|
|
ae23c9 |
From ad9c7d63179e24afa5357ada56fccaeab10545c7 Mon Sep 17 00:00:00 2001
|
|
|
ae23c9 |
From: Kevin Wolf <kwolf@redhat.com>
|
|
|
ae23c9 |
Date: Wed, 10 Oct 2018 20:22:08 +0100
|
|
|
ae23c9 |
Subject: [PATCH 42/49] test-bdrv-drain: Test nested poll in
|
|
|
ae23c9 |
bdrv_drain_poll_top_level()
|
|
|
ae23c9 |
|
|
|
ae23c9 |
RH-Author: Kevin Wolf <kwolf@redhat.com>
|
|
|
ae23c9 |
Message-id: <20181010202213.7372-30-kwolf@redhat.com>
|
|
|
ae23c9 |
Patchwork-id: 82618
|
|
|
ae23c9 |
O-Subject: [RHEL-8 qemu-kvm PATCH 39/44] test-bdrv-drain: Test nested poll in bdrv_drain_poll_top_level()
|
|
|
ae23c9 |
Bugzilla: 1637976
|
|
|
ae23c9 |
RH-Acked-by: Max Reitz <mreitz@redhat.com>
|
|
|
ae23c9 |
RH-Acked-by: John Snow <jsnow@redhat.com>
|
|
|
ae23c9 |
RH-Acked-by: Thomas Huth <thuth@redhat.com>
|
|
|
ae23c9 |
|
|
|
ae23c9 |
This is a regression test for a deadlock that could occur in callbacks
|
|
|
ae23c9 |
called from the aio_poll() in bdrv_drain_poll_top_level(). The
|
|
|
ae23c9 |
AioContext lock wasn't released and therefore would be taken a second
|
|
|
ae23c9 |
time in the callback. This would cause a possible AIO_WAIT_WHILE() in
|
|
|
ae23c9 |
the callback to hang.
|
|
|
ae23c9 |
|
|
|
ae23c9 |
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
|
|
|
ae23c9 |
Reviewed-by: Fam Zheng <famz@redhat.com>
|
|
|
ae23c9 |
(cherry picked from commit ecc1a5c790cf2c7732cb9755ca388c2fe108d1a1)
|
|
|
ae23c9 |
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
|
|
|
ae23c9 |
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
|
|
|
ae23c9 |
|
|
|
ae23c9 |
tests/test-bdrv-drain.c | 13 +++++++++++++
|
|
|
ae23c9 |
1 file changed, 13 insertions(+)
|
|
|
ae23c9 |
|
|
|
ae23c9 |
diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c
|
|
|
ae23c9 |
index 05f3b55..f4b57f7 100644
|
|
|
ae23c9 |
|
|
|
ae23c9 |
+++ b/tests/test-bdrv-drain.c
|
|
|
ae23c9 |
@@ -636,6 +636,17 @@ static void test_iothread_aio_cb(void *opaque, int ret)
|
|
|
ae23c9 |
qemu_event_set(&done_event);
|
|
|
ae23c9 |
}
|
|
|
ae23c9 |
|
|
|
ae23c9 |
+static void test_iothread_main_thread_bh(void *opaque)
|
|
|
ae23c9 |
+{
|
|
|
ae23c9 |
+ struct test_iothread_data *data = opaque;
|
|
|
ae23c9 |
+
|
|
|
ae23c9 |
+ /* Test that the AioContext is not yet locked in a random BH that is
|
|
|
ae23c9 |
+ * executed during drain, otherwise this would deadlock. */
|
|
|
ae23c9 |
+ aio_context_acquire(bdrv_get_aio_context(data->bs));
|
|
|
ae23c9 |
+ bdrv_flush(data->bs);
|
|
|
ae23c9 |
+ aio_context_release(bdrv_get_aio_context(data->bs));
|
|
|
ae23c9 |
+}
|
|
|
ae23c9 |
+
|
|
|
ae23c9 |
/*
|
|
|
ae23c9 |
* Starts an AIO request on a BDS that runs in the AioContext of iothread 1.
|
|
|
ae23c9 |
* The request involves a BH on iothread 2 before it can complete.
|
|
|
ae23c9 |
@@ -705,6 +716,8 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread)
|
|
|
ae23c9 |
aio_context_acquire(ctx_a);
|
|
|
ae23c9 |
}
|
|
|
ae23c9 |
|
|
|
ae23c9 |
+ aio_bh_schedule_oneshot(ctx_a, test_iothread_main_thread_bh, &data);
|
|
|
ae23c9 |
+
|
|
|
ae23c9 |
|
|
|
ae23c9 |
* will make sure that it has completed as far as the BDS is concerned,
|
|
|
ae23c9 |
* but the drain in this thread can continue immediately after
|
|
|
ae23c9 |
--
|
|
|
ae23c9 |
1.8.3.1
|
|
|
ae23c9 |
|