netdev - virtio_close() stuck on napi_disable

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Message-ID: <c5a93ed1-9abe-4880-a3bb-8d1678018b1d@redhat.com>
Date: Tue, 22 Jul 2025 13:00:14 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez
 <eperezma@...hat.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: virtio_close() stuck on napi_disable_locked()

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?

Thanks,

Paolo