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

Wolfgang Walter
2015-10-01T11:35:53Z

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.
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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.

Regards,
--
Wolfgang Walter
Studentenwerk München
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