[wdmaudiodev] Re: Using KeAcquireInStackQueuedSpinLock

  • From: "Daniel E. Germann" <deg@xxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Mon, 2 Mar 2009 08:08:18 -0600

Hi, KS.
Are you sure the bugcheck happens in the call to KeXxxInStackQueuedSpinLock()? Bug check 0x7e with a first parameter of 0xC0000005 is a memory access violation, which means you might also be dereferencing a bad pointer somewhere. It's been a while since I've debugged one of these, so I'm not 100% sure about this, but the second parameter (0x000CAD66) should be the address of the fault, and it doesn't look like a kernel mode address to me. Are you trying to access something in user-mode memory? 

Take a look at this article, which provides information on this bugcheck.
http://www.osronline.com/ddkx/ddtools/bccodes_192f.htm
Doing an "analyze -v" from windbg will also provide some helpful information.
Also, are you declaring the KSPIN_LOCK structure globally in non-paged memory, and the KLOCK_QUEUE_HANDLE on the stack? 

-Dan
----- Original Message ----- 
Date: Mon, 2 Mar 2009 12:09:18 +0800
Subject: [wdmaudiodev] Using KeAcquireInStackQueuedSpinLock
From: KS <wakeup1504@xxxxxxxxx>

Hi,
Does anyone have any experience in using KeAcquireInStackQueuedSpinLock. the 
recommended way for getting spinlock for WinXP and above.
I'm trying to use this, and it seems that the call will always BSOD with the 
following bugcheck code.

*** Fatal System Error: 0x0000007e
                      (0xC0000005,0x000CAD66,0x8336B6A4,0x8336B3A0)

Here's a short code extract of how I'm calling the function

...
KSPIN_LOCK mySpinLock;
KLOCK_QUEUE_HANDLE  LockHandle;
BOOL acquireAtDpc = FALSE;

KeInitializeSpinLock(&mySpinLock);

if(KeGetCurrentIrql() == DISPATCH_LEVEL)
{
   KeAcquireInStackQueuedSpinLockAtDpcLevel(&mySpinLock, &LockHandle);
   acquireAtDpc = TRUE;
}
else
{
   KeAcquireInStackQueuedSpinLock(&mySpinLock, &LockHandle);
}

....
// Do the protected actions
...

if(acquireAtDpc)
{
   KeReleaseInStackQueuedSpinLockFromDpcLevel(&LockHandle);
}
else
{
   KeReleaseInStackQueuedSpinLock(&LockHandle);
}


Thanks for any advise on what I might be doing wrongly.

KS


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