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Re: [Xen-devel] Re: 2.6.37-rc1 mainline domU - BUG: unable to handle ker

To: xen-devel@xxxxxxxxxxxxxxxxxxx, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Bruce Edge <bruce.edge@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: 2.6.37-rc1 mainline domU - BUG: unable to handle kernel paging request
From: Boris Derzhavets <bderzhavets@xxxxxxxxx>
Date: Thu, 11 Nov 2010 04:08:03 -0800 (PST)
Cc:
Delivery-date: Thu, 11 Nov 2010 04:09:36 -0800
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Now reproduced :-

root@boris-HVM-domU:~# scp  1.log 192.168.1.12:/home/boris/ubuntu
BUG: unable to handle kernel paging request at ffff88000e676930
IP: [<ffffffff810069c3>] xen_set_pmd+0x24/0x44
PGD 1a04067 PUD 1a08067 PMD ee73067 PTE 801000000e676065
Oops: 0003 [#1] SMP
last sysfs file: /sys/devices/virtual/bdi/0:22/uevent
CPU 0
Modules linked in: nfs fscache parport_pc ppdev nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs ipv6 lp parport

Pid: 3534, comm: scp Not tainted 2.6.37-rc1 #1 /
RIP: e030:[<ffffffff810069c3>]  [<ffffffff810069c3>] xen_set_pmd+0x24/0x44
RSP: e02b:ffff88006e697b18  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88000e676930 RCX: ffffc00000000f98
RDX: ffffea0000000000 RSI: 0000000000000000 RDI: ffff88000e676930
RBP: ffff88006e697b28 R08: 00007fff9d120000 R09: ffff88007ffc80a0
R10: 0000000000000000 R11: ffff88006e697ae8 R12: 0000000000000000
R13: ffff88007ffcb140 R14: ffff88000e676930 R15: ffff88006f08d7f8
FS:  00007fa525896700(0000) GS:ffff88007ffbd000(0000) knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff88000e676930 CR3: 0000000077b0f000 CR4: 0000000000002660
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process scp (pid: 3534, threadinfo ffff88006e696000, task ffff88007a32c2c0)
Stack:
 00007fa524e00000 00007fa525b37000 ffff88006e697be8 ffffffff810dc4a4
 ffff88007a26ac88 ffff88006e690298 ffff88007a26ac78 00007fa524a00000
 00007f8000000000 00007fff80000000 00007fa525b36fff 00007fa525b36fff
Call Trace:
 [<ffffffff810dc4a4>] free_pgd_range+0x213/0x397
 [<ffffffff810dc6cc>] free_pgtables+0xa4/0xc7
 [<ffffffff810dfd82>] exit_mmap+0xf2/0x12a
 [<ffffffff8104a7c5>] mmput+0x5e/0xd1
 [<ffffffff8110694b>] flush_old_exec+0x526/0x600
 [<ffffffff8113e006>] load_elf_binary+0x2dc/0x1752
 [<ffffffff8113b687>] ? load_misc_binary+0x6e/0x367
 [<ffffffff811dcee4>] ? ima_must_measure+0x21/0x2b
 [<ffffffff811dc7d6>] ? process_measurement+0x56/0xe4
 [<ffffffff81106195>] search_binary_handler+0xbb/0x24d
 [<ffffffff8113dd2a>] ? load_elf_binary+0x0/0x1752
 [<ffffffff8110785d>] do_execve+0x1c1/0x2ae
 [<ffffffff810119e5>] sys_execve+0x3e/0x55
 [<ffffffff8100af9c>] stub_execve+0x6c/0xc0
Code: 48 83 c4 18 5b c9 c3 55 48 89 e5 41 54 49 89 f4 53 48 89 fb e8 b5 e4 ff ff 48 89 df ff 05 3e 55 c3 00 e8 d5 dd ff ff 84 c0 75 05 <4c> 89 23 eb 16 e8 99 e4 ff ff 4c 89 e6 48 89 df ff 05 23 55 c3
RIP  [<ffffffff810069c3>] xen_set_pmd+0x24/0x44
 RSP <ffff88006e697b18>
CR2: ffff88000e676930
---[ end trace 073da74f4ce02315 ]---
lost connection


--- On Thu, 11/11/10, Boris Derzhavets <bderzhavets@xxxxxxxxx> wrote:

From: Boris Derzhavets <bderzhavets@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: 2.6.37-rc1 mainline domU - BUG: unable to handle kernel paging request
To: xen-devel@xxxxxxxxxxxxxxxxxxx, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx>, "Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx>, "Bruce Edge" <bruce.edge@xxxxxxxxx>
Date: Thursday, November 11, 2010, 7:01 AM

