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Windows 7: BSOD (0x0000001A) randomly during normal use

09 Jan 2013   #1

Windows 7 Home Premium 64bit
BSOD (0x0000001A) randomly during normal use

Good evening, first time poster here.

I built my computer about 1 year ago, and until now I haven't had any problems like this. It started just before christmas I think, when I got one BSOD. I didn't think about it too much, as it seemed to happen out of nowhere. But now it has happened three times during the last 1-2 weeks, and it's quite annoying. Especially this last time, as I was painting in photoshop and had forgotten to save my work, which unfortunately was lost in the crash.

Anyhow, the last two BSODs have happened seemingly at random (both times I was starting a playback of an audio file, but not sure if that is relevant) while surfing etc. like normal. Photoshop was open at least 2 of the 4 times it has happened, maybe more.

Data and further info attached in .zip file.

I would appreciate any and all help on this matter, as I've never really dealt with any similar problem with Windows before.

Thank you!

My System SpecsSystem Spec
09 Jan 2013   #2

Microsoft Community Contributor Award Recipient

Windows 10 Home 64Bit


Take memtest. Run for 8 passes and test each stick in a know good slot for an additional 6 passes.
The goal is to test all the RAM sticks and all the motherboard slots.

Check your motherboard manual to ensure the RAM sticks are in the recommended motherboard slots. Some motherboards have very specific slots required for the number of RAM sticks installed.

If you get errors, stop the test and continue with the next step.

1. Remove all but one stick of RAM from your computer (this will be RAM stick #1), and run Memtest86 again, for 7 passes.
*Be sure to note the RAM stick, use a piece of tape with a number, and note the motherboard slot.
If this stick passes the test then go to step #3.

2. If RAM stick #1 has errors, repeat the test with RAM stick #2 in the same motherboard slot.
*If RAM stick #2 passes, this indicates that RAM stick #1 may be bad. If you want to be absolutely sure, re-test RAM stick #1 in another known good slot.
*If RAM stick #2 has errors, this indicates another possible bad RAM stick, a possible motherboard slot failure or inadequate settings.
3. Test the next stick of RAM (stick #2) in the next motherboard slot.
*If this RAM stick has errors repeat step #2 using a known good stick if possible, or another stick.
*If this RAM stick has no errors and both sticks failed in slot#1, test RAM stick #1 in this slot.
4. If you find a stick that passes the test, test it in all the other motherboard slots.

If Part 2 testing shows errors, and all tests in Part 3 show errors, you will need to test the RAM sticks in another computer and/or test other RAM in your computer to identify the problem.

In this way, you can identify whether it is a bad stick of RAM, a bad motherboard, or incompatibility between the sticks.
information   Information
Errors are sometimes found after 8 passes.

Tip   Tip
Do this test overnight, before going to bed.
My System SpecsSystem Spec
11 Mar 2013   #3

Windows 7 Home Premium 64bit

Hi again, sorry for not responding earlier, but I've been busy with moving to another apartment, so I haven't been able to start troubleshooting my computer problems until now.

Anyway, I started memtesting some days ago, and I think I have narrowed it down to one of my two memory sticks being the issue, as it produced errors in Memtest, while the other one did not.

However, I have been getting a lot of new bluescreens lately, but with another error message: bad pool header (or sometimes 'bad pool caller'). This seems to be very closely related to my current internet connection method; I'm using a mobile internet USB stick to connect to the internet through my desktop computer. I've also got a laptop connected to my desktop via a normal crossover cable, and through this I'm sharing the internet connection with the laptop. Now, it seems that the BSODs occur almost every time when the crossover cable is already connected to the laptop, and I try to log on to the internet on my desktop. If the crossover cable is not connected, the BSODs do not seem to happen. This means I can probably circumvent the problem by disconnecting the crossover cable before connecting to the internet, but I would appreciate if there was another solution.

I'm currently only using one of my RAM sticks, and even though I can't find any issues with it in Memtest, these BSODs seem to happen anyway. I've also tried several different USB ports for the mobile internet stick, but it doesn't seem to matter.

Attaching a new up-to-date zip file with (hopefully) the info needed.

I would greatly appreciate all help I can get. :)
My System SpecsSystem Spec

11 Mar 2013   #4

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit

Stop using the Huawei dongle. It uses a historic driver, and always problematic with windows7.
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *

Use !analyze -v to get detailed debugging information.

