linux-kernel - Re: [BUG] Regression in 2fdac010 drivers/net/ethernet/via/via-velocity.c: update napi implementation

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Message-ID: <alpine.DEB.2.02.1309301342530.2036@localhost6.localdomain6>
Date:	Mon, 30 Sep 2013 13:43:35 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	"Ruslan N. Marchenko" <me@...f.mobi>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] Regression in 2fdac010 drivers/net/ethernet/via/via-velocity.c:
 update napi implementation

On Mon, 30 Sep 2013, Ruslan N. Marchenko wrote:

> Hi Julia et al.,
> 
> With this commit VIA NANO board get CPU lockup in random places on any network activity.
> The error is random, most of the times dead locked CPU on boot.
> 
> After loading via-velocity module it hangs for a while and then spits kernel mesages
> about hanged tasks from varios places - like ata, rcu_preempt or network stack.
> Also, if you boot the box with network disconnected - it works, until you plug the network cable.
> 
> On some kernel builds (like ubuntu stock) behaviour varies, sometimes the box itself works,
> but network stack dies after multiple ICMPv6 skb errors, so box ends up with network disconnected.
> Reloading network susbsys helps to recover for some time (depending on how fast eth led is blinking).
> 
> Reverting the patch allows me to boot without problems even from latest Linus trunk and send this mail.

There has already been a discussion about this, and a patch has already 
been proposed.  It has to do with lock managament.  I will look for the 
email.

julia
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