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test/bdev: Add a unit test to expose a race condition

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There is a race condition with the following sequence:

spdk_bdev_open()
spdk_bdev_unregister() <-- starts deferred message
spdk_bdev_close()
deferred message runs, crashes

Change-Id: I81fbced0849949cfb2dae5a7cc6f60c9685a8885
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/424739
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
Ben Walker 2018-09-05 16:20:22 -07:00 committed by Jim Harris
parent 8f64db180e
commit a7a2e2721a
1 changed files with 60 additions and 0 deletions
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60
test/unit/lib/bdev/mt/bdev.c/bdev_ut.c
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@ -328,6 +328,65 @@ basic(void)
CU_ASSERT(g_fini_start_called == true);
}
static void
_bdev_removed(void *done)
{
*(bool *)done = true;
}
static void
_bdev_unregistered(void *done, int rc)
{
CU_ASSERT(rc == 0);
*(bool *)done = true;
}
static void
unregister_and_close(void)
{
bool done, remove_notify;
struct spdk_bdev_desc *desc;
setup_test();
set_thread(0);
/* setup_test() automatically opens the bdev,
* but this test needs to do that in a different
* way. */
spdk_bdev_close(g_desc);
poll_threads();
remove_notify = false;
spdk_bdev_open(&g_bdev.bdev, true, _bdev_removed, &remove_notify, &desc);
CU_ASSERT(remove_notify == false);
CU_ASSERT(desc != NULL);
/* There is an open descriptor on the device. Unregister it,
* which can't proceed until the descriptor is closed. */
done = false;
spdk_bdev_unregister(&g_bdev.bdev, _bdev_unregistered, &done);
/* No polling has occurred, so neither of these should execute */
CU_ASSERT(remove_notify == false);
CU_ASSERT(done == false);
/* Prior to the unregister completing, close the descriptor */
spdk_bdev_close(desc);
/* Poll the threads to allow all events to be processed */
poll_threads();
/* Remove notify should not have been called because the
* descriptor is already closed. */
CU_ASSERT(remove_notify == false);
/* The unregister should have completed */
CU_ASSERT(done == true);
spdk_bdev_finish(finish_cb, NULL);
poll_threads();
free_threads();
}
static void
reset_done(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
{
@ -1245,6 +1304,7 @@ main(int argc, char **argv)
if (
CU_add_test(suite, "basic", basic) == NULL ||
CU_add_test(suite, "unregister_and_close", unregister_and_close) == NULL ||
CU_add_test(suite, "basic_qos", basic_qos) == NULL ||
CU_add_test(suite, "put_channel_during_reset", put_channel_during_reset) == NULL ||
CU_add_test(suite, "aborted_reset", aborted_reset) == NULL ||