linux-kernel - Re: [PATCH v2 4/6] locking/lockdep: Reuse freed chain

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Message-ID: <20200113155934.GZ2844@hirez.programming.kicks-ass.net>
Date:   Mon, 13 Jan 2020 16:59:34 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH v2 4/6] locking/lockdep: Reuse freed chain_hlocks entries

On Mon, Dec 16, 2019 at 10:15:15AM -0500, Waiman Long wrote:
> An internal nfsd test that ran for more than an hour could cause the
> following message to be displayed.
> 
>   [ 4318.443670] BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!

I'm guessing the pertinent detail you forget to mention here is that
that test re-loads the nfs modules lots of times?