Re: [Bug #16537] TREE_RCU hangs at boot

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On Mon, Sep 20, 2010 at 11:26:27AM -0700, Paul E. McKenney wrote:
> On Sun, Sep 12, 2010 at 09:08:42PM +0200, Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.34 and 2.6.35.
> > 
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.34 and 2.6.35.  Please verify if it still should
> > be listed and let the tracking team know (either way).
> > 
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=16537
> > Subject		: TREE_RCU hangs at boot
> > Submitter	: Rolf Eike Beer <eike-kernel@xxxxxxxxx>
> > Date		: 2010-08-07 12:18 (37 days old)
> > Handled-By	: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> 
> I cannot reproduce this.  The function that is claimed to hang contains
> only printk()s.  I have asked the guys who can actually reproduce it
> to try a later kernel, and will let you know how this goes.
> 
> If you cannot trust printk(), who can you trust?  ;-)

It turns out that this problem is due to tab processing in the PA-RISC
firmware, which certainly explains my inability to reproduce it.  It
turns out that it is fixed by:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d9b68e5e88248bb24fd4e455588bea1d56108fd6

So we can close this regression.

Many thanks to Guy Martin <gmsoft@xxxxxxxxxxxx> for much help with
this!!!

							Thanx, Paul
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