Hi,
While working on building up our Xen server, I've had good success so
far with launching Opensuse DomU's that use the old-style, non-pv-ops
kernels.
Now, I'm trying to launch a paravirtualized Centos6 DomU guest, and
having a heck of a time with it.
I found this in a Citrix forum
Re: Death of multi-os Virtualization?
http://forums.citrix.com/message.jspa?messageID=1456321
The latest Linux kernels, including the RHEL6 kernel, leverage a
capability called paravirt_ops -- which means that the kernel is
enabled right out of the box to work properly in a
paravirtualized Xen environment (as well as other
paravirtualization) -- without needing a special "xenified"
kernel. One of our SEs has taken it and, with a small number of
simple manual steps, gotten it up and running without a special
kernel. Red Hat's no longer shipping a Xen hypervisor doesn't
affect this at all.
So it looks like the CentOS kernel should be a paravirt_ops (same as
pv-ops I think) kernel.
I grabbed it's kernel
mount -o loop CentOS-6.0-x86_64-netinstall.iso /mnt/Centos6
cp -a /mnt/Centos6/isolinux/{vmlinuz,initrd.img} /stor/
and wrote a simple config file
cat /stor/centos6.cfg
name = 'centos6'
builder = 'linux'
kernel = '/stor/vmlinuz'
ramdisk = '/stor/initrd.img'
maxmem = 1024
memory = 1024
disk = [ 'file:/stor/CentOS-6.0-x86_64-netinstall.iso,hdc:cdrom,r',
'phy:/dev/VG0/centos6,xvda,w']
vif = [ '' ]
vfb = [ 'type=vnc, vncdisplay=1, vnclisten=127.0.0.1' ]
extra = 'textmode=1 xencons=xvc0'
on_crash = 'destroy'
on_reboot = 'restart'
on_shutdown = 'destroy'
localtime = 0
then launched it using
xm create -c /stor/centos6.cfg
The process crashes at "kernel BUG at fs/sysfs/group.c:65!;Kernel panic
- not syncing: Fatal exception". The console output is below.
I'm stumped for now. I searched online for a working config for a pv
Centos6 DomU, but so far only found configs for older kernels before
this pv-ops generation.
Is there something else I need to get this to work, or some way to debug
further what the problem is?
Thanks,
Greg
CONSOLE OUTPUT - "xmcreate -c /stor/centos6.cfg"
Using config file "/stor/centos6.cfg".
Started domain centos6 (id=10)
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 2.6.32-71.el6.x86_64 (mockbuild@xxxxxxxxxxxxxxx) (gcc
version 4.4.4 20100726 (Red Hat 4.4.4-13) (GCC) ) #1 SMP Fri May 20
03:51:51 BST 2011
Command line: textmode=1 xencons=xvc0 noirqdebug elevator=noop
KERNEL supported cpus:
Intel GenuineIntel
AMD AuthenticAMD
Centaur CentaurHauls
ACPI in unprivileged domain disabled
BIOS-provided physical RAM map:
Xen: 0000000000000000 - 00000000000a0000 (usable)
Xen: 00000000000a0000 - 0000000000100000 (reserved)
Xen: 0000000000100000 - 0000000040000000 (usable)
DMI not present or invalid.
