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Windows 7: Windows 7 PC freezes with LAN access

31 Oct 2009   #11


Quote   Quote: Originally Posted by H2SO4 View Post
Quote   Quote: Originally Posted by torrentg View Post
Quote   Quote: Originally Posted by jjero View Post
You were right
Statistics have shown this to be true on most, if not all occasions. Good one H2S04.
Thank you sir. The School of Hard Knocks is a very prestigious learning institution
I should explain the method behind the madness because this is a common scenario...

The "does the mouse move" question is actually much more important, and the answer is much more telling than it perhaps seems. Deep in the guts of the OS lies a prioritisation mechanism based around the "interrupt request level" (IRQL).

Everything that can be termed an "application" always runs at the lowest possible IRQL - 0 (zero), also called "passive" IRQL. Above 2 lie the so-called "Device IRQL" (DIRQL) levels assigned to particular hardware peripherals. For the sake of the argument, say the USB mouse works at IRQL=2 and the PS/2 keyboard is assigned (say) 17.

There's a very interesting rule which says that once the processor is running at an elevated (non-passive) IRQL, it cannot be interrupted by any tasks whose IRQL is less than or equal (sound familiar? IRQL_NOT_LESS_OR_EQUAL). The kernel's own "dispatcher" which chooses which thread will run next runs at IRQL=2. Hence, if something should cause the IRQL to go to 2 or above for extended periods of time, even the dispatcher will be unable to run until the IRQL comes back down below 2.

The key point is that you have to be a kernel-mode component in order to raise the processor IRQL. In other words, you're either the kernel itself, one of the OS drivers, or a 3rd-party driver. Apps and code running in user-mode are completely prevented from messing about with this stuff.

In this instance, the fact that the mouse pointer wasn't moving was strongly suggestive of a hang which occurred at elevated DIRQL above that of a (USB or PS/2) mouse. Something had raised IRQL to a high level and then gotten stuck, to the detriment of the rest of the OS which was no longer able to obtain processor time.

By a process of elimination, it's not the OS or it would be happening to all of us. Hence, it's a 3rd-party driver running in kernel-mode. Which 3rd-party driver? Obviously, one which would be interested in the fact that somebody had just attempted to access a share.... some type of "security" driver.... the AV or a 3rd-party firewall.

My System SpecsSystem Spec
31 Oct 2009   #12

7600.20510 x86

That explanation does in fact demystify IRQL_NOT_LESS_OR_EQUAL to me. At least I have basic understanding when before I had none at all.
My System SpecsSystem Spec
31 Oct 2009   #13

Windows 7 Professional 64bit

Thanks for the help!
My System SpecsSystem Spec

31 Oct 2009   #14

Windows 7 Professional 64bit

Whoops, accidental post.
My System SpecsSystem Spec
29 Nov 2009   #15

Windows 7 Professional 64bit

hello again (bump)

I have been having the same freezing issue again since a couple days ago. (windows 7 freezing completely when it is accessed by another windows 7 pc or vice versa) I haven't installed anything new. The freezing increased in frequency until it started freezing every time the computer was accessed. I then uninstalled media browser (media browser) because I thought its the only unusual program i have to explain the unusual crashing symptoms. This actually stopped the freezing....for ~24 hours, and then the whole cycle started again and at present it is freezing every time again.

I tried all the previous tips (uninstalling avast, safe mode with networking etc) but they don't help.

System specs are the same.
My System SpecsSystem Spec
29 Nov 2009   #16

Windows 7 Professional 64bit


Just formatted and reinstalled windows 7 on both computers. The freezing still occurs on the same computer with both computers running vanilla windows 7.

Does this mean its a hardware problem?
My System SpecsSystem Spec
29 Nov 2009   #17

7600.20510 x86

Visit the manufacturer's site of the new HDD and see if there are any firmware updates for it. I see on Google that there are!

If you go to apply one, backup the data on the HDD first. There is a chance it will be wiped out with a firmware update.

Make sure that there is no physical jumper on the drive set.

Check that this is right for your drive and install it.
My System SpecsSystem Spec
01 Dec 2009   #18

Windows 7 Professional 64bit

I have the firmware cc37 (It seems to be the latest?). When I enter my serial number (9VP21P3E) it gives me the message "No download available for this serial number" . I've done some basic tests using the seatools program from seagate but no errors come up.

Some extra info: when I transfer files between a vista laptop and the freezing computer, there are no problems.
Also, there doesn't seem to be any freezing with small files (e.g. word documents).

I'm going to get access to another windows 7 computer in a couple days so I'll see what happens.

Thanks again for the reply.

EDIT: some more (confusing?) info: with 1GB, 2GB and 3GB of RAM plugged in I get an entirely different problem - the network dies (a cross goes over the computer icon and I can't access the internet or view the network. Auto-troubleshoot doesn't help), but I can still use the computer i.e. no freezing. So the freezing problem only occurs with 4GB of RAM. I will run memtest86 now.
My System SpecsSystem Spec
01 Dec 2009   #19

Windows 7 Professional 64bit

No errors on memtest86
My System SpecsSystem Spec

 Windows 7 PC freezes with LAN access

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