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List:       freebsd-hackers
Subject:    Re: dtrace/cyclic deadlock
From:       Artem Belevich <fbsdlist () src ! cx>
Date:       2010-11-30 0:51:50
Message-ID: AANLkTimpveRPuK6AF4ep7mqFn5ZWOdjmiAfz1tnXoC30 () mail ! gmail ! com
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On Fri, Nov 26, 2010 at 1:48 PM, Andriy Gapon <avg@freebsd.org> wrote:
> on 26/11/2010 21:10 Artem Belevich said the following:
>> On Fri, Nov 26, 2010 at 5:54 AM, Andriy Gapon <avg@freebsd.org> wrote:
>>>> I will appreciate reviews and testing.
>>>
>>> Should I wait for any pending comments?
>>> Otherwise I am confident enough in the patch to commit it.
>>
>> Some time back I used to have reproducible crash related to dtrace/cyclic:
>> http://unix.derkeiler.com/Mailing-Lists/FreeBSD/current/2008-10/msg00449.html
>>
>> If you can wait until Tuesday, I'll try to check if the problem is
>> still reproducible and whether your patch fixes it.
>
> Artem,
>
> thanks a lot!
> I am sure in no hurry and I will appreciate your testing!
>
> --
> Andriy Gapon
>

Andriy,

I was able to reproduce the deadlock with hotkernel during buildworld
after only few attempts.

After applying your patch on top of stable/8 r215749 the deadlock
appears to be gone.

--Artem
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