When bringing down the netdevice (incl. detaching it) and calling netif_carrier_off directly or indirectly the latter triggers an asynchronous linkwatch event. This linkwatch event eventually may fail to access chip registers in the ndo_get_stats/ndo_get_stats64 callback because the device isn't accessible any longer, see call trace in [0].
To prevent this scenario don't check for IFF_UP only, but also make sure that the netdevice is present. [0] https://lists.openwall.net/netdev/2018/03/15/62 Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com> --- net/core/link_watch.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/link_watch.c b/net/core/link_watch.c index e38e641e9..7f51efb2b 100644 --- a/net/core/link_watch.c +++ b/net/core/link_watch.c @@ -155,7 +155,7 @@ static void linkwatch_do_dev(struct net_device *dev) clear_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state); rfc2863_policy(dev); - if (dev->flags & IFF_UP) { + if (dev->flags & IFF_UP && netif_device_present(dev)) { if (netif_carrier_ok(dev)) dev_activate(dev); else -- 2.19.0
