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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Clear (ClamAV 1.4.3/27878/Mon Jan 12 08:25:31 2026) On 1/11/26 9:55 PM, Stanislav Fomichev wrote: > On 01/09, Daniel Borkmann wrote: [...] >> +void netdev_rx_queue_lease(struct netdev_rx_queue *rxq_dst, >> + struct netdev_rx_queue *rxq_src) >> +{ >> + netdev_assert_locked(rxq_src->dev); >> + netdev_assert_locked(rxq_dst->dev); >> + >> + WARN_ON_ONCE(READ_ONCE(rxq_src->dev->reg_state) == NETREG_UNREGISTERING); > > I might have missed some of your discussions with Jakub, but what is > this WARN_ON_ONCE above trying to catch? And why not handle it explicitly > (via returning an error from netdev_rx_queue_lease)? This is basically just an assertion. The unregistering part is handled internally via __netdev_put_lock() which releases the held reference on the netdev, and if the netdev is still registered it tries to lock the instance lock. If its being unregistered that function returns NULL and therefore we bail out in the netdev_nl_queue_create_doit() at netdev_put_lock() getting a NULL device back. Thanks, Daniel