Re: Xenvif non-zero byte assertion error during teardown

[Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>]

Hello,

On 06/07/2026 09:51, Durrant, Paul wrote:
>> struct _XENVIF_FRONTEND (and likely other structs) are in general full
>> of similar padding. So the ASSERT(IsZeroMemory(Frontend)) check is too
>> strict in most cases.
>>
>> I think current IsZeroMemory asserts should either be removed or
>> converted to a print-only warning.
> 
> What's wrong with zeroing the struct on allocation (which is what is supposed 
> to happen)?
> 

Struct padding bytes have unspecified values and compilers are free to 
emit code that overwrite them even if we don't access them directly. So 
even if a structure was zeroed on initialization, its padding can't be 
guaranteed to remain zero on teardown.


--
Ngoc Tu Dinh | Vates XCP-ng Developer

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