Cyg32 on Win64 fails with stack-protector

Ford, Brian brian.ford@flightsafety.com
Wed Jun 20 17:21:00 GMT 2018


She means a binary search of source revisions to isolate when the problem was first introduced. 
-- 
Brian Ford - Systems Architect
FlightSafety Visual Systems 

> On Jun 20, 2018, at 11:51 AM, Ben RUBSON <ben.rubson@gmail.com> wrote:
> 
>> On 29 May 2018 18:59, Corinna Vinschen wrote:
>> 
>> Hi Ben,
>> 
>>> On Apr 27 19:12, Ben RUBSON wrote:
>>> Hi,
>>> 
>>> We are facing an issue with Cygwin 2.10 32 bits running on Windows 64 bits.
>>> 
>>> Issue was found running EncFS FUSE FS using WinFsp.
>>> 
>>> When forking, and calling StartServiceCtrlDispatcher, program fails with
>>> 0xC0000028 / STATUS_BAD_STACK.
>>> 
>>> Testing several Cygwin versions reveals that issue was introduced between
>>> 2017-11-14 and 2017-12-01.
>>> And Bill (WinFsp author) found that compiling with -fno-stack-protector
>>> works around the issue.
>>> 
>>> There you can then find the full story and Bill's nice investigation :
>>> https://github.com/billziss-gh/winfsp/issues/161
>>> 
>>> Could it be possible something went wrong with Cygwin ?
>>> 
>>> Thank you very much for your support !
>> 
>> Even with Bill's additionl info I have no idea what change in the
>> above time frame might be the culprit, especially since no change
>> has been made to stack handling.
>> 
>> I suggest to build your own Cygwin and bisect it.
> 
> Corinna, could you elaborate please ?
> I'm not sure to clearly understand what you mean by bisecting Cygwin.
> 
> Thank you !
> 
> Ben
> 



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