On 04/03/2017 04:20 AM, George Dunlap wrote: > On Sun, Apr 2, 2017 at 9:22 PM, Sarah Newman <srn@xxxxxxxxx> wrote: >> On 04/02/2017 02:49 AM, Chris Elliott wrote: >>> Hi all >>> >>> I’ve got a few Intel Z87 chipset machines with Adaptec 5405 raid cards (latest firmware), they work fine on 3.18 but during Dom0 boot using kernel >>> 4.9.13 it hangs at “Using clocksource tsc” and the aacraid driver keeps trying to reset >>> >>> Has anyone seen anything like this? >>> >>> I’ve tried specifying clocksource=xen in grub instead of the default of tsc, and that has the same issue. HPET is enabled and Xen is seeing it: >>> >>> (XEN) ACPI: HPET D9649CB0, 0038 (r1 ALASKA A M I 1072009 AMI. 5) (XEN) Platform timer is 14.318MHz HPET >> >> I saw a hang at a similar place in the boot process when trying to boot xen-on-xen for our test system. On a hunch I was going to to try recompiling >> without the PVHVM PCI related driver (pci-platform ? platform-pci ? ) before saying anything about it. >> >> Since you tried changing the clock source I'm wondering is that the boot issue is unrelated to the clock source, in which case you may get a better >> idea of what's hanging by comparing the boot logs from 3.18 to 4.9 and seeing what's present in 3.18 but not in 4.9. Presumably the messages in the >> 3.18 but not 4.9 logs are either removed from the kernel source or happen after whatever is hanging. > > The Xen-on-xen thing is a specific problem with nested Xen; I asked on > xen-devel and was pointed to this commit. > > Unfortunately it's pretty unlikely this one will help Chris. > > But perhaps, Chris, if you follow my example and post a bug report to > xen-devel (with serial output from Xen and the guest kernel), someone > may be able to find a patch which fixes the problem. > I have a test kernel that fixes the xen on xen issue: https://people.centos.org/hughesjr/4.9.16/ there are 6 and 7 4.9.20 kernels in there .. give them a try. (I know, the directory say 4.9.16 and the newest kernels are 4.9.20 .. but it is going away once we build them for real :D) Also for chris: try these parameters on the vmlinux line: clocksource=tsc tsc=reliable Thanks, Johnny Hughes
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