This is a mainline 2.6.37-rc1 pvops domU on top of a xen 4.0.1 and xen/stable-2.6.32.x 2.6.32.25 pvops dom0.
Now prepare NFS remote share , mount it at DomU on /mnt/tmp
after normal login  and run `ls -l /mnt/tmp`
***********
Report
***********
root@ServerLLX:/home/boris/ubuntu# xm create -c  u10.cfg
Using config file "./u10.cfg".
Started domain Ubuntu10PV (id=9)
                                Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 2.6.37-rc1 (root@ServerLLX) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #1 SMP Fri Nov 5 19:29:09 MSK 2010
Command line: root=/dev/xvda1 ro console=hvc0
ACPI in unprivileged domain disabled
released 0 pages of unused memory
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 00000000000a0000 (usable)
 Xen: 00000000000a0000 - 0000000000100000 (reserved)
 Xen: 0000000000100000 - 0000000080800000 (usable)
NX (Execute Disable) protection: active
DMI not present or invalid.
No AGP bridge found
last_pfn = 0x80800 max_arch_pfn = 0x400000000
init_memory_mapping: 0000000000000000-0000000080800000
RAMDISK: 01e98000 - 0e9fa000
No NUMA configuration found
Faking a node at 0000000000000000-0000000080800000
Initmem setup node 0 0000000000000000-0000000080800000
  NODE_DATA [000000007ffec000 - 000000007fffffff]
Zone PFN ranges:
  DMA      0x00000010 -> 0x00001000
  DMA32    0x00001000 -> 0x00100000
  Normal   empty
Movable zone start PFN for each node
early_node_map[2] active PFN ranges
    0: 0x00000010 -> 0x000000a0
    0: 0x00000100 -> 0x00080800
SMP: Allowing 1 CPUs, 0 hotplug CPUs
No local APIC present
APIC: disable apic facility
APIC: switched to apic NOOP
PM: Registered nosave memory: 00000000000a0000 - 0000000000100000
Allocating PCI resources starting at 80800000 (gap: 80800000:7f800000)
Booting paravirtualized kernel on Xen
Xen version: 4.0.1 (preserve-AD)
setup_percpu: NR_CPUS:256 nr_cpumask_bits:256 nr_cpu_ids:1 nr_node_ids:1
PERCPU: Embedded 28 pages/cpu @ffff88007ffbd000 s82752 r8192 d23744 u114688
pcpu-alloc: s82752 r8192 d23744 u114688 alloc=28*4096
pcpu-alloc: [0] 0
Built 1 zonelists in Node order, mobility grouping on.  Total pages: 519022
Policy zone: DMA32
Kernel command line: root=/dev/xvda1 ro console=hvc0
PID hash table entries: 4096 (order: 3, 32768 bytes)
Checking aperture...
No AGP bridge found
Memory: 1835560k/2105344k available (4462k kernel code, 448k absent, 269336k reserved, 6442k data, 1564k init)
Hierarchical RCU implementation.
    RCU-based detection of stalled CPUs is disabled.
NR_IRQS:16640 nr_irqs:256 16
Console: colour dummy device 80x25
console [tty0] enabled
console [hvc0] enabled
allocated 22282240 bytes of page_cgroup
please try 'cgroup_disable=memory' option if you don't want memory cgroups
installing Xen timer for CPU 0
Detected 2833.068 MHz processor.
Calibrating delay loop (skipped), value calculated using timer frequency.. 5666.13 BogoMIPS (lpj=2833068)
pid_max: default: 32768 minimum: 301
Security Framework initialized
SELinux:  Initializing.
Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
Mount-cache hash table entries: 256
Initializing cgroup subsys debug
Initializing cgroup subsys ns
ns_cgroup deprecated: consider using the 'clone_children' flag without the ns_cgroup.
Initializing cgroup subsys cpuacct
Initializing cgroup subsys memory
Initializing cgroup subsys devices
Initializing cgroup subsys freezer
Initializing cgroup subsys net_cls
CPU: Unsupported number of siblings 4
Performance Events: unsupported p6 CPU model 23 no PMU driver, software events only.
SMP alternatives: switching to UP code
Freeing SMP alternatives: 20k freed
cpu 0 spinlock event irq 254
Brought up 1 CPUs
Grant table initialized
regulator: core version 0.5
regulator: dummy:
Time: 165:165:165  Date: 165/165/65
NET: Registered protocol family 16
PCI: setting up Xen PCI frontend stub
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: 65536 (order: 7, 524288 bytes)
TCP established hash table entries: 262144 (order: 10, 4194304 bytes)
TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
TCP: Hash tables configured (established 262144 bind 65536)
TCP reno registered
UDP hash table entries: 1024 (order: 3, 32768 bytes)
UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes)
NET: Registered protocol family 1
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 208264k freed
platform rtc_cmos: registered platform RTC device (no PNP device found)
audit: initializing netlink socket (disabled)
type=2000 audit(1289476232.768:1): 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 3991
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 ""
Event-channel device installed.
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
Initialising Xen virtual ethernet driver.
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.
i8042.c: No controller found.
mice: PS/2 mouse device common for all mice
rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
rtc_cmos: probe of rtc_cmos failed with error -38
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.18.0-ioctl (2010-06-29) initialised: dm-devel@xxxxxxxxxx
cpuidle: using governor ladder
cpuidle: using governor menu
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
IPVS: Registered protocols (TCP, UDP, AH, ESP)
IPVS: Connection hash table configured (size=4096, memory=64Kbytes)
IPVS: ipvs loaded.
ip_tables: (C) 2000-2006 Netfilter Core Team
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 17
Bridge firewalling registered
Ebtables v2.0 registered
Registering the dns_resolver key type
registered taskstats version 1
IMA: No TPM chip found, activating TPM-bypass!
blkfront: xvda: barriers disabled
 xvda: xvda1 xvda2
XENBUS: Device with no driver: device/console/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: 1564k freed
Write protecting the kernel read-only data: 10240k
Freeing unused kernel memory: 1664k freed
Freeing unused kernel memory: 1904k freed
Loading, please wait...
mount: mounting none on /dev failed: No such device
udevd (63): /proc/63/oom_adj is deprecated, please use /proc/63/oom_score_adj instead.
Begin: Loading essential drivers... ...
Done.
Begin: Running /scripts/init-premount ...
Done.
Begin: Mounting root file system... ...
Begin: Running /scripts/local-top ...
Done.
Begin: Running /scripts/local-premount ...
Done.
EXT4-fs (xvda1): INFO: recovery required on readonly filesystem
EXT4-fs (xvda1): write access will be enabled during recovery
EXT4-fs (xvda1): orphan cleanup on readonly fs
EXT4-fs (xvda1): 5 orphan inodes deleted
EXT4-fs (xvda1): recovery complete
EXT4-fs (xvda1): mounted filesystem with ordered data mode. Opts: (null)
Begin: Running /scripts/local-bottom ...
Done.
Done.
Begin: Running /scripts/init-bottom ...
Done.
init: ureadahead main process (157) terminated with status 5
fsck from util-linux-ng 2.17.2
/dev/xvda1: clean, 188758/760368 files, 1083747/3041280 blocks
 * Setting sensors limits                                                [ OK ]
 * Exporting directories for NFS kernel daemon...                        [ OK ]
 * Starting NFS kernel daemon                                            [ OK ]
speech-dispatcher disabled; edit /etc/default/speech-dispatcher
 * PulseAudio configured for per-user sessions
saned disabled; edit /etc/default/saned
 * Enabling additional executable binary formats binfmt-support          [ OK ]
fsck from util-linux-ng 2.17.2
/dev/xvda1: clean, 188758/760368 files, 1083747/3041280 blocks
 * Setting sensors limits                                                [ OK ]
 * Exporting directories for NFS kernel daemon...                        [ OK ]
 * Starting NFS kernel daemon                                            [ OK ]
speech-dispatcher disabled; edit /etc/default/speech-dispatcher
 * PulseAudio configured for per-user sessions
saned disabled; edit /etc/default/saned
 * Enabling additional executable binary formats binfmt-support          [ OK ]
 * Checking battery state...                                             [ OK ]

