The "hyperv_fb: Unable to send packet via vmbus" message is from synthvid_send(), drivers/video/fbdev/hyperv_fb.c (the Microsoft Hyper-V Synthetic Video Frame Buffer Driver). This error occurs when vmbus_sendpacket() fails to send a packet via the write ring buffer (see hv_ringbuffer_write())
This failure is either because: 1. the channel->rescind is zero 2. the ring buffer is full adding some more debug into hv_ringbuffer_write in the error paths may shed some more light on that. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1822133 Title: Azure Instance never recovered during series of instance reboots. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1822133/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
