Our company manufactures several USB devices and we use libUSB 1.0.8 to interact with these devices. Our devices function just fine when connected without the 7-Port USB Hub but almost as soon as the device is connected through the hub and we start reading/writing to the device, the system locks up completely and a hard boot is required. I should also note that this problem does occur with other newer USB hubs as well but I'm using this particular hub because I have it at home. This same problem occurs on Ubuntu 8.04 and Ubuntu 10.04 and probably others as it's looking like a kernel bug. If I use an old 4-Port Belkin non powered hub, this problem does not occur. This also does not happen with libUSB .1.
Specifics are as follows.
Linux Linux-Dev 2.6.32-26-generic-pae #47-Ubuntu SMP Wed Nov 17 16:14:46 UTC 2010 i686 GNU/Linux
7-Port USB Hub (Causes system crash)
lsusb output is listed below. The hub is Bus 001 Device 011: ID 050d:0307 Belkin Components
Bus 002 Device 009: ID 1241:1603 Belkin
Bus 002 Device 007: ID 046d:c51a Logitech, Inc. MX Revolution/G7 Cordless Mouse
Bus 002 Device 004: ID 1241:1603 Belkin
Bus 002 Device 003: ID 04bf:0320 TDK Corp. Bluetooth Adapter
Bus 002 Device 002: ID 0557:7000 ATEN International Co., Ltd Hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 011: ID 050d:0307 Belkin Components
Bus 001 Device 007: ID 059b:047b Iomega Corp.
Bus 001 Device 006: ID 0424:2228 Standard Microsystems Corp. 9-in-2 Card Reader
Bus 001 Device 005: ID 0424:2602 Standard Microsystems Corp.
Bus 001 Device 002: ID 0424:2512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
lsusb -v -d050d:0307
Bus 001 Device 011: ID 050d:0307 Belkin Components Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 2 TT per port
bMaxPacketSize0 64
idVendor 0x050d Belkin Components
idProduct 0x0307
bcdDevice 1.00
iManufacturer 0
iProduct 1 USB 2.0 Hub [MTT]
iSerial 2 001
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 41
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 1 Single TT
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 2 TT per port
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 7
wHubCharacteristic 0x0088
Ganged power switching
Per-port overcurrent protection
TT think time 8 FS bits
Port indicators
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 100 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Port 5: 0000.0100 power
Port 6: 0000.0100 power
Port 7: 0000.0100 power
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0001
Self Powered
4 Port Hub (Doesn't cause system crash)
Bus 002 Device 011: ID 0451:2046 Texas Instruments, Inc. TUSB2046 Hub Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 8
idVendor 0x0451 Texas Instruments, Inc.
idProduct 0x2046 TUSB2046 Hub
bcdDevice 1.25
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 255
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 4
wHubCharacteristic 0x0009
Per-port power switching
Per-port overcurrent protection
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 100 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0x1e
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Device Status: 0x0001
Self Powered
RF HUB (This is one of our devices)
Bus 002 Device 012: ID 078c:060c GTCO/CalComp Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x078c GTCO/CalComp
idProduct 0x060c
bcdDevice 0.01
iManufacturer 1 eInstruction
iProduct 2 Mobi RF Hub
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 41
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 3 40-00898 08 11/04/10
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 135
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)
The device is found and opened fine so here is the relevant read/write code.
Write
err = libusb_interrupt_transfer(m_usb_handle, get_Out_Endpoint(), (unsigned char*)outBuff, sizeof(outBuff), &actualBytesTransfered, 200); if(err != 0 || actualBytesTransfered != size) {
syslog(LOG_DEBUG, "NATIVESUPPORT: write_Device failed. Bytes written (%d). Error Code (%s).", actualBytesTransfered, getLibUSBErrorString(err).c_str());
}
else
{
syslog(LOG_DEBUG, "NATIVESUPPORT: write_Device Succeeded. Bytes written (%d).", actualBytesTransfered);
success = true;
}
Read
err = libusb_interrupt_transfer(m_usb_handle, IN_ENDPOINT, (unsigned char*)pData, size, &actualBytesTransfered, 1);
if (err != 0 && err != LIBUSB_ERROR_TIMEOUT && err != LIBUSB_ERROR_NO_DEVICE) {
syslog(LOG_DEBUG, "NATIVESUPPORT: read_Device failed. Bytes written (%d). Error Code (%s).", actualBytesTransfered, getLibUSBErrorString(err).c_str());
}
Logging when the issue starts. Any logging with "NATIVESUPPORT" in the message is our native library logging. You can clearly see a kernel bug as well.
