Re: [Bug #16537] TREE_RCU hangs at boot

Paul E. McKenney
2010-09-21T18:59:53Z

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@sf-tec.de>
> > Date : 2010-08-07 12:18 (37 days old)
> > Handled-By : Paul E. McKenney <paulmck@linux.vnet.ibm.com>
>
> 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@tuxicoman.be> for much help with
this!!!

Thanx, Paul