Kernel ops when loading dom0

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Kernel ops when loading dom0

Peter Mairhofer
Hi,

After loading Xen, while loading dom0 I get the following kernel ops:

[    0.000000] PCI: Warning: Cannot find a gap in the 32bit address range
[    0.000000] PCI: Unassigned devices with 32bit resource registers may break!
[    0.173476] BUG: unable to handle kernel paging request at ffff87fffffff804
[    0.173982] IP: [<ffffffff8133f745>] xb_init_comms+0x15/0xe0
[    0.173982] PGD 0
[    0.173982] Oops: 0000 [#1] SMP
[    0.173982] last sysfs file:
[    0.173982] CPU 0
[    0.173982] Modules linked in:
[    0.173982]
[    0.173982] Pid: 1, comm: swapper veid: 0 Not tainted 2.6.32-openvz-042stab116.2-amd64 #1 042stab116_2
[    0.173982] RIP: e030:[<ffffffff8133f745>]  [<ffffffff8133f745>] xb_init_comms+0x15/0xe0
[    0.173982] RSP: e02b:ffff8803ea90be30  EFLAGS: 00010286
[    0.173982] RAX: ffffffff8240a8a0 RBX: ffff87fffffff000 RCX: ffff8803eaadbeb0
[    0.173982] RDX: ffffffff8240a7e0 RSI: ffffffff817f85b8 RDI: ffffffff8240a890
[    0.173982] RBP: ffff8803ea90be40 R08: ffff8803eaadbeb0 R09: 0000000000000300
[    0.173982] R10: ffff8803eaadbde8 R11: 0000000000000098 R12: 0000000000000000
[    0.173982] R13: ffff8803eaad4440 R14: 0000000000000004 R15: ffffffff81a969d0
[    0.173982] FS:  0000000000000000(0000) GS:ffff88002804f000(0000) knlGS:0000000000000000
[    0.173982] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[    0.173982] CR2: ffff812000002480 CR3: 0000000001a8d000 CR4: 0000000000000660
[    0.173982] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.173982] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[    0.173982] Process swapper (pid: 1, veid: 0, threadinfo ffff8803ea908000, task ffff8803ea904b40)
[    0.173982] Stack:
[    0.173982]  ffff8803ea90be90 0000000000000000 ffff8803ea90be60 ffffffff8133fdec
[    0.173982] <d> 0000000000000000 0000000000000000 ffff8803ea90be90 ffffffff81c7ebb8
[    0.173982] <d> 0000000000000000 ffff8803eaad4440

System is Debian 8.9 with Xen 4.4.1.

dom0 kernel is 2.6.32-openvz-042stab116.2-amd64. This kernel supports Xen:

# grep -i xen /boot/config-2.6.32-openvz-042stab116.2-amd64
CONFIG_XEN=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=128
CONFIG_XEN_SAVE_RESTORE=y
CONFIG_XEN_DEBUG_FS=y
CONFIG_XEN_BLKDEV_FRONTEND=m
CONFIG_NETXEN_NIC=m
CONFIG_XEN_NETDEV_FRONTEND=m
CONFIG_XEN_KBDDEV_FRONTEND=y
CONFIG_HVC_XEN=y
CONFIG_XEN_FBDEV_FRONTEND=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=m
CONFIG_XENFS=m
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_PLATFORM_PCI=y
#

Any idea what's going wrong here?




What I actually want to achieve is to boot a kernel with both Xen dom0 and OpenVZ support. Reason: I want to (slowly) migrate from OpenVZ to Xen. Fresh Xen system migrating from a different machine etc. is not an option; at least temporarily I should be able to boot Xen dom0 while my OpenVZ containers can still run.

Thanks!










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Re: Kernel ops when loading dom0

Roger Pau Monné-3
On Tue, Oct 03, 2017 at 09:57:18PM +0000, Peter Mairhofer wrote:

> Hi,
>
> After loading Xen, while loading dom0 I get the following kernel ops:
>
> [    0.000000] PCI: Warning: Cannot find a gap in the 32bit address range
> [    0.000000] PCI: Unassigned devices with 32bit resource registers may break!
> [    0.173476] BUG: unable to handle kernel paging request at ffff87fffffff804
> [    0.173982] IP: [<ffffffff8133f745>] xb_init_comms+0x15/0xe0
> [    0.173982] PGD 0
> [    0.173982] Oops: 0000 [#1] SMP
> [    0.173982] last sysfs file:
> [    0.173982] CPU 0
> [    0.173982] Modules linked in:
> [    0.173982]
> [    0.173982] Pid: 1, comm: swapper veid: 0 Not tainted 2.6.32-openvz-042stab116.2-amd64 #1 042stab116_2
> [    0.173982] RIP: e030:[<ffffffff8133f745>]  [<ffffffff8133f745>] xb_init_comms+0x15/0xe0
> [    0.173982] RSP: e02b:ffff8803ea90be30  EFLAGS: 00010286
> [    0.173982] RAX: ffffffff8240a8a0 RBX: ffff87fffffff000 RCX: ffff8803eaadbeb0
> [    0.173982] RDX: ffffffff8240a7e0 RSI: ffffffff817f85b8 RDI: ffffffff8240a890
> [    0.173982] RBP: ffff8803ea90be40 R08: ffff8803eaadbeb0 R09: 0000000000000300
> [    0.173982] R10: ffff8803eaadbde8 R11: 0000000000000098 R12: 0000000000000000
> [    0.173982] R13: ffff8803eaad4440 R14: 0000000000000004 R15: ffffffff81a969d0
> [    0.173982] FS:  0000000000000000(0000) GS:ffff88002804f000(0000) knlGS:0000000000000000
> [    0.173982] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
> [    0.173982] CR2: ffff812000002480 CR3: 0000000001a8d000 CR4: 0000000000000660
> [    0.173982] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [    0.173982] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [    0.173982] Process swapper (pid: 1, veid: 0, threadinfo ffff8803ea908000, task ffff8803ea904b40)
> [    0.173982] Stack:
> [    0.173982]  ffff8803ea90be90 0000000000000000 ffff8803ea90be60 ffffffff8133fdec
> [    0.173982] <d> 0000000000000000 0000000000000000 ffff8803ea90be90 ffffffff81c7ebb8
> [    0.173982] <d> 0000000000000000 ffff8803eaad4440
>
> System is Debian 8.9 with Xen 4.4.1.
>
> dom0 kernel is 2.6.32-openvz-042stab116.2-amd64. This kernel supports Xen:

This Linux kernel version is _very_ old, any reason you cannot use a
more current 4.x version?

Roger.

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