linux-kernel - Re: Reminder: 22 open syzbot bugs in perf subsystem

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Message-ID: <20190703113436.GA21672@redhat.com>
Date:   Wed, 3 Jul 2019 13:34:37 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Song Liu <songliubraving@...com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: Reminder: 22 open syzbot bugs in perf subsystem

On 07/02, Eric Biggers wrote:
>
> Even if it's a lockdep false positive you can't ignore it.  People rely on
> lockdep to find bugs, and they will keep sending you bug reports.  So someone
> has to fix something.  Did you see Oleg's suggestion to change mmput() to
> mmput_async() in binder_alloc_free_page()?
> https://marc.info/?l=linux-kernel&m=155119805728815&w=2
> If you believe that is the right fix, I can reassign this report to binder
> subsystem and nag the binder maintainers instead...

Yes, please. To me s/mmput/mmput_async/ looks like the "obviously correct fix",
but of course I don't understand this code and can't test it.

Oleg.