linux-kernel - Re: [PATCH] tracing: use raw spinlocks instead of spinlocks

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Message-ID: <c62985530811031803o6909518ax137d42189dcff0de@mail.gmail.com>
Date:	Tue, 4 Nov 2008 03:03:27 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing: use raw spinlocks instead of spinlocks

2008/11/3 Ingo Molnar <mingo@...e.hu>:
> Frederic, do you have trouble finding the source of the deadlock? In
> theory the NMI watchdog should be able to punch through it. (if not
> then we need to improve things so that it can)

Ok...actually I still have a deadlock. Or it seems to. I launch the
return tracer and then...the system
can block after several seconds, typically after I try to write some
characters on the terminal.

It happens more easily on SMP.

I enabled all I could for lock debugging, but I don't have any errors printed...
Lockdep uses an NMI wachdog?
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