linux-kernel - Re: [patch V3 0/4] net, refcount: Address dst_entry reference count scalability issues

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Date:   Mon, 17 Apr 2023 14:44:25 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>, x86@...nel.org,
        Wangyang Guo <wangyang.guo@...el.com>,
        Arjan van De Ven <arjan@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>
Subject: Re: [patch V3 0/4] net, refcount: Address dst_entry reference count
 scalability issues

On Thu, Mar 23, 2023 at 09:55:27PM +0100, Thomas Gleixner wrote:
> Hi!
> 
> This is version 3 of this series. Version 2 can be found here:
> 
>      https://lore.kernel.org/lkml/20230307125358.772287565@linutronix.de

Hi,

I want to raise your attention to this bug report from Intel.
https://lore.kernel.org/all/202304162125.18b7bcdd-oliver.sang@intel.com/

We (Nvidia) are experiencing similar failures in our regressions too.
Revert of last two patches [1] from this series removed the panics, but
didn't add confidence due to another (???) netdev failure:

[ +10.080020] unregister_netdevice: waiting for eth3 to become free. Usage count = 2

Thanks 

[1]
bc9d3a9f2afc net: dst: Switch to rcuref_t reference counting
d288a162dd1c net: dst: Prevent false sharing vs. dst_entry:: __refcnt