Which kernel version has this patch?

genewitch · on Oct 16, 2022

it says it was put in to 5.10-rc1; however i noticed weird network issues beginning in june or july. I am wondering if it was put in to the kernel for 5.10 and then left "off by default" until this year.

5.15.32 was around the kernel where i noticed the issues start. If i'm just connected via SSH and streaming video from a LAN server, everything is great. if i go on youtube.com (or whatever), i'll get "network unreachable" on ping within a minute. I swapped NICs to make sure my NIC wasn't the issue; now youtube doesn't cause this issue, but i tested rsync oddly enough and the NIC goes AWOL after a few gigabytes of transfer. I have to physically unplug and replug the NIC (or a reboot if it was PCI).

I haven't had time to track down why, but it has stayed with newer kernels, too: 5.15.41, 5.15.59 also have this issue. I compiled 5.15.72 last night but i haven't rebooted yet.

apoikos · on Oct 18, 2022

The fix (commit 18ded910b58) went indeed into 5.10-rc1, and was effective day one (there is no provision for it to be turned off), so it's unlikely to have caused trouble when upgrading from 5.10 to 5.15. That said, there's a ton of changes in the networking stack between 5.10 and 5.15 - more than 10k commits for the stack and the drivers - any of which might introduce some breakage.

omginternets · on Oct 17, 2022

>I am wondering if it was put in to the kernel for 5.10 and then left "off by default" until this year.

Any idea how we might check that?

>I haven't had time to track down why, but it has stayed with newer kernels, too: 5.15.41, 5.15.59 also have this issue. I compiled 5.15.72 last night but i haven't rebooted yet.

I'm fairly certain we've seen it on `Linux 5.15.0-1017-aws x86_64`.

genewitch · on Oct 18, 2022

I could, i guess, try to load an old kernel. i tend to clean out /boot, and if the package manager deletes my kernel source all i have is a .config. I would lean toward .config diffs, but it is possible that my distribution kernel maintainers made specific patches that made this networking stuff "optional" - as is spectre and rowhammer and other speculative execution mitigation "optional". I just know my torment with networking started about 5 months ago at the closest. I didn't upgrade kernels between February and May 31st of 2022, so if it happened in there, i wouldn't be able to track that down without some sort of distro-specific archive of kernel releases.