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NMI watchdog failed to create perf event on cpu0: ffffffed

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[ INFO: suspicious rcu_dereference_check() usage. ]
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include/linux/cgroup.h:542 invoked rcu_dereference_check() without protection!

other info that might help us debug this:


rcu_scheduler_active = 1, debug_locks = 0
1 lock held by swapper/1:
 #0:  (net_mutex){+.+.+.}, at: [<c074a9e9>] register_pernet_subsys+0x17/0x34

stack backtrace:
Pid: 1, comm: swapper Not tainted 2.6.36-0.8.rc2.git0.fc15.i686.PAE #1
Call Trace:
 [<c07e30cf>] ? printk+0x25/0x2e
 [<c046961e>] lockdep_rcu_dereference+0x7d/0x86
 [<c07433ea>] sock_update_classid+0x6c/0x8e
 [<c074346b>] sk_alloc+0x5f/0x6a
 [<c0767001>] __netlink_create+0x2a/0x90
 [<c076894f>] netlink_kernel_create+0x5f/0x14f
 [<c0757a70>] rtnetlink_net_init+0x23/0x3b
 [<c0758e64>] ? rtnetlink_rcv+0x0/0x27
 [<c074a7dc>] ops_init+0xda/0xe9
 [<c074a91c>] register_pernet_operations+0x84/0xee
 [<c074a9f5>] register_pernet_subsys+0x23/0x34
 [<c0ab9c69>] rtnetlink_init+0x42/0xe0
 [<c0aba298>] netlink_proto_init+0xee/0x103
 [<c0403182>] do_one_initcall+0x76/0x124
 [<c0aba1aa>] ? netlink_proto_init+0x0/0x103
 [<c0a8299b>] kernel_init+0x19b/0x21c
 [<c0a82800>] ? kernel_init+0x0/0x21c
 [<c0409682>] kernel_thread_helper+0x6/0x10
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
libata version 3.00 loaded.
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: 5, 131072 bytes)
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 9, 2621440 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered
UDP hash table entries: 512 (order: 3, 49152 bytes)
UDP-Lite hash table entries: 512 (order: 3, 49152 bytes)
NET: Registered protocol family 1
PCI: CLS 0 bytes, default 64
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 26684k freed
DMA-API: preallocated 32768 debug entries
DMA-API: debugging enabled by kernel config
platform rtc_cmos: registered platform RTC device (no PNP device found)
apm: BIOS not found.
audit: initializing netlink socket (disabled)
type=2000 audit(1282672041.696:1): initialized
highmem bounce pool size: 64 pages
HugeTLB registered 2 MB page size, pre-allocated 0 pages
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
msgmni has been set to 1342
SELinux:  Registering netfilter hooks
cryptomgr_test used greatest stack depth: 6716 bytes left
alg: No test for stdrng (krng)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
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 ""
isapnp: Write Data Register 0xa79 already used
Console: switching to colour frame buffer device 100x37
console [tty0] enabled
Non-volatile memory driver v1.3
Linux agpgart interface v0.103
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
brd: module loaded
loop: module loaded
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/input0
input: Xen Virtual Pointer as /devices/virtual/input/input1
rtc_cmos: probe of rtc_cmos failed with error -16
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.18.0-ioctl (2010-06-29) initialised: dm-devel@redhat.com
cpuidle: using governor ladder
cpuidle: using governor menu
usbcore: registered new interface driver hiddev
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
ip_tables: (C) 2000-2006 Netfilter Core Team
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 17
Registering the dns_resolver key type
Using IPI No-Shortcut mode
PM: Resume from disk failed.
registered taskstats version 1
IMA: No TPM chip found, activating TPM-bypass!
XENBUS: Device with no driver: device/vbd/51712
XENBUS: Device with no driver: device/vif/0
  Magic number: 1:252:3141
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Initalizing network drop monitor service
Freeing unused kernel memory: 1848k freed
Write protecting the kernel text: 4016k
Write protecting the kernel read-only data: 1972k
mkdir used greatest stack depth: 6708 bytes left
mkdir used greatest stack depth: 6664 bytes left
dracut: dracut-007-1
dracut: rd_NO_LUKS: removing cryptoluks activation
dracut: rd_NO_LVM: removing LVM activation
udevd used greatest stack depth: 6452 bytes left
udev: starting version 161
udevd (70): /proc/70/oom_adj is deprecated, please use /proc/70/oom_score_adj instead.
udevadm used greatest stack depth: 6388 bytes left
setfont used greatest stack depth: 6360 bytes left
dracut: Starting plymouth daemon