On Wed, 2026-02-25 at 10:58 +0100, Zdenek Bouska wrote:
> If an XDP application that requested TX timestamping is shutting down
> while the link of the interface in use is still up the following kernel
> splat is reported:
>
> [ 883.803618] [ T1554] BUG: unable to handle page fault for address:
> ffffcfb6200fd008
> ...
> [ 883.803650] [ T1554] Call Trace:
> [ 883.803652] [ T1554] <TASK>
> [ 883.803654] [ T1554] igc_ptp_tx_tstamp_event+0xdf/0x160 [igc]
> [ 883.803660] [ T1554] igc_tsync_interrupt+0x2d5/0x300 [igc]
> ...
>
> During shutdown of the TX ring the xsk_meta pointers are left behind, so
> that the IRQ handler is trying to touch them.
>
> This issue is now being fixed by cleaning up the stale xsk meta data on
> TX shutdown. TX timestamps on other queues remain unaffected.
>
> Fixes: 15fd021bc427 ("igc: Add Tx hardware timestamp request for AF_XDP
> zero-copy packet")
> Signed-off-by: Zdenek Bouska <[email protected]>
> ---
> Changes in v2:
> - Moved 'adapter' variable declaration into the if block (Vinicius)
> - Link to v1:
> https://lore.kernel.org/r/20260224-igc-fix-xdp-tx-tstamp-pagefault-v1-1-7c729ef61...@siemens.com
> ---
Reviewed-by: Florian Bezdeka <[email protected]>
