[CentOS-virt] Xen C6 kernel 4.9.13 and testing 4.9.15 only reboots.

There was a note that the non-Xen kernel at the same kernel version did
indeed boot:
"CentOS-6 4.9.20-26 kernel exhibits the same constant
kernel-start-then-reboot issue when booting under the "CentOS Linux, with
Xen hypervisor" grub2 menu option. However, it *does* properly boot under
the "CentOS Linux (4.9.20-25.el7.x86_64) 7 (Core)" grub2 menu option!"

Trying to get back into being able to test this more.

Thanks
PJ

On Tue, Apr 18, 2017 at 8:30 AM, Johnny Hughes <johnny at centos.org> wrote:

> On 04/14/2017 03:26 PM, Anderson, Dave wrote:
> > Sad to say that I already tested 4.9.20-26 from your repo yesterday...it
> does look a little cleaner before it dies, but still dies. I have not
> tested it with the vcpu=4 wokaround, but I can tonight if you would like.
> Relevant bits below:
> >
> > Loading Xen 4.6.3-12.el7 ...
> > Loading Linux 4.9.20-26.el7.x86_64 ...
> > Loading initial ramdisk ...
> > [    0.000000] Linux version 4.9.20-26.el7.x86_64 (mockbuild@) (gcc
> version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Tue Apr 4 11:19:26
> CDT 2017
> >
> > <snip>
> >
> > [    6.195089] smpboot: Max logical packages: 1
> > [    6.199549] VPMU disabled by hypervisor.
> > [    6.203663] Performance Events: SandyBridge events, PMU not available
> due to virtualization, using software events only.
> > [    6.215436] NMI watchdog: disabled (cpu0): hardware events not enabled
> > [    6.222139] NMI watchdog: Shutting down hard lockup detector on all
> cpus
> > [    6.229165] installing Xen timer for CPU 1
> > [    6.233849] installing Xen timer for CPU 2
> > [    6.238504] installing Xen timer for CPU 3
> > [    6.243139] installing Xen timer for CPU 4
> > [    6.247836] installing Xen timer for CPU 5
> > [    6.252478] installing Xen timer for CPU 6
> > [    6.257155] installing Xen timer for CPU 7
> > [    6.261795] installing Xen timer for CPU 8
> > [    6.266358] smpboot: Package 1 of CPU 8 exceeds BIOS package data 1.
> > [    6.272736] ------------[ cut here ]------------
> > [    6.277358] kernel BUG at arch/x86/kernel/cpu/common.c:997!
> > [    6.280104] random: fast init done
> > [    6.286333] invalid opcode: 0000 [#1] SMP
> > [    6.290343] Modules linked in:
> > [    6.293430] CPU: 8 PID: 0 Comm: swapper/8 Not tainted
> 4.9.20-26.el7.x86_64 #1
> > [    6.300568] Hardware name: Supermicro X9DRT/X9DRT, BIOS 3.2a
> 08/04/2015
> > [    6.307183] task: ffff880058a68000 task.stack: ffffc900400c0000
> > [    6.313103] RIP: e030:[<ffffffff8103e7e7>]  [<ffffffff8103e7e7>]
> identify_secondary_cpu+0x57/0x80
> > [    6.322019] RSP: e02b:ffffc900400c3f08  EFLAGS: 00010086
> > [    6.327333] RAX: 00000000ffffffe4 RBX: ffff88005d80a020 RCX:
> ffffffff81e5ffc8
> > [    6.334473] RDX: 0000000000000001 RSI: 0000000000000005 RDI:
> 0000000000000005
> > [    6.341607] RBP: ffffc900400c3f18 R08: 00000000000000ce R09:
> 0000000000000000
> > [    6.348738] R10: 0000000000000005 R11: 0000000000000006 R12:
> 0000000000000008
> > [    6.355873] R13: 0000000000000000 R14: 0000000000000000 R15:
> 0000000000000000
> > [    6.363006] FS:  0000000000000000(0000) GS:ffff88005d800000(0000)
> knlGS:0000000000000000
> > [    6.371090] CS:  e033 DS: 002b ES: 002b CR0: 0000000080050033
> > [    6.376837] CR2: 0000000000000000 CR3: 0000000001e07000 CR4:
