Re: [PATCH] net: usbnet: Avoid potential RCU stall on LINK_CHANGE event

On Thu, 10 Jul 2025 08:50:40 +0000 John Ernberg wrote:

Having a Gemalto Cinterion PLS83-W modem attached to USB and activating the cellular data link would sometimes yield the following RCU stall, leading to a system freeze:

Do you know which sub-driver it's using? I'm worried that this is still racy. Since usbnet_bh checks if carrier is ok and __handle_link_change() checks the opposite something must be out of sync if both run. Most likely something restored the carrier while we're still handling the previous carrier loss.