Dec 2 16:07:34 Linux-Dev kernel: [ 2297.852041] usb 1-2: new high speed USB device using ehci_hcd and address 9
Dec 2 16:07:35 Linux-Dev kernel: [ 2297.986504] usb 1-2: configuration #1 chosen from 1 choice
Dec 2 16:07:35 Linux-Dev kernel: [ 2297.986699] hub 1-2:1.0: USB hub found
Dec 2 16:07:35 Linux-Dev kernel: [ 2297.986875] hub 1-2:1.0: 7 ports detected
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Native Java USB_Changed_Thread() Attached JNIEnv = 171793688
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Native Java USB_Changed_Thread() Detached JNIEnv = 171793688
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 7531
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 7531
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 4673
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1367
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1215
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 4673
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1133
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1435
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1293
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found:
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getVid() Looking For :
Dec 2 16:07:35 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getPid() Looking For :
Dec 2 16:07:58 Linux-Dev kernel: [ 2321.212677] usb 1-2.3: new full speed USB device using ehci_hcd and address 10
Dec 2 16:07:58 Linux-Dev kernel: [ 2321.309094] usb 1-2.3: configuration #1 chosen from 1 choice
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Native Java USB_Changed_Thread() Attached JNIEnv = 171794712
Dec 2 16:07:58 Linux-Dev kernel: [ 2321.314879] input: eInstruction Mobi RF Hub as /devices/pci0000:00/0000:00:02.1/usb1/1-2/1-2.3/1-2.3:1.0/input/input10
Dec 2 16:07:58 Linux-Dev kernel: [ 2321.315581] generic-usb 0003:078C:060C.0007: input,hiddev97,hidraw6: USB HID v1.11 Mouse [eInstruction Mobi RF Hub] on usb-0000:00:02.1-2.3/input0
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Native Java USB_Changed_Thread() Detached JNIEnv = 171794712
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 7531
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 7531
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 4673
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1367
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1215
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 4673
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1133
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1435
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1293
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1932
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found: 001/010
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getVid() Looking For : 001/010
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getVid() Found : 001/010
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getPid() Looking For : 001/010
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getPid() Found : 001/010
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: open_Device() Looking For : 001/010
Dec 2 16:07:58 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: open_Device() Found : 001/010
Dec 2 16:07:59 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: write_Device Succeeded. Bytes written (64).
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: last message repeated 2 times
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Native Java USB_Changed_Thread() Attached JNIEnv = 170912024
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Native Java USB_Changed_Thread() Detached JNIEnv = 170912024
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 7531
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 7531
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 4673
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1367
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1215
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 4673
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1133
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1060
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1435
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1293
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found VID: 1932
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: Found: 001/010
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getVid() Looking For : 001/010
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getVid() Found : 001/010
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getPid() Looking For : 001/010
Dec 2 16:08:01 Linux-Dev libNativeSupport[13180]: NATIVESUPPORT: getPid() Found : 001/010
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065353] ------------[ cut here ]------------
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065365] kernel BUG at /build/buildd/linux-2.6.32/mm/slub.c:2969!
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065372] invalid opcode: 0000 [#1] SMP
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065379] last sysfs file: /sys/devices/pci0000:00/0000:00:02.1/usb1/1-2/1-2.3/devnum
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065384] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat rfcomm binfmt_misc ppdev sco bridge stp bnep l2cap vboxnetadp vboxnetflt vboxdrv snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device nvidia(P) cdc_acm fbcon tileblit font bitblit softcursor snd psmouse serio_raw agpgart vga16fb vgastate joydev k8temp btusb bluetooth soundcore snd_page_alloc lp i2c_nforce2 parport usb_storage usbhid hid ohci1394 ieee1394 floppy pata_amd sata_nv forcedeth
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065484]
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065492] Pid: 14301, comm: java Tainted: P (2.6.32-26-generic-pae #47-Ubuntu)
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065499] EIP: 0060:[<c0207895>] EFLAGS: 00010246 CPU: 1
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065512] EIP is at kfree+0xf5/0x100
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065517] EAX: 80000000 EBX: c27f4400 ECX: 00000000 EDX: 00000000
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065522] ESI: 79520603 EDI: eb869c00 EBP: dec47ed4 ESP: dec47ebc
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065528] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065534] Process java (pid: 14301, ti=dec46000 task=e916bfc0 task.ti=dec46000)
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065539] Stack:
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065541] dec47ecc c035859d 79520603 79520603 00000000 eb869c00 dec47ee0 c0474158
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065554] <0> 79520603 dec47f50 c047676d 00000000 00000001 c08e4f58 decd5b55 dec47f00
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065567] <0> c0130dc8 dec47f14 c05b3b4f 4004550d e64555c0 dec47f34 eb869c98 00000918
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065582] Call Trace:
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065594] [<c035859d>] ? kref_put+0x2d/0x60
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065604] [<c0474158>] ? free_async+0x38/0x40
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065613] [<c047676d>] ? usbdev_ioctl+0x75d/0xb80
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065624] [<c0130dc8>] ? default_spin_lock_flags+0x8/0x10
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065634] [<c05b3b4f>] ? _spin_lock_irqsave+0x2f/0x50
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065643] [<c022108b>] ? vfs_ioctl+0x7b/0x90
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065651] [<c0221319>] ? do_vfs_ioctl+0x79/0x310
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065660] [<c0221f2c>] ? poll_select_set_timeout+0x6c/0x80
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065668] [<c0221617>] ? sys_ioctl+0x67/0x80
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065676] [<c01096c3>] ? sysenter_do_call+0x12/0x28
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065681] Code: 8b 03 e9 78 ff ff ff 8b 3d b0 cb 7d c0 85 ff 0f 84 48 ff ff ff 8b 0f 83 c7 04 89 f2 89 d8 ff d1 8b 0f 85 c9 75 f1 e9 32 ff ff ff <0f> 0b eb fe 8d b4 26 00 00 00 00 55 89 e5 0f 1f 44 00 00 83 e8
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065759] EIP: [<c0207895>] kfree+0xf5/0x100 SS:ESP 0068:dec47ebc
Dec 2 16:08:07 Linux-Dev kernel: [ 2330.065783] ---[ end trace 3549774142e4bf3e ]---
Jeremy Roberson
Software Engineer
eInstruction(r)'s Mobi(tm) Interactive Whiteboard - winner of Tech and Learning Award of Excellence 2010!
jeremy.roberson@xxxxxxxxxxxxxxxx
www.einstruction.com
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