last_pfn = 0x40000 max_arch_pfn = 0x400000000
init_memory_mapping: 0000000000000000-0000000040000000
RAMDISK: 01cbf000 - 052bf000
No NUMA configuration found
Faking a node at 0000000000000000-0000000040000000
Bootmem setup node 0 0000000000000000-0000000040000000
NODE_DATA [0000000000008000 - 000000000003bfff]
bootmap [000000000003c000 - 0000000000043fff] pages 8
(7 early reservations) ==> bootmem [0000000000 - 0040000000]
#0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 -
0000001000]
#1 [00054c2000 - 00054f1000] XEN PAGETABLES ==> [00054c2000 -
00054f1000]
#2 [0000006000 - 0000008000] TRAMPOLINE ==> [0000006000 -
0000008000]
#3 [0001000000 - 0001c9eff8] TEXT DATA BSS ==> [0001000000 -
0001c9eff8]
#4 [0001cbf000 - 00052bf000] RAMDISK ==> [0001cbf000 -
00052bf000]
#5 [00052bf000 - 00054c2000] XEN START INFO ==> [00052bf000 -
00054c2000]
#6 [0000100000 - 00002d0000] PGTABLE ==> [0000100000 -
00002d0000]
Zone PFN ranges:
DMA 0x00000001 -> 0x00001000
DMA32 0x00001000 -> 0x00100000
Normal 0x00100000 -> 0x00100000
Movable zone start PFN for each node
early_node_map[2] active PFN ranges
0: 0x00000001 -> 0x000000a0
0: 0x00000100 -> 0x00040000
SFI: Simple Firmware Interface v0.7 http://simplefirmware.org
SMP: Allowing 2 CPUs, 0 hotplug CPUs
No local APIC present
APIC: disable apic facility
PM: Registered nosave memory: 00000000000a0000 - 0000000000100000
Allocating PCI resources starting at 40000000 (gap: 40000000:c0000000)
Booting paravirtualized kernel on Xen
Xen version: 4.1.2_01-143.1 (preserve-AD)
NR_CPUS:4096 nr_cpumask_bits:2 nr_cpu_ids:2 nr_node_ids:1
PERCPU: Embedded 31 pages/cpu @ffff880005527000 s95064 r8192 d23720
u126976
pcpu-alloc: s95064 r8192 d23720 u126976 alloc=31*4096
pcpu-alloc: [0] 0 [0] 1
Xen: using vcpu_info placement
Built 1 zonelists in Node order, mobility grouping on. Total pages:
257996
Policy zone: DMA32
Kernel command line: textmode=1 xencons=xvc0 noirqdebug elevator=noop
IRQ lockup detection disabled
PID hash table entries: 4096 (order: 3, 32768 bytes)
Checking aperture...
No AGP bridge found
AMD-Vi disabled by default: pass amd_iommu=on to enable
Memory: 960752k/1048576k available (4935k kernel code, 388k absent,
87436k reserved, 3927k data, 1220k init)
Hierarchical RCU implementation.
NR_IRQS:33024 nr_irqs:288
Console: colour dummy device 80x25
console [tty0] enabled
console [hvc0] enabled
allocated 10485760 bytes of page_cgroup
please try 'cgroup_disable=memory' option if you don't want memory
cgroups
installing Xen timer for CPU 0
Detected 2806.450 MHz processor.
Calibrating delay loop (skipped), value calculated using timer
frequency.. 5612.90 BogoMIPS (lpj=2806450)
pid_max: default: 32768 minimum: 301
Security Framework initialized
SELinux: Initializing.
Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes)
Inode-cache hash table entries: 65536 (order: 7, 524288 bytes)
Mount-cache hash table entries: 256
Initializing cgroup subsys ns
Initializing cgroup subsys cpuacct
Initializing cgroup subsys memory
Initializing cgroup subsys devices
Initializing cgroup subsys freezer
Initializing cgroup subsys net_cls
Initializing cgroup subsys blkio
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
Performance Events:
no APIC, boot with the "lapic" boot parameter to force-enable it.
no hardware sampling interrupt available.
AMD PMU driver.
... version: 0
... bit width: 48
... generic registers: 4
... value mask: 0000ffffffffffff
... max period: 00007fffffffffff
... fixed-purpose events: 0
... event mask: 000000000000000f
alternatives: switching to unfair spinlock
SMP alternatives: switching to UP code
ftrace: converting mcount calls to 0f 1f 44 00 00
ftrace: allocating 20276 entries in 80 pages
installing Xen timer for CPU 1
SMP alternatives: switching to SMP code
Brought up 2 CPUs
devtmpfs: initialized
Grant table initialized
regulator: core version 0.5
NET: Registered protocol family 16
PCI: Fatal: No config space access function found
bio: create slab <bio-0> at 0
ACPI: Interpreter disabled.
xen_balloon: Initialising balloon driver.
