!findfilelockowner
The !findfilelockowner extension attempts to find the owner of a file object lock by examining all threads for a thread that is blocked in an IopSynchronousServiceTail assert and that has the file object as a parameter.
!findfilelockowner [FileObject]
Parameters
FileObject
Specifies the address of a file object. If FileObject is omitted, the extension searches for any thread in the current process that is stuck in IopAcquireFileObjectLock and retrieves the file object address from the stack trace.
DLL
Kdexts.dll
Additional Information
For information about file objects, see the Microsoft Windows SDK documentation, the Windows Driver Kit (WDK) documentation, and Microsoft Windows Internals by Mark Russinovich and David Solomon.
Remarks
This extension is most useful after a critical section timeout in which the thread that times out was waiting for the file inside IopAcquireFileObjectLock. After the offending thread is found, the extension attempts to recover the IRP that was used for the request and to display the driver that was processing the IRP.
The extension takes some time to complete because it walks the stack of all threads in the system until it finds the offending thread.You can stop ` at any point by pressing CTRL+BREAK (in WinDbg) or CTRL+C (in KD).
See also
Critical Section Time Outs (user mode)
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