#22017: RuntimeError: dictionary changed size during iteration
-------------------------------+-------------------------
Reporter: quinox | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.7-alpha-1
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------+-------------------------
This bug report is identical to #21049 but for Django 1.7.
I run Django 1.7a2 with a Python3 virtualenv. Occasionally the runserver
crashes with the following stacktrace:
{{{
System check identified no issues (0 silenced).
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/core/management/__init__.py", line 427, in
execute_from_command_line
utility.execute()
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/core/management/__init__.py", line 419, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/core/management/base.py", line 287, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/core/management/base.py", line 336, in execute
output = self.handle(*args, **options)
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/core/management/commands/runserver.py", line 81, in handle
self.run(*args, **options)
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/core/management/commands/runserver.py", line 90, in run
autoreload.main(self.inner_run, args, options)
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/utils/autoreload.py", line 267, in main
reloader(wrapped_main_func, args, kwargs)
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/utils/autoreload.py", line 233, in python_reloader
reloader_thread()
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/utils/autoreload.py", line 212, in reloader_thread
if fn():
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/utils/autoreload.py", line 139, in inotify_code_changed
update_watch()
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/utils/autoreload.py", line 132, in update_watch
for path in gen_filenames():
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/utils/autoreload.py", line 84, in gen_filenames
filenames = [filename.__file__ for filename in sys.modules.values()
File "/home/quinox/projecten/deadlines/virtual/lib/python3.3/site-
packages/django/utils/autoreload.py", line 84, in <listcomp>
filenames = [filename.__file__ for filename in sys.modules.values()
RuntimeError: dictionary changed size during iteration
}}}
The issue shows up sporadically, it can usually be triggered within 10
minutes by running the following command in a shell:
{{{
#!bash
while true ; do touch project/xxx/models.py ; sleep 1s; done
}}}
The fix as suggested in #21049 seems to fix the issue, I haven't seen the
runserver crash since I modified `django/utils/autoreload.py` lines 84-85
from:
{{{
#!python
filenames = [filename.__file__ for filename in sys.modules.values()
if hasattr(filename, '__file__')]
}}}
to
{{{
#!python
filenames = [filename.__file__ for filename in list(sys.modules.values())
if hasattr(filename, '__file__')]
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/22017>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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