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

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> -----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
analyzing
> 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,
LowPagePriority);
>        if (!va)
>        {
>          KdPrint((__DRIVER_NAME "     failed to map buffer va -
partial
> send\n"));
>          coalesce_remaining = 0;
>          remaining -= min(PAGE_SIZE, remaining);
>          NdisFreeToNPagedLookasideList(&xi->tx_lookaside_list,
> coalesce_buf);
>        }
>        else
>        {
> 

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?

James

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