Message ID | 20181001151053.7046-1-kwolf@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Series | tests/test-bdrv-drain: Fix too late qemu_event_reset() | expand |
On 01.10.18 17:10, Kevin Wolf wrote: > qemu_event_reset() must be called before the AIO request in a different > iothread is submitted. Otherwise the request could be completed before > we do the qemu_event_reset() and the test would hang in > qemu_event_wait(). > > Signed-off-by: Kevin Wolf <kwolf@redhat.com> > --- > tests/test-bdrv-drain.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) Reviewed-by: Max Reitz <mreitz@redhat.com> Tested-by: Max Reitz <mreitz@redhat.com> (I still got the same hang as the one you just reported, though -- but it happens just very rarely, so it's definitely better.)
diff --git a/tests/test-bdrv-drain.c b/tests/test-bdrv-drain.c index c9f29c8b10..ee1740ff06 100644 --- a/tests/test-bdrv-drain.c +++ b/tests/test-bdrv-drain.c @@ -694,6 +694,8 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread) s->bh_indirection_ctx = ctx_b; aio_ret = -EINPROGRESS; + qemu_event_reset(&done_event); + if (drain_thread == 0) { acb = blk_aio_preadv(blk, 0, &qiov, 0, test_iothread_aio_cb, &aio_ret); } else { @@ -723,7 +725,6 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread) * but the drain in this thread can continue immediately after * bdrv_dec_in_flight() and aio_ret might be assigned only slightly * later. */ - qemu_event_reset(&done_event); do_drain_begin(drain_type, bs); g_assert_cmpint(bs->in_flight, ==, 0); @@ -743,7 +744,6 @@ static void test_iothread_common(enum drain_type drain_type, int drain_thread) } break; case 1: - qemu_event_reset(&done_event); aio_bh_schedule_oneshot(ctx_a, test_iothread_drain_entry, &data); qemu_event_wait(&done_event); break;
qemu_event_reset() must be called before the AIO request in a different iothread is submitted. Otherwise the request could be completed before we do the qemu_event_reset() and the test would hang in qemu_event_wait(). Signed-off-by: Kevin Wolf <kwolf@redhat.com> --- tests/test-bdrv-drain.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)