netdev - Re: rhashtable - rhashtable_insert

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Date:	Sat, 4 Jun 2016 09:35:27 +0200
From:	Phil Sutter <phil@....cc>
To:	Helge Deller <deller@....de>
Cc:	netdev@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: rhashtable - rhashtable_insert_fast failed

[Cc'ing other interested parties, therefore full-quoting.]

Hi Helge,

On Fri, Jun 03, 2016 at 10:22:26PM +0200, Helge Deller wrote:
> Hi Phil,
> 
> I'm testing 4.7.0-rc1-64bit on a parisc/hppa machine and get
> those message with CONFIG_TEST_RHASHTABLE=y.
> 
> Is this expected/normal ?

No, this shouldn't happen. Can you possibly bisect the issue?

Cheers, Phil

> 
> Helge
> 
> [   11.004021] Running rhashtable test nelem=8, max_size=0, shrinking=0
> [   11.060013] Test 00:
> [   11.181391]   Adding 50000 keys
> [   11.299533] Info: encountered resize
> [   11.344499] Info: encountered resize
> [   11.392971] Info: encountered resize
> [   11.447632]   Traversal complete: counted=50628, nelems=50000, entries=50000, table-jumps=3
> [   11.556024] Test failed: Total count mismatch ^^^
> [   11.647150]   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
> [   11.760022]   Deleting 50000 keys
> [   11.822941]   Duration of test: 596000000 ns
> [   11.876057] Test 01:
> [   11.919907]   Adding 50000 keys
> [   12.024027] Info: encountered resize
> [   12.024767] Info: encountered resize
> [   12.072981] Info: encountered resize
> [   12.169265]   Traversal complete: counted=53763, nelems=50000, entries=50000, table-jumps=3
> [   12.172021] Test failed: Total count mismatch ^^^
> [   12.377004]   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
> [   12.380022]   Deleting 50000 keys
> [   12.552900]   Duration of test: 596000000 ns
> [   12.556069] Test 02:
> [   12.650017]   Adding 50000 keys
> [   12.746381] Info: encountered resize
> [   12.792486] Info: encountered resize
> [   12.840977] Info: encountered resize
> [   12.894604]   Traversal complete: counted=52831, nelems=50000, entries=50000, table-jumps=3
> [   13.004025] Test failed: Total count mismatch ^^^
> [   13.094046]   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
> [   13.204022]   Deleting 50000 keys
> [   13.269555]   Duration of test: 576000000 ns
> [   13.324062] Test 03:
> [   13.366586]   Adding 50000 keys
> [   13.466624] Info: encountered resize
> [   13.468255] Info: encountered resize
> [   13.516485] Info: encountered resize
> [   13.564977] Info: encountered resize
> [   13.662159]   Traversal complete: counted=52381, nelems=50000, entries=50000, table-jumps=4
> [   13.664022] Test failed: Total count mismatch ^^^
> [   13.870009]   Traversal complete: counted=50000, nelems=50000, entries=50000, table-jumps=0
> [   13.876015]   Deleting 50000 keys
> [   14.045912]   Duration of test: 640000000 ns
> [   14.048065] Average test time: 602000000
> [   14.104017] Testing concurrent rhashtable access from 10 threads
> [   14.537134]   thread[6]: rhashtable_insert_fast failed
> [   14.540722]   thread[5]: rhashtable_insert_fast failed
> [   14.540747]   thread[1]: rhashtable_insert_fast failed
> [   14.540757]   thread[3]: rhashtable_insert_fast failed
> [   14.540767]   thread[0]: rhashtable_insert_fast failed
> [   14.540862]   thread[7]: rhashtable_insert_fast failed
> [   14.540873]   thread[9]: rhashtable_insert_fast failed
> [   14.540874]   thread[2]: rhashtable_insert_fast failed
> [   14.540874]   thread[4]: rhashtable_insert_fast failed
> [   14.676061] Test failed: thread 0 returned: -12
> [   14.676102] Test failed: thread 1 returned: -12
> [   14.676120]   thread[8]: rhashtable_insert_fast failed
> [   14.676153] Test failed: thread 2 returned: -12
> [   14.676176] Test failed: thread 3 returned: -12
> [   14.676199] Test failed: thread 4 returned: -12
> [   14.676224] Test failed: thread 5 returned: -12
> [   15.516892] Test failed: thread 6 returned: -12
> [   15.644271] Test failed: thread 7 returned: -12
> [   15.708319] Test failed: thread 8 returned: -12
> [   15.772074] Test failed: thread 9 returned: -12
> [   15.832013] Started 10 threads, 10 failed