netdev - Re: Re: virtio_close() stuck on napi_disable

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Message-ID: <4e3e39ea-b4ae-4785-a8ca-346b66e80a9e@bytedance.com>
Date: Thu, 24 Jul 2025 16:58:30 +0800
From: Zigit Zo <zuozhijie@...edance.com>
To: Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez
 <eperezma@...hat.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Re: virtio_close() stuck on napi_disable_locked()

On 7/23/25 5:55 AM, Jakub Kicinski wrote:
> On Tue, 22 Jul 2025 13:00:14 +0200 Paolo Abeni wrote:
>> Hi,
>>
>> The NIPA CI is reporting some hung-up in the stats.py test caused by the
>> virtio_net driver stuck at close time.
>>
>> A sample splat is available here:
>>
>> https://netdev-3.bots.linux.dev/vmksft-drv-hw-dbg/results/209441/4-stats-py/stderr
>>
>> AFAICS the issue happens only on debug builds.
>>
>> I'm wild guessing to something similar to the the issue addressed by
>> commit 4bc12818b363bd30f0f7348dd9ab077290a637ae, possibly for tx_napi,
>> but I could not spot anything obvious.
>>
>> Could you please have a look?
> 
> It only hits in around 1 in 5 runs. Likely some pre-existing race, but
> it started popping up for us when be5dcaed694e ("virtio-net: fix
> recursived rtnl_lock() during probe()") was merged. It never hit before.
> If we can't find a quick fix I think we should revert be5dcaed694e for
> now, so that it doesn't end up regressing 6.16 final.

Just found that there's a new test script `netpoll_basic.py`. Before 209441,
this test did not exist at all, I randomly picked some test results prior to
its introduction and did not find any hung logs. Is it relevant?

Regards,