vgaarb: loaded
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: System does not support PCI
PCI: System does not support PCI
NetLabel: Initializing
NetLabel: domain hash size = 128
NetLabel: protocols = UNLABELED CIPSOv4
NetLabel: unlabeled traffic allowed by default
Switching to clocksource xen
pnp: PnP ACPI: disabled
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 6, 262144 bytes)
TCP established hash table entries: 131072 (order: 9, 2097152 bytes)
TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered
NET: Registered protocol family 1
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 55296k freed
platform rtc_cmos: registered platform RTC device (no PNP device found)
audit: initializing netlink socket (disabled)
type=2000 audit(1316458768.773:1): initialized
HugeTLB registered 2 MB page size, pre-allocated 0 pages
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
msgmni has been set to 1984
alg: No test for stdrng (krng)
ksign: Installing public key data
Loading keyring
- Added public key B5BD89AA2E85EC04
- User ID: Red Hat, Inc. (Kernel Module GPG key)
- Added public key D4A26C9CCD09BEDA
- User ID: Red Hat Enterprise Linux Driver Update Program
<secalert@xxxxxxxxxx>
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
io scheduler noop registered (default)
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
pciehp: PCI Express Hot Plug Controller Driver version: 0.4
acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
pci-stub: invalid id string ""
Console: switching to colour frame buffer device 100x37
console [tty0] enabled
Non-volatile memory driver v1.3
Linux agpgart interface v0.103
crash memory driver: version 1.0
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
brd: module loaded
loop: module loaded
input: Macintosh mouse button emulation as /devices/virtual/input/input0
Fixed MDIO Bus: probed
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
uhci_hcd: USB Universal Host Controller Interface driver
PNP: No PS/2 controller found. Probing ports directly.
mice: PS/2 mouse device common for all mice
input: Xen Virtual Keyboard as /devices/virtual/input/input1
input: Xen Virtual Pointer as /devices/virtual/input/input2
rtc_cmos: probe of rtc_cmos failed with error -16
cpuidle: using governor ladder
cpuidle: using governor menu
usbcore: registered new interface driver hiddev
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 17
registered taskstats version 1
IMA: No TPM chip found, activating TPM-bypass!
XENBUS: Device with no driver: device/vbd/5632
XENBUS: Device with no driver: device/vbd/51712
XENBUS: Device with no driver: device/vbd/51728
XENBUS: Device with no driver: device/vbd/51744
XENBUS: Device with no driver: device/vif/0
XENBUS: Device with no driver: device/console/0
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Initalizing network drop monitor service
Freeing unused kernel memory: 1220k freed
Write protecting the kernel read-only data: 7176k
------------[ cut here ]------------
kernel BUG at fs/sysfs/group.c:65!
invalid opcode: 0000 [#1] SMP
last sysfs file: /sys/devices/virtual/block/ram12/dev
CPU 0
Modules linked in: xen_blkfront(+) ipv6 iscsi_ibft pcspkr iscsi_tcp
libiscsi_tcp libiscsi scsi_transport_iscsi squashfs cramfs
Modules linked in: xen_blkfront(+) ipv6 iscsi_ibft pcspkr iscsi_tcp
libiscsi_tcp libiscsi scsi_transport_iscsi squashfs cramfs
Pid: 16, comm: xenwatch Tainted: G W ----------------
2.6.32-71.el6.x86_64 #1
RIP: e030:[<ffffffff811e29d7>] [<ffffffff811e29d7>]
