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[Qemu-devel] [PATCH 2/3] iotests: Bind qemu-nbd to localhost in 147

From: Max Reitz
Subject: [Qemu-devel] [PATCH 2/3] iotests: Bind qemu-nbd to localhost in 147
Date: Sat, 22 Dec 2018 00:47:49 +0100

By default, qemu-nbd binds to  However, we then proceed to
connect to "localhost".  Usually, this works out fine; but if this test
is run concurrently, some other test function may have bound a different
server to ::1 (on the same port -- you can bind different serves to the
same port, as long as one is on IPv4 and the other on IPv6).

So running qemu-nbd works, it can bind to  But
potentially a concurrent test has successfully taken [::1]:NBD_PORT.  In
this case, trying to connect to "localhost" will lead us to the IPv6
instance, where we do not want to end up.

Fix this by just binding to "localhost".  This will make qemu-nbd error
out immediately and not give us cryptic errors later.

(Also, it will allow us to just try a different port as of a future

Signed-off-by: Max Reitz <address@hidden>
 tests/qemu-iotests/147 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/qemu-iotests/147 b/tests/qemu-iotests/147
index 05b374b7d3..3e10a9969e 100755
--- a/tests/qemu-iotests/147
+++ b/tests/qemu-iotests/147
@@ -92,7 +92,7 @@ class QemuNBD(NBDBlockdevAddBase):
         self.assertEqual(qemu_nbd('-f', imgfmt, test_img, *args), 0)
     def test_inet(self):
-        self._server_up('-p', str(NBD_PORT))
+        self._server_up('-b', 'localhost', '-p', str(NBD_PORT))
         address = { 'type': 'inet',
                     'data': {
                         'host': 'localhost',

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