linux-kernel - Re: shm updates broke UML

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Date:	Thu, 4 Aug 2011 13:04:40 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Marc Zyngier <marc.zyngier@....com>,
	Richard Weinberger <richard@....at>,
	serge.hallyn@...onical.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: shm updates broke UML

issue solved for the UML, tested linux-v3.0-7347-g288d5ab whcih works fine.

BTW is there a special commit id dealing with this bug or was it solved as a 
side effect of another commit ?

Vasiliy Kulikov wrote at 19:24:52
> On Mon, Aug 01, 2011 at 19:19 +0200, Marc Zyngier wrote:
> > Here you go (sorry about the line wrapping, damned webmail...):
> Thank you!  Now I see that the problem is rw_mutex is not initialized:
> 
> 	down_write(&shm_ids(ns).rw_mutex);
> 
> void __sched __down_write_nested(struct rw_semaphore *sem, int subclass)
> {
>     ...
> 	if (sem->activity == 0 && list_empty(&sem->wait_list)) {
>                                          ^^^^^^^^^^^^^^^ is NULL
> 
> Wtf - ipc namespace should be fully initialized for the moment of
> threads run...
> 
> > Calibrating local timer... 104.99MHz.
> > CPU1: Booted secondary processor
> > CPU1: Unknown IPI message 0x1
> > CPU2: Booted secondary processor
> > CPU2: Unknown IPI message 0x1
> > CPU3: Booted secondary processor
> > CPU3: Unknown IPI message 0x1
> > Brought up 4 CPUs
> > SMP: Total of 4 processors activated (333.41 BogoMIPS).
> > ns = c0447474, ids = c04474d0
> > ns = c0447474, ids = c04474d0
> > wait_list = c04474e0
> > next =   (null)
> 
>            ^^^^^^


-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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