[PATCH v1 6/6] tests/acceptance: pick a random gdb port for reverse debugging

["Alex Bennée" <alex.bennee@linaro.org>]

Currently the test randomly fails if you are using a shared machine
due to contention on the well known port 1234. We can ameliorate this
a bit by picking a random non-ephemeral port although it doesn't
totally avoid the problem. While we could use a totally unique socket
address for debugging it's impossible to probe for gdb support of the
feature which makes this a sub-optimal but less fiddly option.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tests/acceptance/reverse_debugging.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/acceptance/reverse_debugging.py b/tests/acceptance/reverse_debugging.py
index b72fdf6cdc..f2e8245471 100644
--- a/tests/acceptance/reverse_debugging.py
+++ b/tests/acceptance/reverse_debugging.py
@@ -16,6 +16,7 @@ from avocado.utils import gdb
 from avocado.utils import process
 from avocado.utils.path import find_command
 from boot_linux_console import LinuxKernelTest
+from random import randrange
 
 class ReverseDebugging(LinuxKernelTest):
     """
@@ -43,7 +44,8 @@ class ReverseDebugging(LinuxKernelTest):
         else:
             logger.info('replaying the execution...')
             mode = 'replay'
-            vm.add_args('-s', '-S')
+            self.port = randrange(2048, 49152)
+            vm.add_args('-gdb', 'tcp::%d' % (self.port), '-S')
         vm.add_args('-icount', 'shift=%s,rr=%s,rrfile=%s,rrsnapshot=init' %
                     (shift, mode, replay_path),
                     '-net', 'none')
@@ -122,7 +124,7 @@ class ReverseDebugging(LinuxKernelTest):
         # replay and run debug commands
         vm = self.run_vm(False, shift, args, replay_path, image_path)
         logger.info('connecting to gdbstub')
-        g = gdb.GDBRemote('127.0.0.1', 1234, False, False)
+        g = gdb.GDBRemote('127.0.0.1', self.port, False, False)
         g.connect()
         r = g.cmd(b'qSupported')
         if b'qXfer:features:read+' in r:
-- 
2.20.1