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authorStefan Hajnoczi <stefanha@redhat.com>2018-05-08 14:54:35 +0100
committerJeff Cody <jcody@redhat.com>2018-05-16 13:37:17 -0400
commitddf2d98a94c8a98a661a217fb629cfd15f4dcec7 (patch)
tree7778e8d37fdee1e09a7a7517eb19c37090a8d5f0 /tests
parentc416eecea5f3aea863ab8fda5a36a24157b8f704 (diff)
qemu-iotests: reduce chance of races in 185
Commit 8565c3ab537e78f3e69977ec2c609dc9417a806e ("qemu-iotests: fix 185") identified a race condition in a sub-test. Similar issues also affect the other sub-tests. If disk I/O completes quickly, it races with the QMP 'quit' command. This causes spurious test failures because QMP events are emitted in an unpredictable order. This test relies on QEMU internals and there is no QMP API for getting deterministic behavior needed to make this test 100% reliable. At the same time, the test is useful and it would be a shame to remove it. Add sleep 0.5 to reduce the chance of races. This is not a real fix but appears to reduce spurious failures in practice. Cc: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 20180508135436.30140-2-stefanha@redhat.com Reviewed-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Jeff Cody <jcody@redhat.com>
Diffstat (limited to 'tests')
-rwxr-xr-xtests/qemu-iotests/18512
1 files changed, 12 insertions, 0 deletions
diff --git a/tests/qemu-iotests/185 b/tests/qemu-iotests/185
index 298d88d04e..975404c99d 100755
--- a/tests/qemu-iotests/185
+++ b/tests/qemu-iotests/185
@@ -118,6 +118,9 @@ _send_qemu_cmd $h \
'speed': 65536 } }" \
"return"
+# If we don't sleep here 'quit' command races with disk I/O
+sleep 0.5
+
_send_qemu_cmd $h "{ 'execute': 'quit' }" "return"
wait=1 _cleanup_qemu
@@ -137,6 +140,9 @@ _send_qemu_cmd $h \
'speed': 65536 } }" \
"return"
+# If we don't sleep here 'quit' command races with disk I/O
+sleep 0.5
+
_send_qemu_cmd $h "{ 'execute': 'quit' }" "return"
wait=1 _cleanup_qemu
@@ -183,6 +189,9 @@ _send_qemu_cmd $h \
'speed': 65536 } }" \
"return"
+# If we don't sleep here 'quit' command races with disk I/O
+sleep 0.5
+
_send_qemu_cmd $h "{ 'execute': 'quit' }" "return"
wait=1 _cleanup_qemu
@@ -201,6 +210,9 @@ _send_qemu_cmd $h \
'speed': 65536 } }" \
"return"
+# If we don't sleep here 'quit' command races with disk I/O
+sleep 0.5
+
_send_qemu_cmd $h "{ 'execute': 'quit' }" "return"
wait=1 _cleanup_qemu