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

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Date:   Mon, 09 Mar 2020 18:01:53 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     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

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.