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Windows 7: [SOLVED] random BSOD around "ntoskrnl.exe+7cc40"

09 Oct 2011   #1

Windows 7 Professional x64
 
 
[SOLVED] random BSOD around "ntoskrnl.exe+7cc40" - due to bad memory

hello forum,

i just wanted to share the findings regarding my BSOD error symptoms.

to get assistance with troubleshooting you should follow the instructions given in: http://www.sevenforums.com/crashes-d...tructions.html

however, as very basic initial steps i personally prefer this approach:
on my system i was getting sporadic BSOD crashes - each time random stop codes including:
  • DRIVER_IRQL_NOT_LESS_OR_EQUAL
  • IRQL_NOT_LESS_OR_EQUAL
  • KMODE_EXCEPTION_NOT_HANDLED
  • MEMORY_MANAGEMENT
  • PAGE_FAULT_IN_NONPAGED_AREA
  • PFN_LIST_CORRUPT
  • POOL_CORRUPTION_IN_FILE_AREA
  • SYSTEM_SERVICE_EXCEPTION
  • SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
i wasn't able to make out any pattern. the only thing in common was the crash address that would always be "ntoskrnl.exe+7cc40".
in many cases the crash dumps will indicate a particular driv€r to be causing the trouble. but with my system this was not the case.


by coincidence i had identified a pattern how to reproduce a BSOD (by doing certain actions in a pre-defined sequence). so this would allow me to proceed with systematic troubleshooting.


in the end it turned out i was using some defective RAM - or "strange" RAM, at least.
it took me quite a while, because of the following reasons:
  • BSOD seemed to occur randomly / sporadically
  • BSOD was showing random stop codes
  • memtest86+ did not show any erros!

conclusion:
i would recommend the following approach:
  • use memtest86+ to check if there are any "obvious" errors with your RAM
  • use BlueScreenView to check if any device driv€r seems to be causing the error
  • in case you're getting "random" errors like me (as outlined above): take one more closer look at your RAM

in case this still doesn't get you any further: follow the posting instructions to attach the required files. the guys on this forum are doing a great job and will most likely be able to point you in the right direction for additional troubleshooting.

cheers, francoiste


My System SpecsSystem Spec
.

26 Nov 2011   #2

Windows 7 Professional x64
 
 

my memory was showing these strange symptoms due to physical damage.
please see the <attached picture>.

if you look at the photograph it appears just so obvious.
but believe me, you won't detect it with your bare eyes.
you need either a magnifying glass or (as in my case) a high-end photographic camera with super zoom.

note: i'm not sure if this damage was there right from the beginning (DOA) or caused by my excessive testing (adding, removing, swapping the memory modules endless times).

anyhow,
so what's the message?

first: be very careful when inserting your memory modules into the slots.
some brands / modules don't have a very robust design, obviously.

second: the scary part is that neither memtest nor windows detected any errors when doing a memory validation.
the only visible symptoms: the physical damage led to sporadic errors (blue screens) during regular operation.
so it's still very difficult to tell whether a memory module is 100% OK or just 99% OK ...


cheers, francoiste
My System SpecsSystem Spec
15 Dec 2011   #3

Windows 7 64-bit
 
 

you know francoiste I have been having the same blue screens that you had and once in a while the screen freezes with a few lines on it. Now i havent had a blue screen in a few hours, but earlier today I had like 5 and always kmode exception, driver irql, etc... you know what they are because you had them too, and my memory is also checking out ok on memtest. Maybe i should just buy new memory stick but i cant open my computer because i have 39 days left on my warranty from hp and they said if i open it they will not fix it for free... so that is why i cant check out my ram sticks but from what you wrote I really think that i may have a similar problem, the ram came in the computer and they are only 8-9 months old, but i wonder if some dirt or heat in there caused something to happen or maybe one of the sticks is loose or the contacts are dirty. I will let you know what happens!
its weird that now im going for over 4 hours and earlier today i had 5 blue screens in a row then i did a system restore, plus i REINStalled windows 7 yesterday from the 3 dvds that hp sent me and was doing good until today, cpu on all night without a problem then today i got one and 5 more then i do system restore and now ok, so maybe its not my ram it may be an update that was downloaded after I system restored to but if i get another blue screen I will check my ram physically if HP lets me open it up thanks man
James
My System SpecsSystem Spec
.