> 0000000000042660
> > [    6.383970] Stack:
> > [    6.386004]  0000000000000008 0000000000000000 ffffc900400c3f28
> ffffffff8104ebce
> > [    6.393483]  ffffc900400c3f40 ffffffff81029855 0000000000000000
> ffffc900400c3f50
> > [    6.400963]  ffffffff810298d0 0000000000000000 0000000000000000
> 0000000000000000
> > [    6.408450] Call Trace:
> > [    6.410907]  [<ffffffff8104ebce>] smp_store_cpu_info+0x3e/0x40
> > [    6.416753]  [<ffffffff81029855>] cpu_bringup+0x35/0x90
> > [    6.421981]  [<ffffffff810298d0>] cpu_bringup_and_idle+0x20/0x40
> > [    6.427987] Code: 44 89 e7 ff 50 68 0f b7 93 d2 00 00 00 39 d0 75 1c
> 0f b7 bb da 00 00 00 44 89 e6 e8 e4 02 01 00 85 c0 75 07 5b 41 5c 5d c3 0f
> 0b <0f> 0b 0f b7 8b d4 00 00 00 89 c2 44 89 e6 48 c7 c7 e8 ce ca 81
> > [    6.448249] RIP  [<ffffffff8103e7e7>] identify_secondary_cpu+0x57/
> 0x80
> > [    6.454801]  RSP <ffffc900400c3f08>
> > [    6.458305] ---[ end trace 2f9b62c5c7050204 ]---
> >
> >
> > So basically, it removes the "[Firmware Bug]: CPU1: APIC id mismatch.
> Firmware: 0 APIC: 1"  lines, but otherwise dies the same way. I included a
> few extra lines up from the panic because the "[    6.195089] smpboot: Max
> logical packages: 1" could possibly be relevant, I need to go look at a
> clean boot to see if that was in there on this machine.
> >
> >
> > Even more strangely, in addition to the machine I'm talking about which
> panics and reboots, I had a second nearly identical machine (different
> CPU/ram config, everything else the same) which booted but had some kind of
> hw conflict with 4.9.x that I never had before. It appears to be between
> Intel SCU and an intel PCIe NVMe SSD (luckily I wasn't using SCU, so I
> disabled that). Had that other machine not booted I would have just assumed
> 4.9.X was totally broken and sat on 3.18...so I'm glad that one machine
> booted at least :)
> >
> > Thanks,
> > -Dave
>
> Dave,
>
> Just for testing purposes, can you try booting the kernel in the normal
> way on the machine does does not work (a normal grub entry on the kernel
> with no xen.gz line)
>
> That way, we can hopefully narrow the issue down to a hypervisor issue
> or a kernel config issue.
>
> Thanks,
> Johnny Hughes
>
> >
> >
> >> On Apr 14, 2017, at 05:39, Johnny Hughes <johnny at centos.org> wrote:
> >>
> >> Dave,
> >>
> >> Take a look at this kernel as it is the one I think we are going to
> >> release (or a slightly newer 4.9.2x from kernel.org LTS). This version
> >> has some newer settings that are more redhat/fedora/centos base kernel
> >> like WRT what is a module and what is built into the kernel, etc.
> >>
> >> https://people.centos.org/hughesjr/4.9.x/
> >>
> >> Thanks,
> >> Johnny Hughes
> >>
> >> On 04/14/2017 05:16 AM, Anderson, Dave wrote:
> >>> List moderator: feel free to delete my previous large message with
> attachments that's in the moderation queue...it's now obsolete anyway.
> >>>
> >>>
> >>> I have found a fix/workaround for my reboot issues with Xen 4.6.3-12 +
> Kernel 4.9.13:
> >>>
> >>> Once I finally got serial output all the way through the boot process
> (xen+dom0) I discovered the stack trace:
> >>>
> >>> [Firmware Bug]: CPU7: APIC id mismatch. Firmware: 0 APIC: 7
> >>> installing Xen timer for CPU 8
> >>> [Firmware Bug]: CPU8: APIC id mismatch. Firmware: 0 APIC: 20
> >>> smpboot: Package 1 of CPU 8 exceeds BIOS package data 1.
