linux-kernel - Re: [PATCH 4/4] lockdep: Fix workqueue crossrelease annotation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 1 Sep 2017 14:38:56 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     mingo@...nel.org, tj@...nel.org, boqun.feng@...il.com,
        david@...morbit.com, johannes@...solutions.net, oleg@...hat.com,
        linux-kernel@...r.kernel.org, kernel-team@....com
Subject: Re: [PATCH 4/4] lockdep: Fix workqueue crossrelease annotation

On Fri, Sep 01, 2017 at 07:16:29PM +0900, Byungchul Park wrote:

> It would be gone _only_ at the time the history overrun, and then it
> will be built again. So, you are wrong.

How will it ever be build again? You only ever spawn the worker thread
_ONCE_, then it runs lots and lots of works.

We _could_ go fix it, but I really don't see it being worth the time and
effort, its a few isolated locks inside the kthread/workqueue code.