internal_create_group+0xf7/0x1a0
RSP: e02b:ffff88003eb83c60 EFLAGS: 00010246
RAX: 00000000ffffffef RBX: ffff8800041714a0 RCX: ffff88003eaf5440
RDX: ffffffff8175d160 RSI: 0000000000000000 RDI: ffff880004be8c70
RBP: ffff88003eb83cb0 R08: 0000000000000004 R09: 0000000000000000
R10: 000000000000000f R11: 0000000000000000 R12: ffff880004be8c00
R13: ffff880004be8c70 R14: ffffffff8175d160 R15: 0000000000000000
FS: 00007f5f666c4700(0000) GS:ffff880005527000(0000)
knlGS:0000000000000000
CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000001e61008 CR3: 0000000004d88000 CR4: 0000000000000660
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process xenwatch (pid: 16, threadinfo ffff88003eb82000, task
ffff88003eb50ab0)
Stack:
ffff88003eb83cc0 000000008132aae1 000000303a323032 ffff88003eb83cd0
<0> ffff88003eb83c90 ffff8800041714a0 ffff880004be8c00 ffff880004be8c60
<0> ffff880004be8c00 0000000000000000 ffff88003eb83cc0 ffffffff811e2ab3
Call Trace:
[<ffffffff811e2ab3>] sysfs_create_group+0x13/0x20
[<ffffffff810f8db4>] blk_trace_init_sysfs+0x14/0x20
[<ffffffff81243bc0>] blk_register_queue+0x40/0x100
[<ffffffff81249024>] add_disk+0x94/0x160
[<ffffffffa00983b5>] backend_changed+0x335/0x5f0 [xen_blkfront]
[<ffffffff8100fb62>] ? check_events+0x12/0x20
[<ffffffff812ea9fa>] otherend_changed+0xca/0x180
[<ffffffff812e90ea>] xenwatch_thread+0xaa/0x170
[<ffffffff81091ca0>] ? autoremove_wake_function+0x0/0x40
[<ffffffff814caa8c>] ? _spin_unlock_irqrestore+0x1c/0x20
[<ffffffff812e9040>] ? xenwatch_thread+0x0/0x170
[<ffffffff81091936>] kthread+0x96/0xa0
[<ffffffff810141ca>] child_rip+0xa/0x20
[<ffffffff81013393>] ? int_ret_from_sys_call+0x7/0x1b
[<ffffffff81013b1d>] ? retint_restore_args+0x5/0x6
[<ffffffff810141c0>] ? child_rip+0x0/0x20
Code: 8b 04 24 48 85 c0 74 27 41 83 c7 01 8b 55 bc 85 d2 74 b1 48 8b 30
48 89 df e8 76 be ff ff eb a4 48 83 7f 30 00 0f 85 49 ff ff ff <0f> 0b
eb fe 48 8b 5d c8 31 d2 48 85 db 74 18 f0 ff 0b 0f 94 c0
RIP [<ffffffff811e29d7>] internal_create_group+0xf7/0x1a0
RSP <ffff88003eb83c60>
---[ end trace d0430e72decb56f7 ]---
Kernel panic - not syncing: Fatal exception
Pid: 16, comm: xenwatch Tainted: G D W ----------------
2.6.32-71.el6.x86_64 #1
Call Trace:
[<ffffffff814c7b23>] panic+0x78/0x137
[<ffffffff814cbbf4>] oops_end+0xe4/0x100
[<ffffffff8101733b>] die+0x5b/0x90
[<ffffffff814cb4a4>] do_trap+0xc4/0x160
[<ffffffff81014ee5>] do_invalid_op+0x95/0xb0
[<ffffffff811e29d7>] ? internal_create_group+0xf7/0x1a0
[<ffffffff8118798a>] ? ilookup5+0x4a/0x60
[<ffffffff8100f33d>] ? xen_force_evtchn_callback+0xd/0x10
[<ffffffff8100fb62>] ? check_events+0x12/0x20
[<ffffffff81013f5b>] invalid_op+0x1b/0x20
[<ffffffff811e29d7>] ? internal_create_group+0xf7/0x1a0
[<ffffffff811e2ab3>] sysfs_create_group+0x13/0x20
[<ffffffff810f8db4>] blk_trace_init_sysfs+0x14/0x20
[<ffffffff81243bc0>] blk_register_queue+0x40/0x100
[<ffffffff81249024>] add_disk+0x94/0x160
[<ffffffffa00983b5>] backend_changed+0x335/0x5f0 [xen_blkfront]
[<ffffffff8100fb62>] ? check_events+0x12/0x20
[<ffffffff812ea9fa>] otherend_changed+0xca/0x180
[<ffffffff812e90ea>] xenwatch_thread+0xaa/0x170
[<ffffffff81091ca0>] ? autoremove_wake_function+0x0/0x40
[<ffffffff814caa8c>] ? _spin_unlock_irqrestore+0x1c/0x20
[<ffffffff812e9040>] ? xenwatch_thread+0x0/0x170
[<ffffffff81091936>] kthread+0x96/0xa0
[<ffffffff810141ca>] child_rip+0xa/0x20
[<ffffffff81013393>] ? int_ret_from_sys_call+0x7/0x1b
[<ffffffff81013b1d>] ? retint_restore_args+0x5/0x6
[<ffffffff810141c0>] ? child_rip+0x0/0x20
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