Subject: Re: realtime-preempt 2.6.16-rt7-10 bug?
From: Lee Revell <rlrevell@joe-job.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: "Shayne O'Connor" <machine@machinehasnoagenda.com>,
       linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>, ardour-dev@lists.ardour.org,
       Paul Davis <paul@linuxaudiosystems.com>
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Date: Tue, 28 Mar 2006 17:40:57 -0500
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On Tue, 2006-03-28 at 15:57 -0500, Steven Rostedt wrote:
> On Wed, 2006-03-29 at 02:33 +1100, Shayne O'Connor wrote:
> > i've compiled the 2.6.16 kernel with the realtime-preempt patches, but
> > have run into some problems while using Ardour for realtime audio.
> > Ardour crashes whenever i stop recording, and after running dmesg i'm
> > suspecting a bug in the realtime patch (i've tried rt7 and rt10, both
> > have the same problem):
> > 
> 
> Hmm, this may be a bug in Ardour.  Since it's for realtime audio, I
> assume that it knows about the timeofday hack, which is the only way to
> get this bug.  The user application set itself to be uninterruptible by
> calling gettimeofday with the two pointers and the integer 1.  This sets
> the task's flag to be uninterruptible (PF_NOSCHED).  But then it did a
> write to the file system (ext3) which did a schedule. Thus you got a
> BUG.

Specifically it unlinked a file.

Shayne, is your /tmp a tmpfs or ext3?

Lee

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