Ubuntu 10.10 boris-HVM-domU hvc0

boris-HVM-domU login: root
Password:
Last login: Thu Nov 11 12:29:06 CET 2010 on hvc0
Linux boris-HVM-domU 2.6.37-rc1 #1 SMP Fri Nov 5 19:29:09 MSK 2010 x86_64 GNU/Linux
Ubuntu 10.10

Welcome to Ubuntu!
 * Documentation:  https://help.ubuntu.com/

root@boris-HVM-domU:~# mount 192.168.1.11:/home/boris /mnt/tmp
root@boris-HVM-domU:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvda1             12G  4.0G  6.9G  37% /
none                 1001M  116K 1001M   1% /dev
none                 1001M     0 1001M   0% /dev/shm
none                 1001M  100K 1001M   1% /var/run
none                 1001M     0 1001M   0% /var/lock
192.168.1.11:/home/boris
                       44G   21G   21G  50% /mnt/tmp

*************************************************
RUNNING 'ls -l' against NFS mounted share
*************************************************

root@boris-HVM-domU:~# ls -l /mnt/tmp
total 693924
-rw-r--r-- 1 root root 709871616 2009-06-07 18:51 osol-0906-x86.iso
drwxr-xr-x 2 root root      4096 2009-06-07 19:06 solaris
root@boris-HVM-domU:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:3e:48:b3:3c 
          inet addr:192.168.1.9  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::216:3eff:fe48:b33c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:300 errors:0 dropped:0 overruns:0 frame:0
          TX packets:94 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:30391 (30.3 KB)  TX bytes:13562 (13.5 KB)
          Interrupt:246

lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:96 errors:0 dropped:0 overruns:0 frame:0
          TX packets:96 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:8996 (8.9 KB)  TX bytes:8996 (8.9 KB)

root@boris-HVM-domU:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvda1             12G  4.0G  6.9G  37% /
none                 1001M  116K 1001M   1% /dev
none                 1001M     0 1001M   0% /dev/shm
none                 1001M  100K 1001M   1% /var/run
none                 1001M     0 1001M   0% /var/lock
192.168.1.11:/home/boris
                       44G   21G   21G  51% /mnt/tmp

Boris.



