linux-kernel - Re: [rhashtable] [ INFO: suspicious RCU usage. ]

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Message-ID: <20150402073356.GC19425@casper.infradead.org>
Date:	Thu, 2 Apr 2015 08:33:56 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Fengguang Wu <fengguang.wu@...el.com>, LKP <lkp@...org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [rhashtable] [ INFO: suspicious RCU usage. ]

On 04/02/15 at 12:29pm, Herbert Xu wrote:
> 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>

Acked-by: Thomas Graf <tgraf@...g.ch>

Had the same fix queued up in an upcoming series ;-)
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