linux-kernel - Re: linux-next: zillions of lockdep whinges in include/net/sock.h:1408

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Message-ID: <176911.1461527778@turing-police.cc.vt.edu>
Date:	Sun, 24 Apr 2016 15:56:18 -0400
From:	Valdis.Kletnieks@...edu
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: linux-next: zillions of lockdep whinges in include/net/sock.h:1408

On Sun, 24 Apr 2016 12:46:42 -0700, Eric Dumazet said:

> >>> +	return !debug_locks ||
> >>> +	       lockdep_is_held(&sk->sk_lock) ||

> Issue here is that once lockdep detected a problem (not necessarily in
> net/ tree btw), your helper always 'detect' a problem, since lockdep
> automatically disables itself.

"D'Oh!" -- H. Simpson

I thought this patch looked suspect, but couldn't put my finger on it. The
reason why I got like 41,000 of them is because I built a kernel that has
lockdep enabled, but I have an out-of-tree module that doesn't init something,
so I get this:

[   48.898156] INFO: trying to register non-static key.
[   48.898157] the code is fine but needs lockdep annotation.
[   48.898157] turning off the locking correctness validator.

After which point, even with this patch, every time through it's still going to
explode.

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