cygrunsrv.exe with csrss.exe cause 100% system load with API-Call

[Patrick Lichtner <patrick dot lichtner at avira dot com>]

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Hi All,

we are an antivirus vendor and customers can't update our software with
OpenSSH for Windows (cygwin1.dll v 1005.10.0.0) running:

The cygwin process "cygrunsrv.exe" together with the Microsoft
Client/Server Runtime Server Subsystem ("csrss.exe") cause the load as
soon as our "update.exe" is triggered.

We do NOT touch any of these processes with updater or scanner. So
there's NO chance to exclude anything here. WHAT we do is to browse all
processes for explorer to find the current users desktop before starting
our apps. This is done only on NT/W2K. We perform a
FindFirstProcess()/FindNextProcess(). So we simply created a testapp
which caused the same effect: If this tool is started, cygwin or csrss
needs 100% of the CPU. The tool use only windows API calls and so the
described behaviour is a bug in CYGWIN.
Examples can be also taken from the MSDN help (ProcessList). As soon as
the API Call "Process32First" is called and the process "csrss" is
attached, the CPU gets 100%. The process list is required by us for
different tasks.

So what can we do? Thanks in advance for your feedback.

Kind Regards,
Patrick Lichtner
Avira GmbH
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