[3.12] gh-110167: Increase support.LOOPBACK_TIMEOUT to 10 seconds (#110413) (#110427)

gh-110167: Increase support.LOOPBACK_TIMEOUT to 10 seconds (#110413)

Increase support.LOOPBACK_TIMEOUT from 5 to 10 seconds. Also increase
the timeout depending on the --timeout option. For example, for a
test timeout of 40 minutes (ARM Raspbian 3.x), use LOOPBACK_TIMEOUT
of 20 seconds instead of 5 seconds before.

(cherry picked from commit 0db2f14)

Author: vstinner

Lib/test/libregrtest/setup.py

@@ -88,16 +88,19 @@ def _test_audit_hook(name, args):
     setup_unraisable_hook()
     setup_threading_excepthook()
 
-    if ns.timeout is not None:
+    timeout = ns.timeout
+    if timeout is not None:
         # For a slow buildbot worker, increase SHORT_TIMEOUT and LONG_TIMEOUT
-        support.SHORT_TIMEOUT = max(support.SHORT_TIMEOUT, ns.timeout / 40)
-        support.LONG_TIMEOUT = max(support.LONG_TIMEOUT, ns.timeout / 4)
+        support.LOOPBACK_TIMEOUT = max(support.LOOPBACK_TIMEOUT, timeout / 120)
+        # don't increase INTERNET_TIMEOUT
+        support.SHORT_TIMEOUT = max(support.SHORT_TIMEOUT, timeout / 40)
+        support.LONG_TIMEOUT = max(support.LONG_TIMEOUT, timeout / 4)
 
         # If --timeout is short: reduce timeouts
-        support.LOOPBACK_TIMEOUT = min(support.LOOPBACK_TIMEOUT, ns.timeout)
-        support.INTERNET_TIMEOUT = min(support.INTERNET_TIMEOUT, ns.timeout)
-        support.SHORT_TIMEOUT = min(support.SHORT_TIMEOUT, ns.timeout)
-        support.LONG_TIMEOUT = min(support.LONG_TIMEOUT, ns.timeout)
+        support.LOOPBACK_TIMEOUT = min(support.LOOPBACK_TIMEOUT, timeout)
+        support.INTERNET_TIMEOUT = min(support.INTERNET_TIMEOUT, timeout)
+        support.SHORT_TIMEOUT = min(support.SHORT_TIMEOUT, timeout)
+        support.LONG_TIMEOUT = min(support.LONG_TIMEOUT, timeout)
 
     if ns.xmlpath:
         from test.support.testresult import RegressionTestResult

Lib/test/support/__init__.py

@@ -74,13 +74,7 @@
 #
 # The timeout should be long enough for connect(), recv() and send() methods
 # of socket.socket.
-LOOPBACK_TIMEOUT = 5.0
-if sys.platform == 'win32' and ' 32 bit (ARM)' in sys.version:
-    # bpo-37553: test_socket.SendfileUsingSendTest is taking longer than 2
-    # seconds on Windows ARM32 buildbot
-    LOOPBACK_TIMEOUT = 10
-elif sys.platform == 'vxworks':
-    LOOPBACK_TIMEOUT = 10
+LOOPBACK_TIMEOUT = 10.0
 
 # Timeout in seconds for network requests going to the internet. The timeout is
 # short enough to prevent a test to wait for too long if the internet request