Created attachment 282833 [details]
dmesg (5.0.17, G5 11,2)

Created attachment 282835 [details]
dmesg (4.19.44, G5 11,2)

Created attachment 282837 [details]
dmesg (4.14.120, G5 11,2)

Created attachment 282839 [details]
dmesg (4.9.177, G5 11,2)

Created attachment 282841 [details]
kernel .config (5.1.3, G5 11,2)

This appears to be working as expected, which I admit is a little confusing.

The key thing is that at the end you see, eg:

  [    0.179788] Good, all 261 testcases passed! |

See the commit that added the test:

https://git.kernel.org/torvalds/c/e91498589746

  locking/lockdep/selftests: Add mixed read-write ABBA tests

  Currently lockdep has limited support for recursive readers, add a few
  mixed read-write ABBA selftests to show the extend of these
  limitations.

And in the code:

	print_testname("mixed read-lock/lock-write ABBA");
	pr_cont("             |");
	dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
#ifdef CONFIG_PROVE_LOCKING
	/*
	 * Lockdep does indeed fail here, but there's nothing we can do about
	 * that now.  Don't kill lockdep for it.
	 */
	unexpected_testcase_failures--;
#endif

it's the same for sparc64:

`
[    0.000020] PROMLIB: Sun IEEE Boot Prom 'OBP 4.38.12 2018/03/28 14:54'
[    0.000032] PROMLIB: Root node compatible: sun4v
[    0.000080] Linux version 5.2.0-10808-g9637d517347e (mator@ttip) (gcc version 8.3.0 (Debian 8.3.0-7)) #1080 SMP Tue Jul 16 10:46:19 MSK 2019
[    0.000386] printk: bootconsole [earlyprom0] enabled
[    0.000441] ARCH: SUN4V
...
[    0.451068]  memory used by lock dependency info: 3855 kB
[    0.451104]  per task-struct memory footprint: 1920 bytes
[    0.451140] ------------------------
[    0.451167] | Locking API testsuite:
[    0.451194] ----------------------------------------------------------------------------
[    0.451244]                                  | spin |wlock |rlock |mutex | wsem | rsem |
[    0.451294]   --------------------------------------------------------------------------
[    0.451350]                      A-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.454281]                  A-B-B-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.457443]              A-B-B-C-C-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.460744]              A-B-C-A-B-C deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.464032]          A-B-B-C-C-D-D-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.467545]          A-B-C-D-B-D-D-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.471009]          A-B-C-D-B-C-D-A deadlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.474475]                     double unlock:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.477425]                   initialize held:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
[    0.480301]   --------------------------------------------------------------------------
[    0.480352]               recursive read-lock:             |  ok  |             |  ok  |
[    0.481247]            recursive read-lock #2:             |  ok  |             |  ok  |
[    0.482120]             mixed read-write-lock:             |  ok  |             |  ok  |
[    0.482998]             mixed write-read-lock:             |  ok  |             |  ok  |
[    0.483878]   mixed read-lock/lock-write ABBA:             |FAILED|             |  ok  |
[    0.484755]    mixed read-lock/lock-read ABBA:             |  ok  |             |  ok  |
[    0.485676]  mixed write-lock/lock-write ABBA:             |  ok  |             |  ok  |
[    0.486597]   --------------------------------------------------------------------------
`