you mentioned.

----------------------------------------------------------------------

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