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

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Message-ID: <545CC0E8.4070102@message-id.googlemail.com>
Date:	Fri, 07 Nov 2014 13:54:00 +0100
From:	Stefan Seyfried <stefan.seyfried@...glemail.com>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	Paul Bolle <pebolle@...cali.nl>
Subject: Re: [REGRESSION] in 3.18-rc1: ppp crashes kernel

Am 07.11.2014 um 12:56 schrieb Stefan Seyfried:
> Hi Paul,
> 
> Am 07.11.2014 um 12:53 schrieb Paul Bolle:
>> 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.

JFTR, this did not help:
tux@...ux:~/linux> zgrep CONFIG_RCU_NOCB_CPU /proc/config.gz
# CONFIG_RCU_NOCB_CPU is not set

neither did:

--- a/init/main.c
+++ b/init/main.c
@@ -583,7 +583,7 @@ asmlinkage __visible void __init start_kernel(void)
        early_irq_init();
        init_IRQ();
        tick_init();
-       rcu_init_nohz();
+//     rcu_init_nohz();
        init_timers();
        hrtimers_init();
        softirq_init();
-- 
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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