Reproduced the Wi-Fi failure again on kernel 7.0.0-28-generic with a Netgear A8000 / mt7921u adapter.
During the failure, NetworkManager reported the Wi-Fi device as unavailable and wpa_cli commands timed out. However, a direct iw scan still succeeded and returned nearby access points, so the radio/driver remained responsive enough to scan. The wpa_supplicant process had only one thread and was blocked in the kernel at: sock_alloc_send_pskb -> packet_snd -> packet_sendmsg -> __sys_sendto strace showed it blocked in sendto() on fd 12, an AF_PACKET socket. Socket diagnostics identify fd 12 as the EAPOL/802.1X (0x888e) packet socket. Its socket-memory state was: Recv-Q=214272, r=214272, rb=212992, t=213120, tb=212992, drops=472. NetworkManager logs also show that when NetworkManager was started, it repeatedly attempted to create the supplicant interface, received D-Bus Timeout was reached errors, retried five times, and then logged supplicant interface keeps failing, giving up. Recovery test: Restarting wpa_supplicant only replaced the hung process, but Wi-Fi remained unavailable because NetworkManager had already given up creating the supplicant interface. Restarting NetworkManager afterward immediately restored Wi-Fi connectivity and normal scanning. No mt7921u module unload/reload, USB reset/unplug, or reboot was required. Attached: wifi-hang-extra-20260812-123015.txt wpa-strace-20260812-123015.124865.txt wifi-debug-full-20260812-123527.txt ** Attachment added: "wifi-hang-20260812.zip" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161448/+attachment/5991576/+files/wifi-hang-20260812.zip -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2161448 Title: mt7921u: USB Wi-Fi enters unrecoverable state after prolonged uptime; NetworkManager/supplicant stalls followed by USB disconnect deadlock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161448/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
