On 10/02/2016 20:26, Gabriel L. Somlo wrote: > Hi Stefan, > > After pulling from upstream this morning, my guest VMs were no longer > able to boot. For instance, running something like > > bin/qemu-system-x86_64 -machine q35,accel=kvm -m 2048 -monitor stdio \ > -device ide-drive,bus=ide.2,drive=CD \ > -drive > id=CD,if=none,snapshot=on,file=Fedora-Live-Workstation-x86_64-22-3.iso > > Would just hang with a black screen, or sometimes partially display > the GRUB boot menu, and never make it any further than that. > > After a bisect, I narrowed it down to 5b82b70 ("memory: RCU > ram_list.dirty_memory[] for safe RAM hotplug"); reverting that > commit got me back to where my VMs were working fine, but the > actual content of the changes isn't immediately obvious. > > Apologies for the noise in case you're already aware of the problem.
No apologies needed, but indeed a fix is pending on the list (search for "memory" in today's subjects). Paolo > Otherwise, I'd be happy to test and send you debug output. > > Please advise. > > Thanks much, > --Gabriel > >