linux-kernel - Re: [tip: locking/core] lockdep: Fix usage

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Message-ID: <20201027154533.GB2611@hirez.programming.kicks-ass.net>
Date:   Tue, 27 Oct 2020 16:45:33 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
        tip-bot2 for Peter Zijlstra <tip-bot2@...utronix.de>,
        Qian Cai <cai@...hat.com>, x86 <x86@...nel.org>
Subject: Re: [tip: locking/core] lockdep: Fix usage_traceoverflow

On Tue, Oct 27, 2020 at 01:29:10PM +0000, Chris Wilson wrote:

> <4> [304.908891] hm#2, depth: 6 [6], 3425cfea6ff31f7f != 547d92e9ec2ab9af
> <4> [304.908897] WARNING: CPU: 0 PID: 5658 at kernel/locking/lockdep.c:3679 check_chain_key+0x1a4/0x1f0

Urgh, I don't think I've _ever_ seen that warning trigger.

The comments that go with it suggest memory corruption is the most
likely trigger of it. Is it easy to trigger?