Re: hmm_test issues with latest mainline

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On 13.10.22 18:54, Vlastimil Babka wrote:
Hi,

I've been trying the hmm_tests as of today's commit:

a185a0995518 ("Merge tag 'linux-kselftest-kunit-6.1-rc1-2' ...)

and run into several issues that seemed worth reporting.

First, it seems the FIXTURE_TEARDOWN(hmm) in
tools/testing/selftests/vm/hmm-tests.c
using ASSERT_EQ(ret, 0); can run into an infinite loop of reporting the
assertion failure. Dunno if it's a kselftests issue or it's a bug to
use asserts in teardown. I hacked it up like this locally to proceed:

--- a/tools/testing/selftests/vm/hmm-tests.c
+++ b/tools/testing/selftests/vm/hmm-tests.c
@@ -154,6 +154,11 @@ FIXTURE_TEARDOWN(hmm)
  {
  	int ret = close(self->fd);
+ if (ret != 0) {
+		fprintf(stderr, "close returned (%d) fd is (%d)\n", ret,self->fd);
+		exit(1);
+	}
+
  	ASSERT_EQ(ret, 0);
  	self->fd = -1;
  }

Next, there are some tests that fail (and thus also trigger the issue above)

#  RUN           hmm.hmm_device_private.exclusive ...
# hmm-tests.c:1702:exclusive:Expected ret (-16) == 0 (0)
close returned (-1) fd is (3)
# exclusive: Test failed at step #1
#          FAIL  hmm.hmm_device_private.exclusive
not ok 20 hmm.hmm_device_private.exclusive
#  RUN           hmm.hmm_device_private.exclusive_mprotect ...
# hmm-tests.c:1756:exclusive_mprotect:Expected ret (-16) == 0 (0)
close returned (-1) fd is (3)
# exclusive_mprotect: Test failed at step #1
#          FAIL  hmm.hmm_device_private.exclusive_mprotect
not ok 21 hmm.hmm_device_private.exclusive_mprotect
#  RUN           hmm.hmm_device_private.exclusive_cow ...
# hmm-tests.c:1809:exclusive_cow:Expected ret (-16) == 0 (0)
close returned (-1) fd is (3)
# exclusive_cow: Test failed at step #1
#          FAIL  hmm.hmm_device_private.exclusive_cow
not ok 22 hmm.hmm_device_private.exclusive_cow



When did that test start failing? Was it still ok for 6.0?

--
Thanks,

David / dhildenb




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