Re: [tip: locking/core] lockdep: Fix usage_traceoverflow

Peter Zijlstra
2020-10-27T16:06:38Z

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?