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Date:	Thu, 1 Oct 2015 13:32:35 +0200
From:	Holger Hoffstätte 
	<holger.hoffstaette@...glemail.com>
To:	Wolfgang Walter <linux@...m.de>, Andre Tomt <andre@...t.net>
Cc:	Julian Anastasov <ja@....bg>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>, stable@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: kernel 4.1.9: networking hangs with rcu_preempt self-detected
 stall, 4.1.8 works; was: Re: [PATCH 4.1 125/159] net: call rcu_read_lock
 early in process_backlog

On 10/01/15 13:29, Wolfgang Walter wrote:
> Am Dienstag, 29. September 2015, 12:48:43 schrieb Andre Tomt:
>> On 29. sep. 2015 12:21, Andre Tomt wrote:
>>> Meanwhile I'll revert both the mentioned net patches and see how it goes.
>>
>> So that blew up as well, meaning it's not any of these two patches:
>> [PATCH 4.1 124/159] net: do not process device backlog during unregistration
>> [PATCH 4.1 125/159] net: call rcu_read_lock early in process_backlog
>>
>> I'll be offline for a half+ day, I'll look into bisecting when back if
>> nobody has figured it out by then.
>> --
>> To unsubscribe from this list: send the line "unsubscribe stable" in
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> 
> We see these rcu hangs with 4.1.9 on one of our routers, too. 4.1.8 runs fine.
> 
> The output I got the last time was:
> 
> [ 6488.174578] igb 000:06:00.1 eth3: Reset adapter
> [ 6497.350183] INFO: rcu_preempt self-detected stall on CPU { 3}  (t=6301 jiffies g=383330 c=383329 q=1323)
> [ 6497.350229] rcu_preempt kthread starved for 6007 jiffies!
> [ 6560.311093] INFO: rcu_preempt self-detected stall on CPU { 3}  (t=25205 jiffies g=383330 c=383329 q=4479)
> [ 6560.311140] rcu_preempt kthread starved for 24911 jiffies!
> [ 6623.272005] INFO: rcu_preempt self-detected stall on CPU { 3}  (t=44109 jiffies g=383330 c=383329 q=7107)
> [ 6623.272049] rcu_preempt kthread starved for 43815 jiffies!
> [ 6633.053892] igb 000:06:00.0 eth2: Reset adapter
> [ 6633.053892] rcu_preempt kthread starved for 62719 jiffies!
> [ 6486.232914] INFO: rcu_preempt self-detected stall on CPU { 3}  (t=63013 jiffies g=383330 c=383329 q=8487)
> [ 6486.233204] rcu_preempt kthread starved for 6007 jiffies!
> 
> 
> All other hangs basically were the same, the cpu varies though.
> 
> After that the router completely hangs: networking stops working and we need to restart it.

Please see the following thread for a suggested solution:
http://www.spinics.net/lists/kernel/msg2087337.html

Please followup there as well.

thanks
Holger

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