--- On Wed, 11/10/10, Bruce Edge <bruce.edge@xxxxxxxxx> wrote:

From: Bruce Edge <bruce.edge@xxxxxxxxx>
Subject: [Xen-devel] Re: 2.6.37-rc1 mainline domU - BUG: unable to handle kernel paging request
To: xen-devel@xxxxxxxxxxxxxxxxxxx, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx>, "Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx>
Date: Wednesday, November 10, 2010, 5:30 PM

On Wed, Nov 10, 2010 at 2:15 PM, Bruce Edge <bruce.edge@xxxxxxxxx> wrote:
>
> This is a mainline 2.6.37-rc1 pvops domU on top of a xen-unstable build 22241 and xen/stable-2.6.32.x 2.6.32.24 pvops dom0.
>
> The domU console output hung up prior to spitting out a prompt post root login. I logged into the domU via ssh and ran an 'ls' of an NFS mounted dir and
> this immediately came out on the domU console:
>
> [  480.467525] BUG: unable to handle kernel paging request at ffff880077e9f030
> [  480.467547] IP: [<ffffffff810355f3>] ptep_set_access_flags+0x27/0x4d
> [  480.467564] PGD 1a04067 PUD 3dd7067 PMD 3f97067 PTE 8010000077e9f065
> [  480.467587] Oops: 0003 [#1] SMP
> [  480.467601] last sysfs file: /sys/kernel/uevent_seqnum
> [  480.467611] CPU 3
> [  480.467616] Modules linked in: ext4 mbcache jbd2 crc16 xen_fbfront fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront xen_netfront xen_blkfront
> [  480.467676]
> [  480.467684] Pid: 3957, comm: zsh Not tainted 2.6.37-rc1-kernel.org-domu-6.0.bedge-debug #1 /
> [  480.467695] RIP: e030:[<ffffffff810355f3>]  [<ffffffff810355f3>] ptep_set_access_flags+0x27/0x4d
> [  480.467710] RSP: e02b:ffff880077ebfbd8  EFLAGS: 00010202
> [  480.467719] RAX: 800000004d686167 RBX: ffff8800763ddb80 RCX: 800000004d686167
> [  480.467729] RDX: ffff880077e9f030 RSI: 00007f5cb26069d0 RDI: ffff8800763ddb80
> [  480.467739] RBP: ffff880077ebfc08 R08: 0000000000000001 R09: ffffea0001a3b2d8
> [  480.467748] R10: 0000000000000100 R11: 0000000000000000 R12: 00007f5cb26069d0
> [  480.467759] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800763ddb80
> [  480.467772] FS:  00007f5cb2606700(0000) GS:ffff88007ff94000(0000) knlGS:0000000000000000
> [  480.467783] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
> [  480.467792] CR2: ffff880077e9f030 CR3: 0000000077dbc000 CR4: 0000000000002660
> [  480.467802] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [  480.467812] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [  480.467822] Process zsh (pid: 3957, threadinfo ffff880077ebe000, task ffff880078b80000)
> [  480.467832] Stack:
> [  480.467838]  0000000000000100 ffffea0001a3b2d8 7000000000000000 0000000000000000
> [  480.467862]  ffff880077e9f030 ffffea0001a3b2d8 ffff880077ebfca8 ffffffff810e2200
> [  480.467886]  ffff880077ebfc38 ffffffff81007c09 ffffea0001a3b2d8 0000000000000001
> [  480.467910] Call Trace:
> [  480.467921]  [<ffffffff810e2200>] do_wp_page+0x2d8/0x6be
> [  480.467934]  [<ffffffff81007c09>] ? __spin_time_accum+0x21/0x37
> [  480.467946]  [<ffffffff81007e85>] ? __xen_spin_lock+0xb7/0xcd
> [  480.467958]  [<ffffffff810e2e60>] handle_mm_fault+0x87a/0x8c1
> [  480.467972]  [<ffffffff814463fe>] do_page_fault+0x374/0x396
> [  480.467984]  [<ffffffff81006c3d>] ? xen_force_evtchn_callback+0xd/0xf
> [  480.467996]  [<ffffffff81006c3d>] ? xen_force_evtchn_callback+0xd/0xf
> [  480.468009]  [<ffffffff810072a2>] ? check_events+0x12/0x20
> [  480.468020]  [<ffffffff8100728f>] ? xen_restore_fl_direct_end+0x0/0x1
> [  480.468034]  [<ffffffff810a6fa4>] ? __call_rcu+0x123/0x12c
> [  480.468045]  [<ffffffff81006c3d>] ? xen_force_evtchn_callback+0xd/0xf
> [  480.468059]  [<ffffffff810072a2>] ? check_events+0x12/0x20
> [  480.468072]  [<ffffffff81443615>] page_fault+0x25/0x30
> [  480.468085]  [<ffffffff81206add>] ? __put_user_4+0x1d/0x30
> [  480.468096]  [<ffffffff810498a6>] ? schedule_tail+0x5c/0x60
> [  480.468108]  [<ffffffff8100a9c3>] ret_from_fork+0x13/0x80
> [  480.468116] Code: 41 5d c9 c3 55 48 89 e5 41 55 45 31 ed 41 54 49 89 f4 53 48 89 fb 48 83 ec 18 48 39 0a 41 0f 95 c5 45 85 c0 74 1d 45 85 ed 74 18 <48> 89 0a 48 8b 3f 0f 1f 80 00 00 00 00 4c 89 e6 48 89 df e8 b2
> [  480.468323] RIP  [<ffffffff810355f3>] ptep_set_access_flags+0x27/0x4d
> [  480.468323]  RSP <ffff880077ebfbd8>
> [  480.468323] CR2: ffff880077e9f030
> [  480.468323] ---[ end trace 6d1623321ecd50ac ]---
>
> The domU config is attached as config.2.6.37_domU_debug
>
>
> -Bruce

Here's another attempt from the same config with the full domU boot logs:

