uwsgi segmentation fault when serving a django application

Question

I am trying to migrate a django application from one server to another. The application is working fine on the old server.

On the new server, the application works fine when used using Django's runserver.

To test the django application under uwsgi, I used

uwsgi --http :8000 --module mysite.wsgi

This opens the django admin page as expected but as soon as I try to login, uwsgi gets a segmentation fault error which is as follows.

Would greatly appreciate if anybody could help understand what this means, and how might I fix this.

---

*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI worker 1 (and the only) (pid: 15398, cores: 1)
!!! uWSGI process 15398 got Segmentation Fault !!!
*** backtrace of 15398 ***
uwsgi(uwsgi_backtrace+0x35) [0x5569e2f17555]
uwsgi(uwsgi_segfault+0x23) [0x5569e2f17903]
/lib/x86_64-linux-gnu/libc.so.6(+0x35fc0) [0x7f0dd221bfc0]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/.libs/./libssl-1d6df745.so.1.0.2p(ssl3_cleanup_key_block+0xb) [0x7f0dd0241cab]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/.libs/./libssl-1d6df745.so.1.0.2p(ssl3_clear+0x16) [0x7f0dd023f5a6]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/.libs/./libssl-1d6df745.so.1.0.2p(tls1_clear+0x9) [0x7f0dd024b219]
/usr/lib/x86_64-linux-gnu/libssl.so.1.1(SSL_new+0x43f) [0x7f0dd2bf376f]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/.libs/libpq-3a62a61f.so.5.11(+0x23969) [0x7f0dd04d6969]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/.libs/libpq-3a62a61f.so.5.11(+0x24fc5) [0x7f0dd04d7fc5]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/.libs/libpq-3a62a61f.so.5.11(PQconnectPoll+0xb78) [0x7f0dd04c1ba8]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/.libs/libpq-3a62a61f.so.5.11(+0xfa28) [0x7f0dd04c2a28]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/.libs/libpq-3a62a61f.so.5.11(PQconnectdb+0x1f) [0x7f0dd04c541f]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/_psycopg.cpython-36m-x86_64-linux-gnu.so(+0x12651) [0x7f0dd0716651]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/_psycopg.cpython-36m-x86_64-linux-gnu.so(+0x133df) [0x7f0dd07173df]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x1fcab2) [0x7f0dd25d9ab2]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyObject_FastCallDict+0x89) [0x7f0dd2645e99]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyObject_CallFunction_SizeT+0x124) [0x7f0dd26468b4]
/home/vikas/ssersurvey/env/lib/python3.6/site-packages/psycopg2/_psycopg.cpython-36m-x86_64-linux-gnu.so(+0xc1a8) [0x7f0dd07101a8]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(PyCFunction_Call+0x96) [0x7f0dd25f0fe6]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x7940) [0x7f0dd2561f10]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17ba3f) [0x7f0dd2558a3f]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(PyEval_EvalCodeEx+0x3e) [0x7f0dd25594fe]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x23cc63) [0x7f0dd2619c63]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(PyObject_Call+0x48) [0x7f0dd26466d8]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x3de5) [0x7f0dd255e3b5]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17a8a3) [0x7f0dd25578a3]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17c2eb) [0x7f0dd25592eb]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x4ec2) [0x7f0dd255f492]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17a8a3) [0x7f0dd25578a3]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17c2eb) [0x7f0dd25592eb]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x4ec2) [0x7f0dd255f492]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17a8a3) [0x7f0dd25578a3]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17c2eb) [0x7f0dd25592eb]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x4ec2) [0x7f0dd255f492]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17ba3f) [0x7f0dd2558a3f]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17c11e) [0x7f0dd255911e]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x4ec2) [0x7f0dd255f492]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17a8a3) [0x7f0dd25578a3]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17c2eb) [0x7f0dd25592eb]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x4ec2) [0x7f0dd255f492]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17ba3f) [0x7f0dd2558a3f]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17c11e) [0x7f0dd255911e]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x3c95) [0x7f0dd255e265]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x2428a8) [0x7f0dd261f8a8]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x239aa6) [0x7f0dd2616aa6]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x239f6a) [0x7f0dd2616f6a]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x1fcab2) [0x7f0dd25d9ab2]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyObject_FastCallDict+0x89) [0x7f0dd2645e99]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17bee8) [0x7f0dd2558ee8]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x4ec2) [0x7f0dd255f492]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17a8a3) [0x7f0dd25578a3]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17c2eb) [0x7f0dd25592eb]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x4ec2) [0x7f0dd255f492]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17a8a3) [0x7f0dd25578a3]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyFunction_FastCallDict+0x2c3) [0x7f0dd2558e43]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyObject_FastCallDict+0x131) [0x7f0dd2645f41]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyObject_Call_Prepend+0xcd) [0x7f0dd264666d]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyObject_FastCallDict+0x89) [0x7f0dd2645e99]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x6bb61) [0x7f0dd2448b61]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x1f5f65) [0x7f0dd25d2f65]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x186ff9) [0x7f0dd2563ff9]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyCFunction_FastCallDict+0x13a) [0x7f0dd25f0d6a]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(+0x17c20c) [0x7f0dd255920c]
/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0(_PyEval_EvalFrameDefault+0x4ec2) [0x7f0dd255f492]
*** end of backtrace ***

Answer 1

This error occurs when uwsgi and psycopg are compiled against two different openssl versions. You have two solution.

• disable ssl of django database configuration (the other answer's solution)
• Install psyocpg2 from source instead of wheel

to install psyocpg2 from source you have to uninstall previous one and try this

pip uninstall psycopg2
pip install --no-binary :all: psycopg2

Answer 2

Pyuwsgi can be used instead of building uWSGI from source. It is a wheel, but excludes the SSL plugin so it should workaround the incompatibility.

Answer 3

The issue is related to the connection to PostgreSQL with uWSGI.

Try to disable SSL if feasible in your

# Database
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mydb',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',
        'HOST': 'localhost',
        'PORT': '',
        'OPTIONS': {
            'sslmode': 'disable'
        }
    }
}