Backport patch to fix Segmentation Faults caused by greenlet and Python 3.10b2

dcdc9442ed94f0857a62de40e17e588250f0576e.patch

@@ -0,0 +1,34 @@
+From dcdc9442ed94f0857a62de40e17e588250f0576e Mon Sep 17 00:00:00 2001
+From: Mike Bayer <mike_mp@zzzcomputing.com>
+Date: Wed, 2 Jun 2021 23:07:28 -0400
+Subject: [PATCH] delete exception traceback in _expect_raises
+
+a new segfault is observed in python 3.10.0b2 in conjunction
+with asyncio and possibly greenlet.   Ensuring the
+traceback object is deleted from scope here, which is a
+good idea anyway, apparently seems to resolve the issue.
+
+Change-Id: Ia83bafb088ef19853044f1d436db259cbfd1e5f4
+References: https://github.com/python-greenlet/greenlet/issues/242
+---
+ lib/sqlalchemy/testing/assertions.py | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/lib/sqlalchemy/testing/assertions.py b/lib/sqlalchemy/testing/assertions.py
+index 9ff2f76eb5..b618021a67 100644
+--- a/lib/sqlalchemy/testing/assertions.py
++++ b/lib/sqlalchemy/testing/assertions.py
+@@ -372,6 +372,13 @@ def _expect_raises(except_cls, msg=None, check_context=False):
+             _assert_proper_exception_context(err)
+         print(util.text_type(err).encode("utf-8"))
+ 
++    # it's generally a good idea to not carry traceback objects outside
++    # of the except: block, but in this case especially we seem to have
++    # hit some bug in either python 3.10.0b2 or greenlet or both which
++    # this seems to fix:
++    # https://github.com/python-greenlet/greenlet/issues/242
++    del ec
++
+     # assert outside the block so it works for AssertionError too !
+     assert success, "Callable did not raise an exception"
+ 

python-sqlalchemy.spec

@@ -35,6 +35,10 @@ Source0:        https://files.pythonhosted.org/packages/source/S/%{srcname}/%{sr
 # Downstream report: https://bugzilla.redhat.com/show_bug.cgi?id=1959305
 Patch1:         0001-filter-out-DeprecationWarnings.patch
 
+# SQLAlchemy segfault with Python 3.10 due to error in greenlet
+# Upstream report: https://github.com/python-greenlet/greenlet/issues/242
+Patch2:         https://github.com/sqlalchemy/sqlalchemy/commit/dcdc9442ed94f0857a62de40e17e588250f0576e.patch
+
 BuildRequires:  gcc
 BuildRequires:  python3-devel >= 3.6
 BuildRequires:  python3-greenlet >= 1.0
@@ -86,6 +90,7 @@ This package includes the python 3 version of the module.
 %prep
 %setup -q -n %{srcname}-%{srcversion}
 %patch1 -p1
+%patch2 -p1
 
 # Remove flag for pytest-xdist. (python2-pytest-xdist is a removed dependency.)
 # (--max-worker-restart=5 would end the test run after 5 crashing tests.)