gem0 instability

[Jason Bacon]

Is this a known issue with powermacs?

May 24 14:09:06 powermacg5 kernel: gem0: device timeout
May 24 14:09:06 powermacg5 kernel: gem0: link state changed to DOWN
May 24 14:09:11 powermacg5 kernel: gem0: link state changed to UP
May 24 14:09:18 powermacg5 kernel: gem0: device timeout
May 24 14:09:18 powermacg5 kernel: gem0: link state changed to DOWN
May 24 14:09:22 powermacg5 kernel: gem0: link state changed to UP
May 24 14:09:30 powermacg5 kernel: gem0: device timeout
May 24 14:09:30 powermacg5 kernel: gem0: link state changed to DOWN
May 24 14:09:34 powermacg5 kernel: gem0: link state changed to UP

The gem0 interface has a tendency to become unstable under heavy load.  
Rebooting alleviates it.

Launching keepassxc (buildable thanks to Mark M's qt5-core patch) from a 
remote display seems to be a reliable trigger.

This machine has some visible physical damage, so I wouldn't be 
surprised if it's a local hardware issue.  It's reliable otherwise, though.

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