Fix multiprocessing regression on newer glibcs

Enable test_multiprocessing_fork(server) and _spawn again

Resolves: rhbz#1569933

00302-fix-multiprocessing-regression-on-newer-glibcs.patch

@@ -0,0 +1,55 @@
+From a3febe3cba14b89885f42ca2f0224096a52885f6 Mon Sep 17 00:00:00 2001
+From: Antoine Pitrou <antoine@python.org>
+Date: Mon, 23 Apr 2018 13:19:42 +0200
+Subject: [PATCH] bpo-33329: Fix multiprocessing regression on newer glibcs
+
+Starting with glibc 2.27.9000-xxx, sigaddset() can return EINVAL for some
+reserved signal numbers between 1 and NSIG.  The `range(1, NSIG)` idiom
+is commonly used to select all signals for blocking with `pthread_sigmask`.
+So we ignore the sigaddset() return value until we expose sigfillset()
+to provide a better idiom.
+---
+ .../next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst  |  1 +
+ Modules/signalmodule.c                                     | 14 ++++++++------
+ 2 files changed, 9 insertions(+), 6 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst
+
+diff --git a/Misc/NEWS.d/next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst b/Misc/NEWS.d/next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst
+new file mode 100644
+index 000000000000..d1a4e56d04b9
+--- /dev/null
++++ b/Misc/NEWS.d/next/Library/2018-04-23-13-21-39.bpo-33329.lQ-Eod.rst
+@@ -0,0 +1 @@
++Fix multiprocessing regression on newer glibcs
+diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
+index 791616014384..35fd87e2d1e7 100644
+--- a/Modules/signalmodule.c
++++ b/Modules/signalmodule.c
+@@ -819,7 +819,6 @@ iterable_to_sigset(PyObject *iterable, sigset_t *mask)
+     int result = -1;
+     PyObject *iterator, *item;
+     long signum;
+-    int err;
+ 
+     sigemptyset(mask);
+ 
+@@ -841,11 +840,14 @@ iterable_to_sigset(PyObject *iterable, sigset_t *mask)
+         Py_DECREF(item);
+         if (signum == -1 && PyErr_Occurred())
+             goto error;
+-        if (0 < signum && signum < NSIG)
+-            err = sigaddset(mask, (int)signum);
+-        else
+-            err = 1;
+-        if (err) {
++        if (0 < signum && signum < NSIG) {
++            /* bpo-33329: ignore sigaddset() return value as it can fail
++             * for some reserved signals, but we want the `range(1, NSIG)`
++             * idiom to allow selecting all valid signals.
++             */
++            (void) sigaddset(mask, (int)signum);
++        }
++        else {
+             PyErr_Format(PyExc_ValueError,
+                          "signal number %ld out of range", signum);
+             goto error;

python3.spec

@@ -14,7 +14,7 @@ URL: https://www.python.org/
 #  WARNING  When rebasing to a new Python version,
 #           remember to update the python3-docs package as well
 Version: %{pybasever}.5
-Release: 3%{?dist}
+Release: 4%{?dist}
 License: Python
 
 
@@ -374,6 +374,12 @@ Patch294: 00294-define-TLS-cipher-suite-on-build-time.patch
 # Fixed upstream: https://bugs.python.org/issue32885
 Patch301: 00301-pathfix-add-n-option-for-no-backup.patch
 
+# 00302 #
+# Fix multiprocessing regression on newer glibcs
+# See: https://bugzilla.redhat.com/show_bug.cgi?id=1569933
+# and: https://bugs.python.org/issue33329
+Patch302: 00302-fix-multiprocessing-regression-on-newer-glibcs.patch
+
 # (New patches go here ^^^)
 #
 # When adding new patches to "python" and "python3" in Fedora, EL, etc.,
@@ -691,6 +697,7 @@ sed -r -i s/'_PIP_VERSION = "[0-9.]+"'/'_PIP_VERSION = "%{pip_version}"'/ Lib/en
 %patch292 -p1
 %patch294 -p1
 %patch301 -p1
+%patch302 -p1
 
 
 # Remove files that should be generated by the build
@@ -1093,9 +1100,6 @@ CheckPython() {
     %ifarch ppc64le
     -x test_buffer \
     %endif
-    -x test_multiprocessing_fork \
-    -x test_multiprocessing_forkserver \
-    -x test_multiprocessing_spawn \
 
   echo FINISHED: CHECKING OF PYTHON FOR CONFIGURATION: $ConfName
 
@@ -1582,6 +1586,11 @@ CheckPython optimized
 # ======================================================
 
 %changelog
+* Mon Apr 23 2018 Miro Hrončok <mhroncok@redhat.com> - 3.6.5-4
+- Fix multiprocessing regression on newer glibcs
+- Enable test_multiprocessing_fork(server) and _spawn again
+Resolves: rhbz#1569933
+
 * Thu Apr 19 2018 Miro Hrončok <mhroncok@redhat.com> - 3.6.5-3
 - Skip test_multiprocessing_fork(server) and _spawn for now