16 Dec 2011   #4

Windows 7 Ultimate 32 bit
 
 

I guess I may as well have the same issue because everything works fine but whenever I play games, I get BSOD.
My System SpecsSystem Spec
17 Dec 2011   #5

Windows 7 64-bit
 
 

yeah i thought i fixed this problem until today when i get another ntoskrnl error with system service exception, I just checked out my RAM and it looks fine physically now i will run memtest again but i am going to have to send this laptop back to HP, because its almost definitely hardward related and i only have 30 days left on warranty,
My System SpecsSystem Spec
19 Dec 2011   #6

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by francoiste View Post
hello forum,

i just wanted to share the findings regarding my BSOD error symptoms.

to get assistance with troubleshooting you should follow the instructions given in: http://www.sevenforums.com/crashes-d...tructions.html

however, as very basic initial steps i personally prefer this approach:
on my system i was getting sporadic BSOD crashes - each time random stop codes including:
  • DRIVER_IRQL_NOT_LESS_OR_EQUAL
  • IRQL_NOT_LESS_OR_EQUAL
  • KMODE_EXCEPTION_NOT_HANDLED
  • MEMORY_MANAGEMENT
  • PAGE_FAULT_IN_NONPAGED_AREA
  • PFN_LIST_CORRUPT
  • POOL_CORRUPTION_IN_FILE_AREA
  • SYSTEM_SERVICE_EXCEPTION
  • SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
i wasn't able to make out any pattern. the only thing in common was the crash address that would always be "ntoskrnl.exe+7cc40".
in many cases the crash dumps will indicate a particular driv€r to be causing the trouble. but with my system this was not the case.


by coincidence i had identified a pattern how to reproduce a BSOD (by doing certain actions in a pre-defined sequence). so this would allow me to proceed with systematic troubleshooting.


in the end it turned out i was using some defective RAM - or "strange" RAM, at least.
it took me quite a while, because of the following reasons:
  • BSOD seemed to occur randomly / sporadically
  • BSOD was showing random stop codes
  • memtest86+ did not show any erros!

conclusion:
i would recommend the following approach:
  • use memtest86+ to check if there are any "obvious" errors with your RAM
  • use BlueScreenView to check if any device driv€r seems to be causing the error
  • in case you're getting "random" errors like me (as outlined above): take one more closer look at your RAM

in case this still doesn't get you any further: follow the posting instructions to attach the required files. the guys on this forum are doing a great job and will most likely be able to point you in the right direction for additional troubleshooting.

cheers, francoiste

Thanks Francoiste,

I have had the same issue about 10 times with "ntoskrnl.exe+7cc40" being the culprit every time. I checked my systems and noticed that the mobo was only recognizing 4 GB of RAM (I have three sticks of 2GB installed), and sure enough after testing each stick I found one that was faulty. Like you said before, the memtest86+ does not detect this.
My System SpecsSystem Spec
01 Apr 2012   #7

Windows 7 Professional x64
 
 

in post #2 i had attached some photos that nicely show the physical damage of the memory modules.
it took me quite some time to generate those photos.

i just noticed they are gone! who deleted my attachments? and why?
My System SpecsSystem Spec
01 Apr 2012   #8

Windows 7 Home Premium 64 Bit
 
 

It was probably done to clean up space on the server. I believe as threads get older, the attachments are automatically cleaned up or the administrators manually clean them up. I suspect the former.
My System SpecsSystem Spec
03 Apr 2012   #9

Windows 7 Professional x64
 
 

well, i do understand that it makes sense to regulary purge chrash dump files uploaded for the purpose of individual troubleshooting.

however, i'm convinced that my pictures of the memory modules will remain "interesting" for a couple of years, at least.

actually, i'm not really willing to contribute anything further as long as either some moderators will edit my posts (has happened in the past) or whatever kind of mechanism is deleting my file attachments (as discussed here).
that's an absolute show-stopper.

anyhow, for now i'm adding the pictures once more. <please see file attachment>
My System SpecsSystem Spec
03 Apr 2012   #10

Windows 7 Home Premium 64 Bit
 
 

I have informed an administrator about the missing attachments.
My System SpecsSystem Spec
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 [SOLVED] random BSOD around "ntoskrnl.exe+7cc40"




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