I finally managed to reproduce this problem consistently and within 30 secs. Bisecting the kernel points at [1] to be problematic. Whether that commit introduces a real regression or merely exposes a different underlying issue is unclear at the moment. I wasn't able to reproduce the problem with a Realtek USB NIC attached to the Pi 3B+ so that points more towards a lan78xx driver/HW issue.
Reverting commit [1] plus two follow-on fixes makes the problem go away. This looks similar to [2]. [1] https://github.com/torvalds/linux/commit/4f693b55c3d2d2239b8a0094b518a1e533cf75d5 [2] https://lore.kernel.org/netdev/[email protected]/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861936 Title: Raspberry Pi 3 network dies shortly after a burst of IPv6 tunnel network load ((lan78xx): transmit queue 0 timed out) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1861936/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
