Date:	Tue, 28 Sep 2010 04:51:00 -0400 (EDT)
From:	caiqian@...hat.com
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Américo Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH 0/3] Generic support for revoking mappings


----- "Eric W. Biederman" <ebiederm@...ssion.com> wrote:

> caiqian@...hat.com writes:
> 
> > ----- caiqian@...hat.com wrote:
> >
> >> ----- "Américo Wang" <xiyou.wangcong@...il.com> wrote:
> >> 
> >> > On Mon, Sep 27, 2010 at 04:52:29AM -0400, CAI Qian wrote:
> >> > >Just a head up. Tried to boot latest mmotm kernel with those
> >> patches
> >> > applied hit this. I am wondering what I did wrong.
> > The only tricky part of the merge I can tell was for Andrea's
> commit,
> 
> Ok.  This is down right bizarre.
> I have it running with the same merge resolution and I'm not seeing
> any problems yet.
> 
> I will probe deeper tomorrow.  Are you certain you compiled things
> properly?
Yes, still reproduce it here from a clean source. The environment is a Nehalem-EX 16 vcpus 16g mem kvm guest. Here is the full dmesg. config file also attached.

Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 2.6.36-rc5-mm1+ (root@...alhost.localdomain) (gcc version 4.4.4 20100726 (Red Hat 4.4.4-13) (GCC) ) #1 SMP Tue Sep 28 04:35:23 EDT 2010
Command line: ro root=/dev/mapper/VolGroup-lv_root rd_LVM_LV=VolGroup/lv_root rd_LVM_LV=VolGroup/lv_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=128M console=tty0 console=ttyS0,115200
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
 BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 00000000bfff0000 (usable)
 BIOS-e820: 00000000bfff0000 - 00000000c0000000 (ACPI data)
 BIOS-e820: 00000000c0000000 - 00000000c1000000 (reserved)
 BIOS-e820: 00000000fffbc000 - 0000000100000000 (reserved)
 BIOS-e820: 0000000100000000 - 00000003e9800000 (usable)
NX (Execute Disable) protection: active
DMI 2.4 present.
No AGP bridge found
last_pfn = 0x3e9800 max_arch_pfn = 0x400000000
PAT not supported by CPU.
last_pfn = 0xbfff0 max_arch_pfn = 0x400000000
found SMP MP-table at [ffff8800000fbd80] fbd80
init_memory_mapping: 0000000000000000-00000000bfff0000
init_memory_mapping: 0000000100000000-00000003e9800000
RAMDISK: 3759a000 - 37ff0000
Reserving 128MB of memory at 15888MB for crashkernel (System RAM: 16024MB)
ACPI: RSDP 00000000000fc160 00014 (v00 QEMU  )
ACPI: RSDT 00000000bfff0000 0002C (v01 QEMU   QEMURSDT 00000001 QEMU 00000001)
ACPI: FACP 00000000bfff002c 00074 (v01 QEMU   QEMUFACP 00000001 QEMU 00000001)
ACPI: DSDT 00000000bfff0100 02531 (v01   BXPC   BXDSDT 00000001 INTL 20090123)
ACPI: FACS 00000000bfff00c0 00040
ACPI: APIC 00000000bfff2638 000E0 (v01 QEMU   QEMUAPIC 00000001 QEMU 00000001)
No NUMA configuration found
Faking a node at 0000000000000000-00000003e9800000
Initmem setup node 0 0000000000000000-00000003e9800000
  NODE_DATA [00000003e97d9000 - 00000003e97fffff]
kvm-clock: Using msrs 12 and 11
kvm-clock: cpu 0, msr 0:1c26b41, boot clock
Zone PFN ranges:
  DMA      0x00000010 -> 0x00001000
  DMA32    0x00001000 -> 0x00100000
  Normal   0x00100000 -> 0x003e9800
Movable zone start PFN for each node
early_node_map[3] active PFN ranges
    0: 0x00000010 -> 0x0000009f
    0: 0x00000100 -> 0x000bfff0
    0: 0x00100000 -> 0x003e9800
ACPI: PM-Timer IO Port: 0xb008
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] enabled)
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x04] enabled)
ACPI: LAPIC (acpi_id[0x05] lapic_id[0x05] enabled)
ACPI: LAPIC (acpi_id[0x06] lapic_id[0x06] enabled)
ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] enabled)
ACPI: LAPIC (acpi_id[0x08] lapic_id[0x08] enabled)
ACPI: LAPIC (acpi_id[0x09] lapic_id[0x09] enabled)
ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x0a] enabled)
ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x0b] enabled)
ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x0c] enabled)
ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x0d] enabled)
ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x0e] enabled)
ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x0f] enabled)
ACPI: IOAPIC (id[0x10] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 16, version 17, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
Using ACPI (MADT) for SMP configuration information
SMP: Allowing 16 CPUs, 0 hotplug CPUs
PM: Registered nosave memory: 000000000009f000 - 00000000000a0000
PM: Registered nosave memory: 00000000000a0000 - 00000000000e8000
PM: Registered nosave memory: 00000000000e8000 - 0000000000100000
PM: Registered nosave memory: 00000000bfff0000 - 00000000c0000000
PM: Registered nosave memory: 00000000c0000000 - 00000000c1000000
PM: Registered nosave memory: 00000000c1000000 - 00000000fffbc000
PM: Registered nosave memory: 00000000fffbc000 - 0000000100000000
Allocating PCI resources starting at c1000000 (gap: c1000000:3efbc000)
Booting paravirtualized kernel on KVM
setup_percpu: NR_CPUS:4096 nr_cpumask_bits:16 nr_cpu_ids:16 nr_node_ids:1
PERCPU: Embedded 29 pages/cpu @ffff8800bfc00000 s88128 r8192 d22464 u131072
pcpu-alloc: s88128 r8192 d22464 u131072 alloc=1*2097152
pcpu-alloc: [0] 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 
kvm-clock: cpu 0, msr 0:bfc14b41, primary cpu clock
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 3783781
Policy zone: Normal
Kernel command line: ro root=/dev/mapper/VolGroup-lv_root rd_LVM_LV=VolGroup/lv_root rd_LVM_LV=VolGroup/lv_swap rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=128M console=tty0 console=ttyS0,115200
PID hash table entries: 4096 (order: 3, 32768 bytes)
Checking aperture...
No AGP bridge found
Memory: 14917348k/16408576k available (4801k kernel code, 1049092k absent, 442136k reserved, 7551k data, 1452k init)
Hierarchical RCU implementation.
	RCU-based detection of stalled CPUs is disabled.
	Verbose stalled-CPUs detection is disabled.
NR_IRQS:262400 nr_irqs:808
Console: colour VGA+ 80x25
console [tty0] enabled
console [ttyS0] enabled
allocated 154664960 bytes of page_cgroup
please try 'cgroup_disable=memory' option if you don't want memory cgroups
Detected 1861.771 MHz processor.
Calibrating delay loop (skipped) preset value.. 3723.54 BogoMIPS (lpj=1861771)
pid_max: default: 32768 minimum: 301
Security Framework initialized
SELinux:  Initializing.
Dentry cache hash table entries: 2097152 (order: 12, 16777216 bytes)
Inode-cache hash table entries: 1048576 (order: 11, 8388608 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
mce: CPU supports 32 MCE banks
Performance Events: p6 PMU driver.
... version:                0
... bit width:              32
... generic registers:      2
... value mask:             00000000ffffffff
... max period:             000000007fffffff
... fixed-purpose events:   0
... event mask:             0000000000000003
ACPI: Core revision 20100702
ftrace: converting mcount calls to 0f 1f 44 00 00
ftrace: allocating 18587 entries in 73 pages
Setting APIC routing to physical flat
..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1
CPU0: Intel QEMU Virtual CPU version 0.9.1 stepping 03
Booting Node   0, Processors  #1
kvm-clock: cpu 1, msr 0:bfc34b41, secondary cpu clock
 #2
kvm-clock: cpu 2, msr 0:bfc54b41, secondary cpu clock
 #3
kvm-clock: cpu 3, msr 0:bfc74b41, secondary cpu clock
 #4
kvm-clock: cpu 4, msr 0:bfc94b41, secondary cpu clock
 #5
kvm-clock: cpu 5, msr 0:bfcb4b41, secondary cpu clock
 #6
kvm-clock: cpu 6, msr 0:bfcd4b41, secondary cpu clock
 #7
kvm-clock: cpu 7, msr 0:bfcf4b41, secondary cpu clock
 #8
kvm-clock: cpu 8, msr 0:bfd14b41, secondary cpu clock
 #9
kvm-clock: cpu 9, msr 0:bfd34b41, secondary cpu clock
 #10
kvm-clock: cpu 10, msr 0:bfd54b41, secondary cpu clock
 #11
kvm-clock: cpu 11, msr 0:bfd74b41, secondary cpu clock
 #12
kvm-clock: cpu 12, msr 0:bfd94b41, secondary cpu clock
 #13
kvm-clock: cpu 13, msr 0:bfdb4b41, secondary cpu clock
 #14
kvm-clock: cpu 14, msr 0:bfdd4b41, secondary cpu clock
 #15 Ok.