> >>> ------------[ cut here ]------------
> >>> kernel BUG at arch/x86/kernel/cpu/common.c:997!
> >>> invalid opcode: 0000 [#1] SMP
> >>> Modules linked in:
> >>> CPU: 8 PID: 0 Comm: swapper/8 Not tainted 4.9.13-22.el7.x86_64 #1
> >>> Hardware name: Supermicro X9DRT/X9DRT, BIOS 3.2a 08/04/2015
> >>> random: fast init done
> >>> task: ffff880058a8c4c0 task.stack: ffffc900400b4000
> >>> RIP: e030:[<ffffffff8103e527>]  [<ffffffff8103e527>]
> identify_secondary_cpu+0x57/0x80
> >>> RSP: e02b:ffffc900400b7f08  EFLAGS: 00010086
> >>> RAX: 00000000ffffffe4 RBX: ffff88005d80a020 RCX: ffffffff81c5be68
> >>> RDX: 0000000000000001 RSI: 0000000000000005 RDI: 0000000000000005
> >>> RBP: ffffc900400b7f18 R08: 00000000000000cb R09: 0000000000000004
> >>> R10: 0000000000000000 R11: 0000000000000006 R12: 0000000000000008
> >>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> >>> FS:  0000000000000000(0000) GS:ffff88005d800000(0000)
> knlGS:0000000000000000
> >>> CS:  e033 DS: 002b ES: 002b CR0: 0000000080050033
> >>> CR2: 0000000000000000 CR3: 0000000001c07000 CR4: 0000000000042660
> >>> Stack:
> >>> 0000000000000008 0000000000000000 ffffc900400b7f28 ffffffff8104e94e
> >>> ffffc900400b7f40 ffffffff81029925 0000000000000000 ffffc900400b7f50
> >>> ffffffff810299a0 0000000000000000 0000000000000000 0000000000000000
> >>> Call Trace:
> >>> [<ffffffff8104e94e>] smp_store_cpu_info+0x3e/0x40
> >>> [<ffffffff81029925>] cpu_bringup+0x35/0x90
> >>> [<ffffffff810299a0>] cpu_bringup_and_idle+0x20/0x40
> >>> Code: 44 89 e7 ff 50 68 0f b7 93 d2 00 00 00 39 d0 75 1c 0f b7 bb da
> 00 00 00 44 89 e6 e8 24 03 01 00 85 c0 75 07 5b 41 5c 5d c3 0f 0b <0f> 0b
> 0f b7 8b d4 00 00 00 89 c2 44 89 e6 48 c7 c7 98 87 a6 81
> >>> RIP  [<ffffffff8103e527>] identify_secondary_cpu+0x57/0x80
> >>> RSP <ffffc900400b7f08>
> >>> ---[ end trace dc5563100443876e ]---
> >>>
> >>> I surmised that reducing the number of dom0 vcpu might solve this
> issue (they were unbounded)
> >>>
> >>> In testing adding "dom0_max_vcpus=4 dom0_vcpus_pin" to the
> GRUB_CMDLINE_XEN_DEFAULT line in /etc/defaults/grub and re-running
> grub2-mkconfig has resulted in the system I have that never booted Xen
> 4.6.3-12 + Kernel 4.9.13, booting every single time out of 5-10 tests.
> >>>
> >>>
> >>> So...I don't know if there's a race condition somewhere, or
> what...but...so far this workaround has not failed me.
> >>>
> >>> Thanks,
> >>> -Dave
> >>>
> >>>
> >>>
> >>>> On Fri, Apr 7, 2017 at 6:58 AM, PJ Welsh <pjwelsh at gmail.com
> >>>>> wrote:
> >>>>> I've not gotten any bites from my posting on the xen-devel mailing
> list.
> >>>>> Here is the only one to-date:
> >>>>> https://lists.xen.org/archives/html/xen-devel/2017-04/msg01069.html
> >>>>>
> >>>>> From that email, there needs to be some hypervisor messages.
> >>>>>
> >>>>> Does anyone know how to produce the hypervisor messages? I've already
> >>>>
> >>>>> removed the rhgb and quiet options from the boot.
> >>>>
> >>>>>
> >>>>> Thanks
> >>>>> PJ
> >>>>
> >>>>
> >>>> I spoke too soon. To get more information: Please see
> >>>>
> >>>> https://wiki.xenproject.org/wiki/Reporting_Bugs_against_Xen_Project
> >>>>
> >>>> and
> >>>>
> >>>> https://wiki.xenproject.org/wiki/Xen_Serial_Console
> >>>>
> >>>> or alternatively at least add "vga=keep".
> >>>>
>
>
>
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