linux-kernel - Re: mutex

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Message-Id: <200804092240.26623.rjw@sisk.pl>
Date:	Wed, 9 Apr 2008 22:40:25 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Justin Mattock" <justinmattock@...il.com>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: mutex_unlock

On Wednesday, 9 of April 2008, Justin Mattock wrote:
> Hello with testing out git(very cool); my first test was with
> 2.6.25-rc8-00194-g4cac04d ran vary smoothly;
> then I decided to pull the latest git (2.6.25-rc8-00208-g7180c4c)and
> see what I might find.
> upon reboot the system starts up giving me this:
> 
> Starting up
> Decompressing Linux Done
> Booting the kernel
> __   <-------blinking
> 
> I waited a few seconds or minutes but nothing;
> after reading earlier posts about something with a mutex_unlock maybe
> this was what I was experiencing.
> when loading a live cd and recompiling the same kernel, I noticed
> under kernel hacking;
> 
> RT Mutex debugging
> Built in scriptable tester for rt-mutexes
> Spinlock and rw-lock debugging
> Mutex debugging basic checks
> Lock debugging detect incorrect freeing of live locks
> Lock debugging prove locking correctness
> lock usage statistics
> Lock dependency engine debugging
> spinlock debugging sleep-inside-spinlock checking
> Locking API boot-time self-tests
> 
> With not knowing what I was doing I chose yes to all of these options,
> then reboot -f,
> The system booted up properly,
> 
> Is there a way where I can find out if this was what was going on?
> could this be something different?

Hm, interesting.

It looks like our locking debugging code may hide some issues ...

Thanks,
Rafael
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