Looks like a lock isn't being freed or a lock priority inversion, etc.
Tricky.

On Mon, Sep 28, 2015 at 3:10 PM, 'Lukasz Szajkowski' via modwsgi <
[email protected]> wrote:

> The actual stack trace while hanging is
> #0  0x00007f047ff099b0 in sem_wait () from /lib64/libpthread.so.0
> #1  0x00007f0474b4c6d8 in PyThread_acquire_lock_timed () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #2  0x00007f0474b2cab5 in _PyImport_AcquireLock () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #3  0x00007f0474b2cf49 in PyImport_ImportModuleLevelObject () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #4  0x00007f0474b10f8f in ?? () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #5  0x00007f0474b1baa4 in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #6  0x00007f0474b1b0f9 in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #7  0x00007f0474b1c457 in PyEval_EvalCodeEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #8  0x00007f0474b1aead in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #9  0x00007f0474b1b0f9 in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #10 0x00007f0474b1b0f9 in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #11 0x00007f0474b1b0f9 in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #12 0x00007f0474b1b0f9 in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #13 0x00007f0474b1b0f9 in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #14 0x00007f0474b1b0f9 in PyEval_EvalFrameEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #15 0x00007f0474b1c457 in PyEval_EvalCodeEx () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #16 0x00007f0474a90842 in ?? () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #17 0x00007f0474a69fd6 in PyObject_Call () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #18 0x00007f0474b11763 in PyEval_CallObjectWithKeywords () from
> /opt/rh/python33/root/usr/lib64/libpython3.3m.so.1.0
> #19 0x00007f0474e8f6ac in ?? () from
> /opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
> #20 0x00007f0474e93f8b in ?? () from
> /opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
> #21 0x00007f0474e976c8 in ?? () from
> /opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
> #22 0x00007f047ff03a51 in start_thread () from /lib64/libpthread.so.0
> #23 0x00007f047fc509ad in clone () from /lib64/libc.so.6
>
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