Hey Bjørn, I'm getting some strange reports of failures in the netlink communication when adding new multiplexed links in a MBIM modem, using cdc_mbim. I also have the kernel dmesg but it doesn't give any reference to the error, the only valid thing I have is the MM debug log.
Any idea why this may fail? If I'm not mistaken, the actual multiplexed net interface creation is a process done by the kernel alone, without any interaction with the device, so not sure what could be happening. 2024-01-15T06:52:20.192634Z NOTICE ModemManager[4658]: <msg> [modem6] state changed (registered -> connecting) 2024-01-15T06:52:20.192901Z DEBUG ModemManager[4658]: <dbg> [modem6/bearer2] launching multiplexed connection with data port (net/wwan0) 2024-01-15T06:52:20.192912Z DEBUG ModemManager[4658]: <dbg> [modem6/bearer2] setting up new multiplexed link... 2024-01-15T06:52:20.193219Z DEBUG ModemManager[4658]: <dbg> Using dynamic session ID 1 2024-01-15T06:52:20.193259Z DEBUG ModemManager[4658]: <dbg> Using ifname 'mbimmux6.1' and vlan id 1 2024-01-15T06:52:20.193506Z WARNING ModemManager[4658]: <wrn> [modem6/bearer2] connection attempt #1 failed: failed to create net link for device: failed to add link for device: Could not allocate link: Failed to add link with session id 1: Netlink message with transaction 1 failed: Unknown error -1 2024-01-15T06:52:20.193634Z DEBUG ModemManager[4658]: <dbg> [modem6/bearer2] cannot set unhandled domain error as connection error: failed to create net link for device: failed to add link for device: Could not allocate link: Failed to add link with session id 1: Netlink message with transaction 1 failed: Unknown error -1 2024-01-15T06:52:20.193684Z NOTICE ModemManager[4658]: <msg> [modem6] state changed (connecting -> registered) 2024-01-15T06:52:20.193973Z NOTICE ModemManager[4658]: <msg> [modem6/bearer2] connection #1 finished: duration 0s 2024-01-15T06:52:20.193996Z WARNING ModemManager[4658]: <wrn> [modem6] couldn't connect bearer: failed to create net link for device: failed to add link for device: Could not allocate link: Failed to add link with session id 1: Netlink message with transaction 1 failed: Unknown error -1 -- Aleksander
