Messages in this thread | | | Subject | Re: [PATCH 3/4] locking/ww_mutex: Treat ww_mutex_lock() like a trylock | From | Waiman Long <> | Date | Wed, 17 Mar 2021 22:54:17 -0400 |
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On 3/17/21 10:24 PM, Boqun Feng wrote: > Hi Waiman, > > Just a question out of curiosity: how does this problem hide so long? > ;-) Because IIUC, both locktorture and ww_mutex_lock have been there for > a while, so why didn't we spot this earlier? > > I ask just to make sure we don't introduce the problem because of some > subtle problems in lock(dep). > You have to explicitly specify ww_mutex in the locktorture module parameter to run the test. ww_mutex is usually not the intended target of testing as there aren't that many places that use it. Even if someone run it, it probably is not on a debug kernel.
Our QA people try to run locktorture on ww_mutex and discover that.
Cheers, Longman
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