netdev - Re: [PATCH net] net: avoid weird emergency message

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Message-Id: <20190516.142723.557275007944961345.davem@davemloft.net>
Date:   Thu, 16 May 2019 14:27:23 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] net: avoid weird emergency message

From: Eric Dumazet <edumazet@...gle.com>
Date: Thu, 16 May 2019 08:09:57 -0700

> When host is under high stress, it is very possible thread
> running netdev_wait_allrefs() returns from msleep(250)
> 10 seconds late.
> 
> This leads to these messages in the syslog :
> 
> [...] unregister_netdevice: waiting for syz_tun to become free. Usage count = 0
> 
> If the device refcount is zero, the wait is over.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>

Applied, thanks.