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

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Date:	Fri, 07 Nov 2014 12:53:13 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Stefan Seyfried <stefan.seyfried@...glemail.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] in 3.18-rc1: ppp crashes kernel

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?


Paul Bolle

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