Re: [lockdep] b09be676e0 BUG: unable to handle kernel NULL pointer dereference at 000001f2

From: Ingo Molnar
Date: Wed Oct 04 2017 - 06:31:29 EST

* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> On Tue, Oct 03, 2017 at 07:18:24PM +0200, Ingo Molnar wrote:
> > Yes, I'll do that tomorrow. I was always a bit unhappy about cross-release,
> > because it breaks the 'owner task owns the lock' model.
> Still, you can get real deadlocks with completions...
> > Plus I don't think we found that many real bugs with it
> Every bug found is one less bug. It did find a few.

Certainly, but the total work saved by finding bugs should be balanced against the
additional fragility of lockdep and the ongoing maintenance cost.