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test-bdrv-drain: Test AIO_WAIT_WHILE() in completion callback 

This is a regression test for a deadlock that occurred in block job
completion callbacks (via job_defer_to_main_loop) because the AioContext
lock was taken twice: once in job_finish_sync() and then again in
job_defer_to_main_loop_bh(). This would cause AIO_WAIT_WHILE() to hang.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Kevin Wolf 2018-09-06 11:58:01 +02:00
parent de0fbe6480
commit ae23dde9dd
1 changed files with 10 additions and 0 deletions
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10
tests/test-bdrv-drain.c
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@ -774,6 +774,15 @@ typedef struct TestBlockJob {
bool should_complete;
} TestBlockJob;
static int test_job_prepare(Job *job)
{
TestBlockJob *s = container_of(job, TestBlockJob, common.job);
/* Provoke an AIO_WAIT_WHILE() call to verify there is no deadlock */
blk_flush(s->common.blk);
return 0;
}
static int coroutine_fn test_job_run(Job *job, Error **errp)
{
TestBlockJob *s = container_of(job, TestBlockJob, common.job);
@ -804,6 +813,7 @@ BlockJobDriver test_job_driver = {
.drain = block_job_drain,
.run = test_job_run,
.complete = test_job_complete,
.prepare = test_job_prepare,
},
};