I determined the cause of the boot hang. It seems an existing hidden network connection located in `/etc/NetworkManager/system-connections/` was the culprit. Below are the steps to reproduce.
Step 1. Download attached `BrokenConnection.nmconnection` file Step 2. Place the file in `/etc/NetworkManager/system-connections/` Step 3. Either run `sudo service NetworkManager` or `sudo reboot` Step 4. Note the system freezes if restarting NetworkMangaer or displays a kernel panic during boot. ``` BUG: Kernel Null pointer Dereference, address: 0000000000000008 #PF: supervisor read acess in kernel mode #PF: error_code(0x0000) 0 not present page PGD 0 PFD 0 Oops: 0000 [#1] SMP NOPTI CPU: 7 PID: 0 Comm: swapper/7 Not tainted 5.9.0-2002-generic #3+lp1879633.2-Ubuntu Hardware name: Dell Inc. XPS 13 9310/0F7M4C, BIOS 1.1.1 10/05/2020 RIP: 0010:skb_release_data+0x74/0x1b0 ``` ** Attachment added: "A network manager connection file that causes this kernel to crash" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1879633/+attachment/5429519/+files/BrokenConnection.nmconnection -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1879633 Title: Killer 500s (QCA6390) WLAN/BT [17cb:1101] unavailable To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1879633/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
