linux-kernel - Re: [PATCH 1/3] lockdep: Move lock events under lockdep recursion protection

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Message-ID: <1268235925.5279.2.camel@twins>
Date:	Wed, 10 Mar 2010 16:45:25 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>, Greg KH <gregkh@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH 1/3] lockdep: Move lock events under lockdep recursion
 protection

On Wed, 2010-03-10 at 01:05 +0100, Frederic Weisbecker wrote:
> On Tue, Mar 09, 2010 at 09:35:37AM +0100, Jens Axboe wrote:
> > Which, btw, throws a new lockdep warning fest:
> > 
> > [   42.247718] scsi7 : ioc0: LSISAS1068E B3, FwRev=011b0300h,
> Ports=1, MaxQ=483, IRQ=26
> > [   42.281125] BUG: key ffff880c7cb75250 not in .data!
> > [   42.288346] ------------[ cut here ]------------
> > [   42.294490] WARNING: at kernel/lockdep.c:2706 lockdep_init_map
> +0x545/0x5f0()
> > [   42.304013] Hardware name: QSSC-S4R
> > [   42.309674] Modules linked in: hid_apple usbhid ehci_hcd uhci_hcd
> usbcore nls_base mptsas(+) mptscsih mptbase scsi_transport_sas igb sg
> sr_mod cdrom
> > [   42.332072] Pid: 5197, comm: modprobe Not tainted 2.6.34-rc1 #176
> > [   42.340597] Call Trace:
> > [   42.345335]  [<ffffffff8107fb8d>] ? is_module_address+0x2d/0x60
> > [   42.353670]  [<ffffffff81074aa5>] ? lockdep_init_map+0x545/0x5f0
> > [   42.362154]  [<ffffffff81044648>] warn_slowpath_common+0x78/0xd0
> > [   42.371913]  [<ffffffff810446af>] warn_slowpath_null+0xf/0x20
> > [   42.380109]  [<ffffffff81074aa5>] lockdep_init_map+0x545/0x5f0
> 
> 
> 
> This doesn't look related to my patch, it also happen in -rc1 right?


The per-cpu changes broke lockdep, Tejun already posted patches for
this:

http://lkml.org/lkml/2010/3/10/76
http://lkml.org/lkml/2010/3/10/79


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