[vbox-dev] VBOX_HGCM_REQ_CANCELLED returned?

Huihong Luo huisinro at yahoo.com
Fri Aug 1 20:08:32 GMT 2008

I am trying to do a guest addition driver to traverse the host folders, (similar to VBoxSF). Sometimes, when traversing a large folder (e.g., c:\windows\system32), I got an error code from VbglHGCMCall() with VERR_VBGL_IOCTL_FAILED.
I digged a bit into the VBoxGuest.sys, and found out the root cause was due to 
VbglHGCMCall() in HGCMInternal.c returning the following code:
This error does not occur when debugging. It seems that it only occurs when intensive opertations are performed. When I traverse the host c:\windows\system32, the error occurs for several items from total of about 3000 dir entries.
Any ideas? Due to the host side not responding on time?
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