Started domain dpm (id=4)
                         [    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version
2.6.37-rc1-kernel.org-domu-6.0.bedge-debug (root@opal) (gcc version
4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #1 SMP Tue Nov 9 20:26:03 PST 2010
[    0.000000] Command line:
root=UUID=4d87e4cb-8317-41d4-aea2-ac2ebee699f7 ro   swiotlb=force
noirqbalance noirqbalance console=hvc0,115200n8 --flow_control=r
ip=:127.0.255.255::::eth0:dhcp
[    0.000000] ACPI in unprivileged domain disabled
[    0.000000] released 0 pages of unused memory
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  Xen: 0000000000000000 - 00000000000a0000 (usable)
[    0.000000]  Xen: 00000000000a0000 - 0000000000100000 (reserved)
[    0.000000]  Xen: 0000000000100000 - 0000000080800000 (usable)
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI not present or invalid.
[    0.000000] No AGP bridge found
[    0.000000] last_pfn = 0x80800 max_arch_pfn = 0x400000000
[    0.000000] Scanning 0 areas for low memory corruption
[    0.000000] init_memory_mapping: 0000000000000000-0000000080800000
[    0.000000] RAMDISK: 01d95000 - 02fa9000
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at 0000000000000000-0000000080800000
[    0.000000] Initmem setup node 0 0000000000000000-0000000080800000
[    0.000000]   NODE_DATA [000000007fffb000 - 000000007fffffff]
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000010 -> 0x00001000
[    0.000000]   DMA32    0x00001000 -> 0x00100000
[    0.000000]   Normal   empty
[    0.000000] Movable zone start PFN for each node
[    0.000000] early_node_map[2] active PFN ranges
[    0.000000]     0: 0x00000010 -> 0x000000a0
[    0.000000]     0: 0x00000100 -> 0x00080800
[    0.000000] SMP: Allowing 6 CPUs, 0 hotplug CPUs
[    0.000000] No local APIC present
[    0.000000] APIC: disable apic facility
[    0.000000] APIC: switched to apic NOOP
[    0.000000] PM: Registered nosave memory: 00000000000a0000 - 0000000000100000
[    0.000000] Allocating PCI resources starting at 80800000 (gap:
80800000:7f800000)
[    0.000000] Booting paravirtualized kernel on Xen
[    0.000000] Xen version: 4.1-unstable (preserve-AD)
[    0.000000] setup_percpu: NR_CPUS:32 nr_cpumask_bits:32
nr_cpu_ids:6 nr_node_ids:1
[    0.000000] PERCPU: Embedded 28 pages/cpu @ffff88007ff40000 s82752
r8192 d23744 u114688
[    0.000000] pcpu-alloc: s82752 r8192 d23744 u114688 alloc=28*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 [0] 4 [0] 5
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.
Total pages: 519022
[    0.000000] Policy zone: DMA32
[    0.000000] Kernel command line:
root=UUID=4d87e4cb-8317-41d4-aea2-ac2ebee699f7 ro   swiotlb=force
noirqbalance noirqbalance console=hvc0,115200n8 --flow_control=r
ip=:127.0.255.255::::eth0:dhcp
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Placing 64MB software IO TLB between ffff880079400000 -
ffff88007d400000
[    0.000000] software IO TLB at phys 0x79400000 - 0x7d400000
[    0.000000] Memory: 1959896k/2105344k available (4398k kernel code,
448k absent, 145000k reserved, 6327k data, 756k init)
[    0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0,
CPUs=6, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000]  RCU-based detection of stalled CPUs is disabled.
[    0.000000] NR_IRQS:4352 nr_irqs:320 16
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [tty0] enabled
[    0.000000] console [hvc0] enabled
[    0.000000] installing Xen timer for CPU 0
[    0.000000] Detected 2660.064 MHz processor.
[    0.000999] Calibrating delay loop (skipped), value calculated
using timer frequency.. 5320.12 BogoMIPS (lpj=2660064)
[    0.000999] pid_max: default: 32768 minimum: 301
[    0.000999] Security Framework initialized
[    0.000999] SELinux:  Initializing.
[    0.000999] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
[    0.001408] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[    0.001635] Mount-cache hash table entries: 256
[    0.002195] Initializing cgroup subsys ns
[    0.002208] ns_cgroup deprecated: consider using the
'clone_children' flag without the ns_cgroup.
[    0.002220] Initializing cgroup subsys cpuacct
[    0.002231] Initializing cgroup subsys freezer
[    0.002356] CPU: Unsupported number of siblings 16
[    0.002362] Performance Events: unsupported p6 CPU model 26 no PMU
driver, software events only.
[    0.002483] SMP alternatives: switching to UP code
[    0.004119] cpu 0 spinlock event irq 318
[    0.004765] NMI watchdog failed to create perf event on cpu0:
fffffffffffffffe
[    0.005050] installing Xen timer for CPU 1
[    0.005157] cpu 1 spinlock event irq 312
[    0.005194] SMP alternatives: switching to SMP code
[    0.000999] CPU: Unsupported number of siblings 16
[    0.006158] NMI watchdog failed to create perf event on cpu1:
fffffffffffffffe
[    0.006474] installing Xen timer for CPU 2
[    0.006585] cpu 2 spinlock event irq 306
[    0.000999] CPU: Unsupported number of siblings 16
[    0.006816] NMI watchdog failed to create perf event on cpu2:
fffffffffffffffe
[    0.006999] installing Xen timer for CPU 3
[    0.007037] cpu 3 spinlock event irq 300
[    0.000999] CPU: Unsupported number of siblings 16
[    0.007300] NMI watchdog failed to create perf event on cpu3:
fffffffffffffffe
