linux-ext4 - Re: RCU locking issues in jbd2_dev_to

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Message-Id: <7A69E96B-0763-4440-BE10-A39B808C44FA@mit.edu>
Date:	Wed, 27 Jul 2011 07:28:27 -0400
From:	Theodore Tso <tytso@....EDU>
To:	NeilBrown <neilb@...e.de>
Cc:	linux-ext4@...r.kernel.org,
	"Paul E.McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: RCU locking issues in jbd2_dev_to_name


On Jul 27, 2011, at 3:41 AM, NeilBrown wrote:

> 
> 
> Hi Ted and all,
> 
> I've been exploring RCU usage in the kernel looking for strange things, and
> jbd2_dev_to_name looks particularly strange.  The following patch explains
> and addresses the issues that I found.  Comments welcome.

Yeah its broken.  But I have patches pending for the merge window that solve
it by nuking the function altogether; the problem is calling a function from
TP_PRINTK causes perf to die on the spot, terminating its tracing.  :-(

- Ted

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