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From 882087e49dc3c3286db14e7c98f3dc557a7af235 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Tue, 26 Jun 2018 09:47:45 +0200
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Subject: [PATCH 077/268] qemu-iotests: reduce chance of races in 185
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20180626094856.6924-3-kwolf@redhat.com>
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Patchwork-id: 81061
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH v2 02/73] qemu-iotests: reduce chance of races in 185
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Bugzilla: 1513543
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Commit 8565c3ab537e78f3e69977ec2c609dc9417a806e ("qemu-iotests: fix
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185") identified a race condition in a sub-test.
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Similar issues also affect the other sub-tests. If disk I/O completes
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quickly, it races with the QMP 'quit' command. This causes spurious
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test failures because QMP events are emitted in an unpredictable order.
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This test relies on QEMU internals and there is no QMP API for getting
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deterministic behavior needed to make this test 100% reliable. At the
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same time, the test is useful and it would be a shame to remove it.
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Add sleep 0.5 to reduce the chance of races. This is not a real fix but
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appears to reduce spurious failures in practice.
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Cc: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Message-id: 20180508135436.30140-2-stefanha@redhat.com
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Reviewed-by: Jeff Cody <jcody@redhat.com>
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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(cherry picked from commit ddf2d98a94c8a98a661a217fb629cfd15f4dcec7)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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tests/qemu-iotests/185 | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/tests/qemu-iotests/185 b/tests/qemu-iotests/185
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index 298d88d..975404c 100755
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--- a/tests/qemu-iotests/185
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+++ b/tests/qemu-iotests/185
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@@ -118,6 +118,9 @@ _send_qemu_cmd $h \
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'speed': 65536 } }" \
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"return"
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+# If we don't sleep here 'quit' command races with disk I/O
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+sleep 0.5
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+
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_send_qemu_cmd $h "{ 'execute': 'quit' }" "return"
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wait=1 _cleanup_qemu
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@@ -137,6 +140,9 @@ _send_qemu_cmd $h \
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'speed': 65536 } }" \
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"return"
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+# If we don't sleep here 'quit' command races with disk I/O
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+sleep 0.5
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+
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_send_qemu_cmd $h "{ 'execute': 'quit' }" "return"
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wait=1 _cleanup_qemu
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@@ -183,6 +189,9 @@ _send_qemu_cmd $h \
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'speed': 65536 } }" \
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"return"
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+# If we don't sleep here 'quit' command races with disk I/O
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+sleep 0.5
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+
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_send_qemu_cmd $h "{ 'execute': 'quit' }" "return"
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wait=1 _cleanup_qemu
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@@ -201,6 +210,9 @@ _send_qemu_cmd $h \
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'speed': 65536 } }" \
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"return"
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+# If we don't sleep here 'quit' command races with disk I/O
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+sleep 0.5
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+
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_send_qemu_cmd $h "{ 'execute': 'quit' }" "return"
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wait=1 _cleanup_qemu
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--
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1.8.3.1
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