Description of problem: Virtual network devices in recent 4.4.x development kernel do not work. Accordingly, no network is available in virtual machines. Version-Release number of selected component (if applicable): kernel-4.4.0-0.rc0.git8.2.fc24 How reproducible: Always Steps to Reproduce: 1. Boot fully updated development system. Actual results: Command 'dmesg' reveals error messages related to virtual network devices like virbr0 and tap0 which read "virbr0: set_features() failed (-1); .." . Network is broken in virtual machines. Expected results: No kernel errors and functional virtual network devices. Additional info: Downgrade to kernel 4.3.x restores normal behaviour.
I'm seeing this here also with tun devices... they seem to come up and connect, but no tcp/udp passes. (ICMP seems to however). [ 331.110565] tun0: set_features() failed (-1); wanted 0x00000080000048c1, left 0x00000080001b48c9
Created attachment 1093852 [details] potential fix There is a thread about this upstream, can you try the following test patch that was proposed?
Issue still present for kernel-4.4.0-0.rc0.git9.1.fc24.
I just tried http://koji.fedoraproject.org/koji/taskinfo?taskID=11824289 with the potential fix and it seems to fix it up here. ;)
(In reply to Kevin Fenzi from comment #4) Weird, I have just retrieved and installed kernel-4.4.0-0.rc0.git9.1.fc24 a 2nd time and now, it actually resolves the issue.
Which one? The scratch build from comment 4? or the official one? they are named the same, but the scratch build has the patch added.
(In reply to Kevin Fenzi from comment #6) Right, it is the scratch build from comment 4, maybe I messed it up with the normal build when downloading for the first time.
(In reply to Kevin Fenzi from comment #6) The situation is the following: when Laura had informed me about her scratch build, I had already downloaded, installed and negatively tested the latest kernel build kernel-4.4.0-0.rc0.git9.1.fc24 from https://kojipkgs.fedoraproject.org//work/tasks/2431/11822431 . After your reply, I downloaded kernel-4.4.0-0.rc0.git9.1.fc24 again but this time from https://kojipkgs.fedoraproject.org//work/tasks/4292/11824292 , and indeed, this build does solve the reported kernel error for me which is perfectly consistent. I suppose that the next regular build will eventually include the patch.
The patch has been included in the rawhide kernel. I haven't heard anything from upstream despite mentioning that the patch worked.