linux-kernel - Re: mmiotracer hangs the system

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Message-ID: <CAEXux-aMZvkSH5vTeVN420sruhk29Cm0SnSJS0jcsYDKKiV2_g@mail.gmail.com>
Date:	Wed, 3 Aug 2016 20:24:39 +0200
From:	karol herbst <karolherbst@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: mmiotracer hangs the system

hi all,

mhhh exactly this commit fixed mmiotrace for me and a few other
nouveau devs on x86_64.

Also the error log doesn't really show a problem inside the tracer?
Maybe it would be helpful to provide full dmesg in the case of error,
just to rule silly things out.

I will try to figure out how that bug could happen at all.

Greetings

Karol

2016-08-02 18:13 GMT+02:00 Steven Rostedt <rostedt@...dmis.org>:
> On Tue, 2 Aug 2016 19:08:24 +0300
> Andy Shevchenko <andy.shevchenko@...il.com> wrote:
>
>> I don't think so, since linux-next doesn't work until I revert this commit.
>>
>> I can try exactly v4.6 (yep, I tried stable versions, including
>> v4.4.16 that's why all of them failed to me) if you still would like
>> me to do so.
>
> If linux-next doesn't work, then don't bother.
>
> That commit obviously broke something and you'll probably need help
> from Karol to fix it.
>
> Thanks,
>
> -- Steve