netdev - concurrent rhashtable test failure

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Date:   Mon, 24 Oct 2016 14:11:32 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Phil Sutter <phil@....cc>
Cc:     Thomas Graf <tgraf@...g.ch>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>
Subject: concurrent rhashtable test failure

Hi Phil,

On m68k/ARAnyM, test_rhashtable fails with:

    Test failed: thread 0 returned: -4

(-4 = -EINTR)

I traced this back to your commit f4a3e90ba5739cfd ("rhashtable-test: extend
to test concurrency"), which added that part of the test.

Diff of the test output between the failing commit and its parent:

 Running rhashtable test nelem=8, max_size=65536, shrinking=0
 Test 00:
   Adding 50000 keys
   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
   Deleting 50000 keys
-  Duration of test: 1029960000 ns
+  Duration of test: 990000000 ns
 Test 01:
   Adding 50000 keys
   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
   Deleting 50000 keys
-  Duration of test: 990000000 ns
+  Duration of test: 720000000 ns
 Test 02:
   Adding 50000 keys
   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
   Deleting 50000 keys
-  Duration of test: 1130000000 ns
+  Duration of test: 700000000 ns
 Test 03:
   Adding 50000 keys
   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
   Deleting 50000 keys
-  Duration of test: 1080000000 ns
-Average test time: 1057490000
+  Duration of test: 700000000 ns
+Average test time: 777500000
+Testing concurrent rhashtable access from 10 threads
+Test failed: thread 0 returned: -4
+Started 10 threads, 1 failed

Do you have any clue?

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds