linux-kernel - Re: Regression in RCU subsystem in latest mainline kernel

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Message-ID: <20130614122800.GL5146@linux.vnet.ibm.com>
Date:	Fri, 14 Jun 2013 05:28:00 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Rojhalat Ibrahim <imr@...chenk.de>
Cc:	linux-kernel@...r.kernel.org, rostedt@...dmis.org
Subject: Re: Regression in RCU subsystem in latest mainline kernel

On Fri, Jun 14, 2013 at 01:47:00PM +0200, Rojhalat Ibrahim wrote:
> Hi,
> 
> the current mainline kernel from git reproducibly hangs on my Freescale 
> PowerPC P5020DS development system. Most of the time the hang occurs during 
> boot (kernel just stops booting, system hangs), sometimes shortly after 
> booting (system hangs, no message). Very often booting stops at the 
> initialization of the Intel PRO 1000 PCIe network device (e1000e).
> 
> I used git bisect and arrived at this commit:
> 
> 016a8d5be6ddcc72ef0432d82d9f6fa34f61b907
> rcu: Don't call wakeup() with rcu_node structure ->lock held
> 
> With versions before that commit the system runs normally.

Odd, given that this fix was intended to prevent hangs.  Could you
please send your .config?

							Thanx, Paul

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