Logged in on the console of a standard Fedora 23 desktop, if I ssh to another Fedora 22 or 23 machine with X forwarding and run any application that requests GLX, the application hangs. Example: ssh -Y localhost glxinfo imc@localhost's password: [never returns, can be interrupted with ^C] I have tried this at a Fedora 22 console and was unable to reproduce the hang. Also, the hang does not happen if started within a VNC session on the Fedora 23 host. When at the Fedora 23 console, the hang does happen if the remote machine is running Fedora 22, similarly with Fedora 23. But if the remote host is running Fedora 20, it works. I previously reported this on F21 (bug 1243531) but it was closed EOL and then seemed to start working again, but now the hang is back. Current versions: openssh: 7.2p2-3.fc23.x86_64 mesa: 11.1.0-2.20151218.fc23.x86_64 X server: 1.18.3-1.fc23.x86_64 kernel: 4.4.8-300.fc23.x86_64
The previous bug was reported on GLX. What makes you think the openssh is to blame? Can you take the time to pinpoint what update did break it for you? There is a lot of packages involved in your use case and when you claim it worked, we should search for the real cause of this problem. You can quite safely install F23 openssh package on F22 machine or vice versa. It will be more complicated with X server or kernel I guess. My testings: f23 $ ssh -Y localhost glxinfo does not work f23 $ ssh -Y f22 glxinfo does not work f23 $ ssh -Y f21 glxinfo does not work f22 $ ssh -Y f23 glxinfo works f22 $ ssh -Y localhost glxinfo works f22 $ ssh -Y f21 glxinfo works f21 $ ssh -Y f22 glxinfo works f21 $ ssh -Y localhost glxinfo works It is client size problem and I would try to blame X server or GLX.
Fedora 23: openssh-7.2p2-3.fc23 glx-utils-8.2.0-4.fc23 xorg-x11-apps-7.7-14.fc23 kernel-4.4.9-300.fc23 (no package mesa installed) ssh -Y localhost glxinfo * On my virtual box f23 it works * The same versions on my laptop hangs (both fully updated f23) ssh -Y f23 glxinfo * Connection from laptop to virtual f23 hangs ssh -Y laptop glxinfo * Connection from virtual f23 to laptop works There is either some other factor in this use case (hardware?). Moving to mesa-demos, which is providing this executable.
OK, on a fully updated Fedora 23 workstation *except* for xorg-x11-drv-intel-2.99.917-16.20150729.fc23 this hang does not occur. Update to xorg-x11-drv-intel-2.99.917-19.20151206.fc23 and it hangs. In addition I have unrelatedly discovered today that Matlab R2016a hangs when you try to quit it. But downgrade xorg-x11-drv-intel to 16.20150729.fc23 and the Matlab hang doesn't happen either.
This now appears to be a duplicate of Bug 1317251.
I also note that this issue goes away if Options "DRI" "2" is added to the Xorg config.
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