Python ctypes MemoryError in fcgi process from PIL library
I have temporarily fixed that error commenting the last line in this file $HOME/lib/python2.7/ctypes/__init__.py
that is something like #CFUNCTYPE(c_int)(lambda: None)
.
That's work for me, but i don't know what exactly the problem is.
UPDATE
In python 2.7.3 the line number is :279 not the last as I said above.
UPDATE 2Since the line may vary between minor versions, you should look for a chunk of code that looks something like this:
# XXX for whatever reasons, creating the first instance of a callback# function is needed for the unittests on Win64 to succeed. This MAY# be a compiler bug, since the problem occurs only when _ctypes is# compiled with the MS SDK compiler. Or an uninitialized variable?CFUNCTYPE(c_int)(lambda: None)
try running this command:
setsebool -P httpd_tmp_exec on
fixes things for me on CentOS. Taken from this post:https://bugzilla.redhat.com/show_bug.cgi?id=645193
Just to expand on eos87's answer a bit, this does fix the problem for me as well, and judging by the comment before that line, it sounds like it was added as a workaround to a windows bug, but the workaround is apparently causing trouble of its own. Here's the bit at the end of __init__.py
:
# XXX for whatever reasons, creating the first instance of a callback# function is needed for the unittests on Win64 to succeed. This MAY# be a compiler bug, since the problem occurs only when _ctypes is# compiled with the MS SDK compiler. Or an uninitialized variable?CFUNCTYPE(c_int)(lambda: None)
It looks like it's safe to remove.
FWIW, this issue showed up for me on a Centos 5.7 x64 box when using python 2.6 as installed (in parallel with python 2.4) from epel. The file was found here: /usr/lib64/python2.6/ctypes/__init__.py
Also note that the exception that shows up is a MemoryError which according to strace
results from a segmentation fault immediately (though perhaps coincidentally) after a call to munmap
; and it only shows up when running as FastCGI.