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Date:   Mon, 9 Mar 2020 18:14:54 -0700
From:   Eric Dumazet <>
To:     David Miller <>,
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 <>
> 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 <>
>> Reported-by: syzbot <>
> Applied and queued up for -stable.

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


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