kvm-clock: cpu 15, msr 0:bfdf4b41, secondary cpu clock
Brought up 16 CPUs
Total of 16 processors activated (59576.67 BogoMIPS).
devtmpfs: initialized
regulator: core version 0.5
NET: Registered protocol family 16
ACPI: bus type pci registered
PCI: Using configuration type 1 for base access
bio: create slab <bio-0> at 0
ACPI: Interpreter enabled
ACPI: (supports S0 S3 S4 S5)
ACPI: Using IOAPIC for interrupt routing
ACPI: No dock devices found.
PCI: Ignoring host bridge windows from ACPI; if necessary, use "pci=use_crs" and report a bug
ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
pci 0000:00:01.3: quirk: [io  0xb000-0xb03f] claimed by PIIX4 ACPI
pci 0000:00:01.3: quirk: [io  0xb100-0xb10f] claimed by PIIX4 SMB
ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
vgaarb: loaded
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: Using ACPI for IRQ routing
NetLabel: Initializing
NetLabel:  domain hash size = 128
NetLabel:  protocols = UNLABELED CIPSOv4
NetLabel:  unlabeled traffic allowed by default
Switching to clocksource kvm-clock
pnp: PnP ACPI init
ACPI: bus type pnp registered
pnp: PnP ACPI: found 6 devices
ACPI: ACPI bus type pnp unregistered
NET: Registered protocol family 2
IP route cache hash table entries: 524288 (order: 10, 4194304 bytes)
TCP established hash table entries: 524288 (order: 11, 8388608 bytes)
TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
TCP: Hash tables configured (established 524288 bind 65536)
TCP reno registered
UDP hash table entries: 8192 (order: 6, 262144 bytes)
UDP-Lite hash table entries: 8192 (order: 6, 262144 bytes)
NET: Registered protocol family 1
pci 0000:00:00.0: Limiting direct PCI/PCI transfers
pci 0000:00:01.0: Activating ISA DMA hang workarounds
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 10584k freed
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
Placing 64MB software IO TLB between ffff8800bbc00000 - ffff8800bfc00000
software IO TLB at phys 0xbbc00000 - 0xbfc00000
audit: initializing netlink socket (disabled)
type=2000 audit(1285663341.797:1): 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 29156
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
acpiphp: Slot [1] registered
acpiphp: Slot [2] registered
acpiphp: Slot [3] registered
acpiphp: Slot [4] registered
acpiphp: Slot [5] registered
acpiphp: Slot [6] registered
acpiphp: Slot [7] registered
acpiphp: Slot [8] registered
acpiphp: Slot [9] registered
acpiphp: Slot [10] registered
acpiphp: Slot [11] registered
acpiphp: Slot [12] registered
acpiphp: Slot [13] registered
acpiphp: Slot [14] registered
acpiphp: Slot [15] registered
acpiphp: Slot [16] registered
acpiphp: Slot [17] registered
acpiphp: Slot [18] registered
acpiphp: Slot [19] registered
acpiphp: Slot [20] registered
acpiphp: Slot [21] registered
acpiphp: Slot [22] registered
acpiphp: Slot [23] registered
acpiphp: Slot [24] registered
acpiphp: Slot [25] registered
acpiphp: Slot [26] registered
acpiphp: Slot [27] registered
acpiphp: Slot [28] registered
acpiphp: Slot [29] registered
acpiphp: Slot [30] registered
acpiphp: Slot [31] registered
pci-stub: invalid id string ""
input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
ACPI: Power Button [PWRF]
Non-volatile memory driver v1.3
Linux agpgart interface v0.103
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
�serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:05: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
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
ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
uhci_hcd 0000:00:01.2: PCI INT D -> Link[LNKD] -> GSI 11 (level, high) -> IRQ 11
uhci_hcd 0000:00:01.2: UHCI Host Controller
uhci_hcd 0000:00:01.2: new USB bus registered, assigned bus number 1
uhci_hcd 0000:00:01.2: irq 11, io base 0x0000c020
usb usb1: New USB device found, idVendor=1d6b, idProduct=0001
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: UHCI Host Controller
usb usb1: Manufacturer: Linux 2.6.36-rc5-mm1+ uhci_hcd
usb usb1: SerialNumber: 0000:00:01.2
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12
mice: PS/2 mouse device common for all mice
input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
rtc_cmos 00:01: rtc core: registered rtc_cmos as rtc0
rtc0: alarms up to one day, 114 bytes nvram
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
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 17
Registering the dns_resolver key type
registered taskstats version 1
IMA: No TPM chip found, activating TPM-bypass!
