netdev - Re: [PATCH net] ipvlan: add cond_resched_rcu() while processing muticast backlog

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Date:   Mon, 9 Mar 2020 18:14:54 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>, maheshb@...gle.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, mahesh@...dewar.net,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] ipvlan: add cond_resched_rcu() while processing
 muticast backlog



On 3/9/20 6:01 PM, David Miller wrote:
> From: Mahesh Bandewar <maheshb@...gle.com>
> Date: Mon,  9 Mar 2020 15:57:02 -0700
> 
>> If there are substantial number of slaves created as simulated by
>> Syzbot, the backlog processing could take much longer and result
>> into the issue found in the Syzbot report.
>>
>> INFO: rcu_sched detected stalls on CPUs/tasks:
>>         (detected by 1, t=10502 jiffies, g=5049, c=5048, q=752)
>  ...
>>
>> Fixes: ba35f8588f47 (“ipvlan: Defer multicast / broadcast processing to a work-queue”)
>> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
>> Reported-by: syzbot <syzkaller@...glegroups.com>
> 
> Applied and queued up for -stable.


Ok, I will submit a fix on top of it then ;)

Thanks.