linux-kernel - Re: waitqueue lockdep 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]

Message-ID: <1a5d4610-b84e-ba29-b5bb-b80e19fc17b7@akamai.com>
Date:   Tue, 5 Dec 2017 10:24:34 -0500
From:   Jason Baron <jbaron@...mai.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dave@...olabs.net>
Subject: Re: waitqueue lockdep annotation

On 12/01/2017 06:03 PM, Christoph Hellwig wrote:
> On Fri, Dec 01, 2017 at 05:34:50PM -0500, Jason Baron wrote:
>> hmmm...I'm not sure how this suggestion would change the locking rules
>> from what we currently have. Right now, we use ep->lock, if we remove
>> that and use ep->wq->lock instead, there is just a 1-to-1 mapping there
>> that has not changed, since ep->wq->lock currently is completely not
>> being used.
> 
> True.  The patch below survives the amazing complex booting and starting
> systemd with lockdep enabled test.  Do we have something resembling a
> epoll test suite?
>

I don't think we have any in the kernel tree proper (other than some
selftests using epoll) but there are tests in ltp and some performance
tests such as:

http://linux-scalability.org/epoll/epoll-test.c
http://www.xmailserver.org/linux-patches/pipetest.c

Thanks,

-Jason