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Re: [Xen-devel] RE: BSOD in GPLPV rev928 in xennet.sys

-----Original Message-----
From: Andreas Kinzler [mailto:ml-xen-devel@xxxxxx]
Sent: Thursday, 9 June 2011 04:38
To: xen-devel@xxxxxxxxxxxxxxxxxxx; James Harper
Subject: BSOD in GPLPV rev928 in xennet.sys

Hello James,

on Windows 2008 R2 SP1 I get a BSOD on GPLPV setup. After some
I found that it is a "null ptr read" in the call to
NdisFreeToNPagedLookasideList. File is xennet6_tx.c line 336.

        length = XenNet_QueryData(&pi, coalesce_remaining);
        va = NdisBufferVirtualAddressSafe(pi.curr_mdl,
        if (!va)
          KdPrint((__DRIVER_NAME "     failed to map buffer va -
          coalesce_remaining = 0;
          remaining -= min(PAGE_SIZE, remaining);

I can't see how that situation could arise without there being some
memory corruption somewhere... coalesce_buf is checked for NULL before
the call to NdiFreeToNPageLookasideList. Did you get the "Failed to map
buffer va - partial send" message in the logs?

I am not running any debuggers, I got the information from analyzing disassembled code listings and the minidump. I may have a look at debuggers (my time is somewhat limited).

Would you consider the rev928 version stable? What is the latest stable version in your opinion?

Regards Andreas

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