[    0.007534] installing Xen timer for CPU 4
[    0.007636] cpu 4 spinlock event irq 294
[    0.000999] CPU: Unsupported number of siblings 16
[    0.007874] NMI watchdog failed to create perf event on cpu4:
fffffffffffffffe
[    0.008041] installing Xen timer for CPU 5
[    0.008083] cpu 5 spinlock event irq 288
[    0.000999] CPU: Unsupported number of siblings 16
[    0.008344] NMI watchdog failed to create perf event on cpu5:
fffffffffffffffe
[    0.008356] Brought up 6 CPUs
[    0.009181] kworker/u:0 used greatest stack depth: 5696 bytes left
[    0.012051] Grant table initialized
[    0.030978] Time: 165:165:165  Date: 165/165/65
[    0.031229] NET: Registered protocol family 16
[    0.036672] PCI: setting up Xen PCI frontend stub
[    0.037225] kworker/u:0 used greatest stack depth: 5528 bytes left
[    0.074302] bio: create slab <bio-0> at 0
[    0.075385] ACPI: Interpreter disabled.
[    0.077056] xen_balloon: Initialising balloon driver.
[    0.079323] vgaarb: loaded
[    0.081270] usbcore: registered new interface driver usbfs
[    0.081283] usbcore: registered new interface driver hub
[    0.081283] usbcore: registered new device driver usb
[    0.083183] PCI: System does not support PCI
[    0.084007] PCI: System does not support PCI
[    0.085236] NetLabel: Initializing
[    0.085236] NetLabel:  domain hash size = 128
[    0.085236] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.085313] NetLabel:  unlabeled traffic allowed by default
[    0.086544] Switching to clocksource xen
[    0.106256] pnp: PnP ACPI: disabled
[    0.129799] NET: Registered protocol family 2
[    0.130174] IP route cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.131882] TCP established hash table entries: 262144 (order: 10,
4194304 bytes)
[    0.132891] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
[    0.133179] TCP: Hash tables configured (established 262144 bind 65536)
[    0.133191] TCP reno registered
[    0.133301] UDP hash table entries: 1024 (order: 3, 32768 bytes)
[    0.133407] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes)
[    0.133914] NET: Registered protocol family 1
[    0.134582] RPC: Registered udp transport module.
[    0.134590] RPC: Registered tcp transport module.
[    0.134595] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.134892] Trying to unpack rootfs image as initramfs...
[    0.178824] Freeing initrd memory: 18512k freed
[    0.268798] DMA-API: preallocated 32768 debug entries
[    0.268810] DMA-API: debugging enabled by kernel config
[    0.271181] platform rtc_cmos: registered platform RTC device (no
PNP device found)
[    0.285410] Machine check injector initialized
[    0.294732] microcode: CPU0 sig=0x106a4, pf=0x2, revision=0xa
[    0.294803] microcode: CPU1 sig=0x106a4, pf=0x2, revision=0xa
[    0.294893] microcode: CPU2 sig=0x106a4, pf=0x2, revision=0xa
[    0.294944] microcode: CPU3 sig=0x106a4, pf=0x2, revision=0xa
[    0.294998] microcode: CPU4 sig=0x106a4, pf=0x2, revision=0xa
[    0.295043] microcode: CPU5 sig=0x106a4, pf=0x2, revision=0xa
[    0.295590] microcode: Microcode Update Driver: v2.00
<tigran@xxxxxxxxxxxxxxxxxxxx>, Peter Oruba
[    0.295607] Scanning for low memory corruption every 60 seconds
[    0.298813] audit: initializing netlink socket (disabled)
[    0.298940] type=2000 audit(1289403082.795:1): initialized
[    0.333762] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    0.376985] VFS: Disk quotas dquot_6.5.2
[    0.377853] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.383121] NTFS driver 2.1.29 [Flags: R/W].
[    0.385014] msgmni has been set to 3864
[    0.389953] Block layer SCSI generic (bsg) driver version 0.4
loaded (major 253)
[    0.389970] io scheduler noop registered
[    0.389979] io scheduler deadline registered
[    0.390666] io scheduler cfq registered (default)
[    0.392486] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    0.406238] pcifront pci-0: Installing PCI frontend
[    0.406967] pcifront pci-0: Creating PCI Frontend Bus 0000:00
[    0.417634] pcifront pci-0: claiming resource 0000:00:00.0/0
[    0.417634] pcifront pci-0: claiming resource 0000:00:00.0/2
[    0.417634] pcifront pci-0: claiming resource 0000:00:00.0/3
[    0.417634] pcifront pci-0: claiming resource 0000:00:00.0/4
[    0.417634] pcifront pci-0: claiming resource 0000:00:01.0/0
[    0.417634] pcifront pci-0: claiming resource 0000:00:01.0/2
[    0.417634] pcifront pci-0: claiming resource 0000:00:01.0/3
[    0.417634] pcifront pci-0: claiming resource 0000:00:01.0/4
[    0.417634] pcifront pci-0: claiming resource 0000:00:02.0/0
[    0.417634] pcifront pci-0: claiming resource 0000:00:02.0/2
[    0.417634] pcifront pci-0: claiming resource 0000:00:02.0/3
[    0.417634] pcifront pci-0: claiming resource 0000:00:02.0/4
[    0.417634] pcifront pci-0: claiming resource 0000:00:03.0/0
[    0.417634] pcifront pci-0: claiming resource 0000:00:03.0/2
[    0.417634] pcifront pci-0: claiming resource 0000:00:03.0/3
[    0.417634] pcifront pci-0: claiming resource 0000:00:03.0/4
[    0.731775] Non-volatile memory driver v1.3
[    0.731790] Linux agpgart interface v0.103
[    0.733731] [drm] Initialized drm 1.1.0 20060810
[    0.733752] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.827202] brd: module loaded
