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From c6dae9ed2996e40bfdcf6c680bd481c43182fb3d Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Fri, 14 Sep 2018 10:55:30 +0200
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Subject: [PATCH 39/49] test-bdrv-drain: Test AIO_WAIT_WHILE() in completion
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callback
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20180914105540.18077-33-kwolf@redhat.com>
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Patchwork-id: 82181
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH 32/42] test-bdrv-drain: Test AIO_WAIT_WHILE() in completion callback
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Bugzilla: 1601212
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RH-Acked-by: John Snow <jsnow@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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This is a regression test for a deadlock that occurred in block job
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completion callbacks (via job_defer_to_main_loop) because the AioContext
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lock was taken twice: once in job_finish_sync() and then again in
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job_defer_to_main_loop_bh(). This would cause AIO_WAIT_WHILE() to hang.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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tests/test-bdrv-drain.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c
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index 3cf3ba3..05f3b55 100644
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--- a/tests/test-bdrv-drain.c
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+++ b/tests/test-bdrv-drain.c
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@@ -774,6 +774,15 @@ typedef struct TestBlockJob {
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bool should_complete;
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} TestBlockJob;
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+static int test_job_prepare(Job *job)
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+{
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+ TestBlockJob *s = container_of(job, TestBlockJob, common.job);
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+
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+ /* Provoke an AIO_WAIT_WHILE() call to verify there is no deadlock */
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+ blk_flush(s->common.blk);
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+ return 0;
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+}
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+
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static int coroutine_fn test_job_run(Job *job, Error **errp)
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{
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TestBlockJob *s = container_of(job, TestBlockJob, common.job);
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@@ -804,6 +813,7 @@ BlockJobDriver test_job_driver = {
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.drain = block_job_drain,
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.run = test_job_run,
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.complete = test_job_complete,
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+ .prepare = test_job_prepare,
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},
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};
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--
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1.8.3.1
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