Please keep me in CC. Starting with 4.10-rc1, I'm seeing an issue with a VM that boots an old kernel. The VM uses kernel 3.3.0 and is booted directly by qemu. This VM is a copy of a physical machine. During boot, it hangs for several seconds on "Using IPI No-Shortcut mode". The next line shows something about ata5 link down. According to the kernel timing, the difference is less than .3 seconds, however many seconds had actually passed. During boot, after fsck finishes, nothing happens, it's like it's hung. When I issue "sleep 1", it takes way longer than 1 second to complete. I made a copy of another system that has an old kernel (2.6.36.2). It boots, but it hangs for a few seconds after TCP cubic registered then prints ata4 link down. Issueing "sleep 1" takes a long time. I also noticed that issueing date several times shows the same date each time, even several minutes later. This worked with 4.9.65 and 67 (and older, I have not tested newer 4.9 kernels). If I change the qemu command line to not use KVM, it works fine, although it runs slower. I tested some other VMs that use newer kernels (like 4.4.4). They work OK. with the host being 4.10. I tested linuxmint 18.1 without problems. Issueing date several times shows the time incrementing as expected. -- Microsoft has beaten Volkswagen's world record. Volkswagen only created 22 million bugs.
