linux-ext4 - Re: ext4 lockdep splat with v4.9-rc1

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Message-ID: <20161021100525.GA28926@quack2.suse.cz>
Date:   Fri, 21 Oct 2016 12:05:25 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>
Subject: Re: ext4 lockdep splat with v4.9-rc1

On Thu 20-10-16 20:06:16, Ross Zwisler wrote:
> In my DAX PMD regression testing I hit the lockdep splat at the end of this
> mail.  I've tried to reproduce it multiple times, but haven't been able to.
> I'm hoping that the lockdep splat contains enough information by itself to be
> useful.
> 
> This testing was done with v8 of my DAX PMD series, but I don't think my
> series modifies any of the locks in the splat so I think the problem should
> exist with v4.9-rc1 as well.

Thanks for report. Yes, I'm aware of the problem and it started happening
after update of lockdep instrumentation in the fs freezing code. I didn't
get to fixing it yet.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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