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From: Ngie Cooper <yaneurabeya@gmail.com>
Date: Thu, 22 Sep 2016 18:50:52 -0700
Message-ID: <CAGHfRMCoEhaCY5hVg2akV4RjV+_3jeYOCPvni+G1-tiVpLtnNQ@mail.gmail.com>
Subject: Re: svn commit: r306220 - head/sys/cddl/dev/systrace
To: Mark Johnston <markj@freebsd.org>
Cc: "src-committers@freebsd.org" <src-committers@freebsd.org>, 
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On Thu, Sep 22, 2016 at 4:22 PM, Mark Johnston <markj@freebsd.org> wrote:
> Author: markj
> Date: Thu Sep 22 23:22:53 2016
> New Revision: 306220
> URL: https://svnweb.freebsd.org/changeset/base/306220
>
> Log:
>   Re-check the systrace probe ID before calling dtrace_probe().
>
>   Otherwise there exists a narrow window during which a syscall probe can be
>   disabled and cause a concurrently-running thread to call dtrace_probe()
>   with an invalid probe ID.
>
>   Reported by:  ngie
>   MFC after:    1 week
>   Sponsored by: Dell EMC Isilon

Thanks Mark :)!