[    0.840788] loop: module loaded
[    0.841965] Fixed MDIO Bus: probed
[    0.844025] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.844651] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.845194] uhci_hcd: USB Universal Host Controller Interface driver
[    0.846985] usbcore: registered new interface driver usblp
[    0.847763] usbcore: registered new interface driver libusual
[    0.849433] PNP: No PS/2 controller found. Probing ports directly.
[    0.850279] i8042.c: No controller found.
[    0.850883] mice: PS/2 mouse device common for all mice
[    0.853446] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
[    0.854066] rtc_cmos: probe of rtc_cmos failed with error -38
[    0.855928] cpuidle: using governor ladder
[    0.855941] cpuidle: using governor menu
[    0.856029] Netfilter messages via NETLINK v0.30.
[    0.856136] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
[    0.857888] ctnetlink v0.93: registering with nfnetlink.
[    0.860285] ip_tables: (C) 2000-2006 Netfilter Core Team
[    0.860677] TCP cubic registered
[    0.860687] Initializing XFRM netlink socket
[    0.863286] NET: Registered protocol family 10
[    0.867216] ip6_tables: (C) 2000-2006 Netfilter Core Team
[    0.867612] IPv6 over IPv4 tunneling driver
[    0.871326] NET: Registered protocol family 17
[    0.871566] Registering the dns_resolver key type
[    0.873668] registered taskstats version 1
[    0.873912] kmemleak: Kernel memory leak detector initialized
[    0.873928] kmemleak: Automatic memory scanning thread started
[    0.875057] XENBUS: Device with no driver: device/vbd/51712
[    0.875057] XENBUS: Device with no driver: device/vif/0
[    0.875057] XENBUS: Device with no driver: device/console/0
[    0.875057]   Magic number: 1:252:3141
[   13.388958] Freeing unused kernel memory: 756k freed
[   13.389190] Write protecting the kernel read-only data: 10240k
[   13.398774] Freeing unused kernel memory: 1724k freed
[   13.400663] Freeing unused kernel memory: 1992k freed
[   13.494573] all_generic_ide used greatest stack depth: 5472 bytes left
[   13.519388] udevd (1111): /proc/1111/oom_adj is deprecated, please
use /proc/1111/oom_score_adj instead.
Begin: Loading essential drivers... ...
[   13.559435] blkid used greatest stack depth: 5408 bytes left
[   13.568391] blkfront: xvda: barriers disabled
[   13.574762] blkid used greatest stack depth: 5264 bytes left
[   13.580813]  xvda: xvda1 xvda2 < xvda5 >
[   13.645562] modprobe used greatest stack depth: 5088 bytes left
[   13.653160] Initialising Xen virtual ethernet driver.
[   13.659540] blkid used greatest stack depth: 4960 bytes left
[   13.735467] blkid used greatest stack depth: 4752 bytes left
Done.
Begin: Running /scripts/init-premount ...
Done.
Begin: Mounting root file system... ...
Begin: Running /scripts/local-top ...
Done.
Begin: Running /scripts/local-premount ...
Done.
[   13.903774] EXT4-fs (xvda1): INFO: recovery required on readonly filesystem
[   13.903799] EXT4-fs (xvda1): write access will be enabled during recovery
[   14.033719] EXT4-fs (xvda1): recovery complete
[   14.034966] EXT4-fs (xvda1): mounted filesystem with ordered data
mode. Opts: (null)
[   14.035510] exe used greatest stack depth: 4112 bytes left
Begin: Running /scripts/local-bottom ...
Done.
Done.
Begin: Running /scripts/init-bottom ...
Done.
init: ureadahead main process (1214) terminated with status 5
fsck from util-linux-ng 2.17.2
e2fsck 1.41.11 (14-Mar-2010)
/dev/xvda1: clean, 56314/288576 files, 287743/1153280 blocks
* Enable login on console                                               [ OK ]
* Check for hostname changes...                                         [ OK ]
   ...done.
* Setting sensors limits
         No sensors found!
Make sure you loaded all the kernel drivers you need.
Try sensors-detect to find out which these are.
No sensors found!
Make sure you loaded all the kernel drivers you need.
Try sensors-detect to find out which these are.
                                                                         [ OK ]
* Initializing random number generator...                               [ OK ]
* Setting up X server socket directory /tmp/.X11-unix...                [ OK ]
* Setting up ICE socket directory /tmp/.ICE-unix...                     [ OK ]
* Not starting fancontrol; run pwmconfig first.
* Starting internet superserver inetd                                   [ OK ]
Starting openntpd: ntpd.
* Starting network management services:
* Setting core file location...                                         [ OK ]
* Restoring resolver state...                                           [ OK ]
* Checking tomcat configuration
   ...done.
* Starting Tomcat servlet engine tomcat6
         Using CATALINA_BASE:   /var/lib/tomcat6
Using CATALINA_HOME:   /usr/share/tomcat6
Using CATALINA_TMPDIR: /tmp/tomcat6-tmp
Using JRE_HOME:        /usr/lib/jvm/java-6-openjdk
Using CLASSPATH:       /usr/share/tomcat6/bin/bootstrap.jar
                                                                         [ OK ]
collectd has been disabled - see /etc/default/collectd.
* Recording successful boot for GRUB
   ...done.
* Running local boot scripts (/etc/rc.local)                            [ OK ]
mountall: Plymouth command failed
mountall: Disconnected from Plymouth

