linux-kernel - Re: commit 554f76962d3a6eb5110415f1591aca83f96a84ae hangs USB for vmware 7.0.1

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Message-ID: <alpine.LFD.2.00.1003051438280.3906@localhost.localdomain>
Date:	Fri, 5 Mar 2010 14:40:33 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jeff Chua <jeff.tw.chua@...il.com>
cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Oliver Neukum <oliver@...kum.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Frederic Weisbecker <fweisbec@...il.com>, petr@...are.com,
	Eli Collins <ecollins@...are.com>
Subject: Re: commit 554f76962d3a6eb5110415f1591aca83f96a84ae hangs USB for
 vmware 7.0.1



On Sat, 6 Mar 2010, Jeff Chua wrote:
> 
> Linux version v2.6.33-5399-gcc7889f with reiser3 and vmware-7.0.1
> 
> Starting vmware just hang even before displaying the main GUI. Reverting
> 554f76962d3a6eb5110415f1591aca83f96a84ae solves the problem.
> 
> It seems vmware is trying to access the USB but this commit blocks it.
> 
> So, is this a vmware problem or shall this be reverted?

It's almost certainly a deadlock through some path that wasn't tested.

Can you enable lockdep on that kernel when you run vmware, which should 
give us a nice callchain etc, and hopefully make it very obvious what goes 
on.

Reverting it is obviously an option, but with some more info maybe there's 
a better solution.

(It may be that the deadlock is obvious to Oliver/Greg even without any 
lockdep chains, of course, but still worth trying, I suspect)

		Linus
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