BugCheck C2, {7, 109b, 4410000, fffffa800bebf010}

*** WARNING: Unable to verify timestamp for ewusbwwan.sys
*** ERROR: Module load completed but symbols could not be loaded for ewusbwwan.sys
GetPointerFromAddress: unable to read from fffff800032bc100
GetUlongFromAddress: unable to read from fffff800032bc1c0
Probably caused by : ewusbwwan.sys ( ewusbwwan+2bb5 )

Followup: MachineOwner

2: kd> !analyze -v
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *

The current thread is making a bad pool request.  Typically this is at a bad IRQL level or double freeing the same allocation, etc.
Arg1: 0000000000000007, Attempt to free pool which was already freed
Arg2: 000000000000109b, (reserved)
Arg3: 0000000004410000, Memory contents of the pool block
Arg4: fffffa800bebf010, Address of the block of pool being deallocated

Debugging Details:

POOL_ADDRESS:  fffffa800bebf010 Nonpaged pool


BUGCHECK_STR:  0xc2_7_usbp





LAST_CONTROL_TRANSFER:  from fffff800031b7be9 to fffff80003083c40

fffff880`02ddd808 fffff800`031b7be9 : 00000000`000000c2 00000000`00000007 00000000`0000109b 00000000`04410000 : nt!KeBugCheckEx
fffff880`02ddd810 fffff880`018bc845 : 00000000`00000000 fffffa80`00000000 00000000`00000000 fffffa80`0aa77830 : nt!ExDeferredFreePool+0x1201
fffff880`02ddd8c0 fffff880`0c29fbb5 : 00000000`00000000 fffffa80`0ce14b01 fffffa80`0ceb6010 fffffa80`0a0b2000 : ndis!NdisFreeMemory+0x15
fffff880`02ddd8f0 00000000`00000000 : fffffa80`0ce14b01 fffffa80`0ceb6010 fffffa80`0a0b2000 fffffa80`0ceb6010 : ewusbwwan+0x2bb5


fffff880`0c29fbb5 ??              ???


SYMBOL_NAME:  ewusbwwan+2bb5

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: ewusbwwan

IMAGE_NAME:  ewusbwwan.sys


FAILURE_BUCKET_ID:  X64_0xc2_7_usbp_ewusbwwan+2bb5

BUCKET_ID:  X64_0xc2_7_usbp_ewusbwwan+2bb5

Followup: MachineOwner

2: kd> lmvm ewusbwwan
start             end                 module name
fffff880`0c29d000 fffff880`0c308000   ewusbwwan T (no symbols)           
    Loaded symbol image file: ewusbwwan.sys
    Image path: \SystemRoot\system32\DRIVERS\ewusbwwan.sys
    Image name: ewusbwwan.sys
    Timestamp:        Thu Aug 18 16:32:28 2011 (4E4CF144)
    CheckSum:         0006ABB9
    ImageSize:        0006B000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4
BTW, if you can find updated drivers, you may update it as a test.

Daemon Tools, Alcohol 120% and Power Archiver Pro uses SCSI Pass Through Direct (SPTD), which is a well known BSOD causer. Uninstall the program at first. Then download SPTD standalone installer from, and execute the downloaded file as guided below :
  • Double click to open it.
  • Click this button only:
  • If it is grayed out, as in the picture, there is no more SPTD in your system, and you just close the window.
Free up the startup.
  1. Click on the Start button
  2. Type “msconfig (without quotes), click the resulting link. It will open the System Configuration window.
  3. Select the “Startup” tab.
  4. Deselect all items other than the antivirus.
  5. Apply > OK
  6. Accept then restart.
My System SpecsSystem Spec
11 Mar 2013   #5

Windows 7 Home Premium 64bit

Thanks for your help. I checked the drivers on the USB dongle, and it seemed some of them were from 2006, while others were updated 2011, so I guess that's probably why it gives me trouble. Weird that it works well if I use it with the laptop though. Still, I don't have any other alternative for getting internet currently, so I guess I will have to manage.
My System SpecsSystem Spec
11 Mar 2013   #6

Microsoft Community Contributor Award Recipient

Microsoft Windows 10 Pro Insider Preview 64-bit

Yes if you cannot change the dongle unfortunately you need to adjust with the present situation.
My System SpecsSystem Spec

 BSOD (0x0000001A) randomly during normal use

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