6.0.16-01
kaan-04-dpm login: root
Password:
[   42.646538] ------------[ cut here ]------------
[   42.646556] kernel BUG at arch/x86/xen/mmu.c:1831!
[   42.646566] invalid opcode: 0000 [#1] SMP
[   42.646582] last sysfs file: /sys/kernel/uevent_seqnum
[   42.646592] CPU 0
[   42.646598] Modules linked in: ext4 mbcache jbd2 crc16 xen_fbfront
fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront
xen_netfront xen_blkfront
[   42.646665]
[   42.646674] Pid: 3916, comm: lsb_release Not tainted
2.6.37-rc1-kernel.org-domu-6.0.bedge-debug #1 /
[   42.646688] RIP: e030:[<ffffffff81004bce>]  [<ffffffff81004bce>]
pin_pagetable_pfn+0x31/0x37
[   42.646711] RSP: e02b:ffff88007595bce8  EFLAGS: 00010282
[   42.646721] RAX: 00000000ffffffea RBX: 000000000007751e RCX: 0000000000000001
[   42.646732] RDX: 00000000deadbeef RSI: 00000000deadbeef RDI: 00000000deadbeef
[   42.646744] RBP: ffff88007595bd08 R08: 00003ffffffff000 R09: ffff880000000000
[   42.646756] R10: 00000000deadbeef R11: dead000000200200 R12: 0000000000000003
[   42.646768] R13: ffff880075c90150 R14: ffff8800781d9398 R15: ffff880075161d40
[   42.646784] FS:  00007fee63b01700(0000) GS:ffff88007ff40000(0000)
knlGS:0000000000000000
[   42.646797] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[   42.646807] CR2: 00007faac54182b8 CR3: 00000000771dd000 CR4: 0000000000002660
[   42.646819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   42.646832] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   42.646844] Process lsb_release (pid: 3916, threadinfo
ffff88007595a000, task ffff880075161d40)
[   42.646857] Stack:
[   42.646864]  ffff880000000000 00000000000484f0 ffff8800777c6d80
000000000007751e
[   42.646892]  ffff88007595bd28 ffffffff810066a8 000000000007751e
ffff8800777c6d80
[   42.646919]  ffff88007595bd38 ffffffff810066db ffff88007595bd78
ffffffff810e048f
[   42.646946] Call Trace:
[   42.646959]  [<ffffffff810066a8>] xen_alloc_ptpage+0x68/0x6d
[   42.646973]  [<ffffffff810066db>] xen_alloc_pte+0xe/0x10
[   42.646989]  [<ffffffff810e048f>] __pte_alloc+0x72/0xd7
[   42.647003]  [<ffffffff810e2717>] handle_mm_fault+0x131/0x8c1
[   42.647017]  [<ffffffff810e6e36>] ? mmap_region+0x391/0x4bf
[   42.647033]  [<ffffffff8100eb84>] ? arch_get_unmapped_area_topdown+0x4a/0x28a
[   42.647052]  [<ffffffff814463fe>] do_page_fault+0x374/0x396
[   42.647059]  [<ffffffff8102b78a>] ? pvclock_clocksource_read+0x4b/0xb4
[   42.647059]  [<ffffffff81007c09>] ? __spin_time_accum+0x21/0x37
[   42.647059]  [<ffffffff81007e85>] ? __xen_spin_lock+0xb7/0xcd
[   42.647059]  [<ffffffff81443615>] page_fault+0x25/0x30
[   42.647059] Code: ec 20 89 7d e0 48 89 f7 e8 c0 ff ff ff 48 8d 7d
e0 48 89 45 e8 be 01 00 00 00 31 d2 41 ba f0 7f 00 00 e8 76 c7 ff ff
85 c0 74 04 <0f> 0b eb fe c9 c3 55 48 89 e5 41 54 49 89 fc 53 31 db 48
8b 3d
[   42.647059] RIP  [<ffffffff81004bce>] pin_pagetable_pfn+0x31/0x37
[   42.647059]  RSP <ffff88007595bce8>
[   42.647059] ---[ end trace 3fbbffee414a5166 ]---

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