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Subject: Re: mmap failure [was: cygrunsrv + sshd + rsync = 20 times too slow
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From: Ken Brown via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Ken Brown <kbrown AT cornell DOT edu>
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On 9/6/2021 11:34 PM, Brian Inglis wrote:
> On 2021-09-06 15:24, Ken Brown via Cygwin wrote:
>> On 9/6/2021 4:54 PM, Peter Dons Tychsen wrote:
>>> Hi there,
>>>
>>> On Mon, 2021-09-06 at 14:40 -0400, Ken Brown via Cygwin wrote:
>>>>> No, wait.  I get what you say.  The optimzation settings of the test
>>>>> case should have no influence on the code inside the DLL.  That
>>>>> doesn't
>>>>> make sense for sure.  However, I ran the testcase under GDB, I could
>>>>> reproduce the issue, and I could fix it by setting mmap_ext.Reserved
>>>>> = 0;
>>>>> Go figure!
>>>>
>>>> I don't get it, but I can confirm that the problem is fixed.
>>>
>>> That sounds a bit like a voodoo fix, that could quickly regress again.
>>>
>>> Here is my 2 cents:
>>>
>>> Currently the mmap_ext structure is setup like this:
>>>
>>>   215       MEM_EXTENDED_PARAMETER mmap_ext = {
>>>   216         .Type = MemExtendedParameterAddressRequirements,
>>>   217         .Pointer = (PVOID) &mmap_req
>>>   218       };
>>>
>>> This means that all other entries in the struct are zero at
>>> initialization as described here:
>>> https://en.cppreference.com/w/c/language/struct_initialization
>>>
>>> So if you set "mmap_ext.Reserved = 0" again after that its a double
>>> failure.
>>
>> You're looking at the wrong source code.  The bug didn't occur until the code 
>> was changed to do the following:
>>
>>        /* g++ 11.2 workaround: don't use initializer */
>>        MEM_EXTENDED_PARAMETER mmap_ext;
>>        mmap_ext.Type = MemExtendedParameterAddressRequirements;
>>        mmap_ext.Pointer = (PVOID) &mmap_req;
>>
>> This left mmap_ext.Reserved uninitialized, which Corinna has now fixed.
> 
> With undocumented structure member initialization an issue, maybe better to 
> future proof using e.g.
> 
>      MEM_EXTENDED_PARAMETER mmap_ext = { 0 }; // or memset or bzero

I don't see what this would accomplish.  We're already initializing every member 
after Corinna's last patch.

Ken

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