- Hanging process...
- Posted by Nadav on October 31st, 2005
Hi,
- I have written a function driver that communicate with a user-mode
application, on some scenarios after unloading the function driver ( using
the ServiceManager ) the user-mode process hangs and cannot be terminated
using the task manager or procexp.
- The user-mode app communicate with the driver using a symbolic link and IO
completion mechanism, a CSQ accumulate user-mode Read IRPs and complete them
when it need to report messages to the user.
- Upon termination all of the IRPs in the CSQ are being canceled ( through
the DeviceClose handler or by the IO Manager upon thread termination ).
What may cause the user-mode app to hang?
Any help would be appreciated…
Naddav
http://www.sophin.com
- Posted by Ivan Brugiolo [MSFT] on October 31st, 2005
One possibility:
there is user-mode thread blocked in a wait function with the Kernel-mode
flag set.
This prevents the thread from dispatching the KILL-APC
that is posted to the queue of that thread till the wait is statified.
If you could post `!process <EPROCESS> F` of the zombie process,
possibly more set of eyes can help.
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"Nadav" <Nadav@discussions.microsoft.com> wrote in message
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- Posted by Maxim S. Shatskih on October 31st, 2005
Do you forget to cancel all IRPs in the DriverUnload routine?
--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com
"Nadav" <Nadav@discussions.microsoft.com> wrote in message
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- Posted by Nadav on October 31st, 2005
Shouldn't this be done automatically by the IO Manager when the thread that
issued the IRP is being terminated?
--
Nadav
http://www.sophin.com
"Maxim S. Shatskih" wrote:
- Posted by Don Burn on October 31st, 2005
No you should be doing it.
--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
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"Nadav" <Nadav@discussions.microsoft.com> wrote in message
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- Posted by Ali on October 31st, 2005
Don! are you talking about IoDeleteSymbolicLink and IoDeleteDevice?
Regards.
- Posted by Don Burn on October 31st, 2005
No, I am referring to the fact that every IRP that is queued needs to be
canceled or completed before the driver is unloaded. If a thread is killed,
there should be a cancel call for that IRP which has to be handled.
--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
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