linux-kernel - Re: BUG: spinlock trylock failure on UP

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Message-ID: <53513A7E.5050907@meduna.org>
Date:	Fri, 18 Apr 2014 16:45:18 +0200
From:	Stanislav Meduna <stano@...una.org>
To:	jordan <triplesquarednine@...il.com>
CC:	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: BUG: spinlock trylock failure on UP - reverting timer patches
 helps

On 18.04.2014 01:10, jordan wrote:

Hi Jordan,

many thanks for the tests. I probably botched something during
the reverting - I now tried some more experiments and the system
now runs without BUGs and without kernel leak - of course
it needs some more uptime to be really sure.

My combined revert patch from 3.12.15-rt25 is at
  http://pastebin.com/MYLqbmZw
That was all that was needed.

> Yeah, i know a handful of people [amd users] that have now reported
> success booting into 3.14-rt1 reverting those patches.  Personally, I
> have disabled NO_HZ_FULL and have switched back to 'old tick' method
> in kconfig. I don't think the latest no_hz stuff is stable enough...

My problems were with periodic timers (I am on an embedded system
that runs things periodically anyway and I have also my doubts
regarding the stability), so the latest code did not break
only NO_HZ_FULL.

Thanks
-- 
                                       Stano

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