rtc_cmos 00:01: setting system clock to 2010-09-28 08:42:21 UTC (1285663341)
Initalizing network drop monitor service
Freeing unused kernel memory: 1452k freed
Write protecting the kernel read-only data: 10240k
Freeing unused kernel memory: 1324k freed
Freeing unused kernel memory: 1876k freed
BUG: unable to handle kernel paging request at ffffffffffffffc0
IP: [<ffffffff812208c0>] prio_tree_insert+0x190/0x2b0
PGD 1a27067 PUD 1a28067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: 
CPU 2 
Modules linked in:

Pid: 1, comm: init Not tainted 2.6.36-rc5-mm1+ #1 /KVM
RIP: 0010:[<ffffffff812208c0>]  [<ffffffff812208c0>] prio_tree_insert+0x190/0x2b0
RSP: 0018:ffff8803c35bdc80  EFLAGS: 00010202
RAX: ffff8803bf4ac0d8 RBX: 0000000000000100 RCX: 0000000000000000
RDX: 0000000000000179 RSI: 0000000000000000 RDI: 0000000000000179
RBP: ffff8803c35bdcb8 R08: ffff8803bf4ac0d8 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000002 R12: ffff8803c2a27868
R13: ffff8803bf4ac0d8 R14: 00000007f6ae82d8 R15: 00000007f6ae82dc
FS:  00007f6ae84f7700(0000) GS:ffff8800bfc40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffc0 CR3: 00000003bf4a9000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process init (pid: 1, threadinfo ffff8803c35bc000, task ffff8803c35bb4e0)
Stack:
 ffff8803bf4abba8 00000000ffffffff ffff8803bf4ac088 ffff8803bf4ac0d8
<0> ffff8803bf4ac088 ffff8803c2a27848 ffff8803c2a27868 ffff8803c35bdcd8
<0> ffffffff8110f220 ffff8803bf4ac1f8 ffff8803bf4ac2b0 ffff8803c35bdce8
Call Trace:
 [<ffffffff8110f220>] vma_prio_tree_insert+0x30/0x60
 [<ffffffff8111efbc>] __vma_link_file+0x4c/0x80
 [<ffffffff8111fa72>] vma_adjust+0xe2/0x560
 [<ffffffff811200bb>] __split_vma+0x1cb/0x250
 [<ffffffff81120165>] split_vma+0x25/0x30
 [<ffffffff8112281a>] mprotect_fixup+0x68a/0x730
 [<ffffffff811da3ea>] ? file_map_prot_check+0xaa/0xd0
 [<ffffffff81122a45>] sys_mprotect+0x185/0x250
 [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Code: 20 e9 d0 fe ff ff bb 01 00 00 00 48 d3 e3 48 85 db 0f 84 11 01 00 00 31 c9 66 45 85 c9 4d 89 e8 74 79 66 0f 1f 84 00 00 00 00 00 <48> 8b 46 c0 48 2b 46 b8 4c 8b 76 40 48 c1 e8 0c 4c 39 f7 4d 8d 
RIP  [<ffffffff812208c0>] prio_tree_insert+0x190/0x2b0
 RSP <ffff8803c35bdc80>
CR2: ffffffffffffffc0
---[ end trace 13e2a490d39713d8 ]---
usb 1-2: new full speed USB device using uhci_hcd and address 2
input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input2
usb 1-2: New USB device found, idVendor=0627, idProduct=0001
usb 1-2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb 1-2: Product: QEMU USB Tablet
usb 1-2: Manufacturer: QEMU 0.9.1
usb 1-2: SerialNumber: 1
input: QEMU 0.9.1 QEMU USB Tablet as /devices/pci0000:00/0000:00:01.2/usb1/1-2/1-2:1.0/input/input3
generic-usb 0003:0627:0001.0001: input,hidraw0: USB HID v0.01 Pointer [QEMU 0.9.1 QEMU USB Tablet] on usb-0000:00:01.2-2/input0

> 
> Eric
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
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