netdev - Re: [rhashtable] [ INFO: suspicious RCU usage. ]

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Date:	Thu, 2 Apr 2015 12:29:50 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	LKP <lkp@...org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Thomas Graf <tgraf@...g.ch>
Subject: Re: [rhashtable] [ INFO: suspicious RCU usage. ]

On Thu, Apr 02, 2015 at 12:11:35PM +0800, Fengguang Wu wrote:
> 
> Yes it is contained in next-20150401 which is bad:
> 
> # extra tests on tree/branch next/master
> git bisect  bad e954104e2b634b42811dad8d502cbf240f206df2  # 21:22      0-     60  Add linux-next specific files for 20150401
> 
> The dmesg there is
> 
> [    1.149409] test_firmware: interface ready
> [    1.150293] Running resizable hashtable tests...
> [    1.151209]   Adding 2048 keys
> [    1.152069] ------------[ cut here ]------------
> [    1.152978] WARNING: CPU: 0 PID: 1 at lib/rhashtable.c:409 rhashtable_insert_rehash+0x9d/0x1d0()

I see.  This is actually a completely different problem.

---8<---
test_rhashtable: Remove bogus max_size setting

Now that resizing is completely automatic, we need to remove
the max_size setting or the test will fail.

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c
index a42a0d4..b295754 100644
--- a/lib/test_rhashtable.c
+++ b/lib/test_rhashtable.c
@@ -44,7 +44,6 @@ static const struct rhashtable_params test_rht_params = {
 	.key_offset = offsetof(struct test_obj, value),
 	.key_len = sizeof(int),
 	.hashfn = jhash,
-	.max_size = 2, /* we expand/shrink manually here */
 	.nulls_base = (3U << RHT_BASE_SHIFT),
 };
 
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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