linux-kernel - Re: [REGRESSION] in 3.18-rc1: ppp crashes kernel

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Message-ID: <545CB37C.6080804@message-id.googlemail.com>
Date:	Fri, 07 Nov 2014 12:56:44 +0100
From:	Stefan Seyfried <stefan.seyfried@...glemail.com>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] in 3.18-rc1: ppp crashes kernel

Hi Paul,

Am 07.11.2014 um 12:53 schrieb Paul Bolle:
> On Fri, 2014-11-07 at 12:10 +0100, Stefan Seyfried wrote:
>> I bisected the issue multiple times and always arrived at
>>
>> # first bad commit: [d6dd50e07c5bec00db2005969b1a01f8ca3d25ef] Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>>
>> which is a merge commit unfortunately.
> 
> That merge commit actually does add some code:
> 
> git show d6dd50e07c5bec00db2005969b1a01f8ca3d25ef
> [...]
> diff --cc init/main.c
> index 8af2f1abfe38,e3c4cdd94d5b..c5c11da6c4e1
> --- a/init/main.c
> +++ b/init/main.c
> @@@ -583,6 -585,6 +583,7 @@@ asmlinkage __visible void __init start_
>   	early_irq_init();
>   	init_IRQ();
>   	tick_init();
> ++	rcu_init_nohz();
>   	init_timers();
>   	hrtimers_init();
>   	softirq_init();
> 
> Wild guess: is CONFIG_RCU_NOCB_CPU perhaps set in your
> v3.18-rc3 .config?

Yes it is:
tux@...ux:~> zgrep CONFIG_RCU_NOCB_CPU /proc/config.gz
CONFIG_RCU_NOCB_CPU=y
# CONFIG_RCU_NOCB_CPU_NONE is not set
# CONFIG_RCU_NOCB_CPU_ZERO is not set
CONFIG_RCU_NOCB_CPU_ALL=y

And I'll try without it, but looking at the backtrace and the actual
BUG_ON() in the code, I cannot really believe it is the real problems.

But I'll try with the config changed and with the above line removed.

Thanks,

	Stefan
-- 
Stefan Seyfried
Linux Consultant & Developer -- GPG Key: 0x731B665B

B1 Systems GmbH
Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de
GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537
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