netdev - Re: Xen NIC driver have page

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Message-ID: <857282f5-5df6-4ed7-b17e-92aae0cf484a@xen.org>
Date: Mon, 25 Mar 2024 12:33:30 +0000
From: Paul Durrant <xadimgnik@...il.com>
To: Jesper Dangaard Brouer <hawk@...nel.org>,
 Arthur Borsboom <arthurborsboom@...il.com>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc: Netdev <netdev@...r.kernel.org>, Wei Liu <wei.liu@...nel.org>,
 "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: Xen NIC driver have page_pool memory leaks

On 25/03/2024 12:21, Jesper Dangaard Brouer wrote:
> Hi Arthur,
> 
> (Answer inlined below, which is custom on this mailing list)
> 
> On 23/03/2024 14.23, Arthur Borsboom wrote:
>> Hi Jesper,
>>
>> After a recent kernel upgrade 6.7.6 > 6.8.1 all my Xen guests on Arch
>> Linux are dumping kernel traces.
>> It seems to be indirectly caused by the page pool memory leak
>> mechanism, which is probably a good thing.
>>
>> I have created a bug report, but there is no response.
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=218618
>>
>> I am uncertain where and to whom I need to report this page leak.
>> Can you help me get this issue fixed?
> 
> I'm the page_pool maintainer, but as you say yourself in comment 2 then
> since dba1b8a7ab68 ("mm/page_pool: catch page_pool memory leaks") this
> indicated there is a problem in the xen_netfront driver, which was
> previously not visible.
> 
> Cc'ing the "XEN NETWORK BACKEND DRIVER" maintainers, as this is a driver
> bug.  What confuses me it that I cannot find any modules named
> "xen_netfront" in the upstream tree.
> 

You should have tried '-' rather than '_' :-)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/xen-netfront.c