[Interest] qt and Windows tolerance heap

maitai maitai at virtual-winds.org
Tue Sep 7 20:05:49 CEST 2021

OK, thanks. I will not attempt to modify the registry. I just want to 
know if that is the case and eventually display a warning.

The key for that is 

Now I want to test my changes, I have already forced more than 100 
crashes in the hope Windows will move me to FTH, no luck :)


Le 07-09-2021 17:17, Scott Bloom a écrit :

> You shouldn't need it for a read of the registry, however it is 
> possible that the IT dept of the user, or the user themselves has 
> escalated the default privileges required to read from HKLM
> You might want to code your check to allow for a security violation, so 
> the is it enabled would be yes, no, or "I cant tell" response.
> Scott
> From: Interest <interest-bounces at qt-project.org> On Behalf Of maitai
> Sent: Tuesday, September 7, 2021 7:36 AM
> To: Interest at qt-project.org
> Subject: Re: [Interest] qt and Windows tolerance heap
> Thank you very much that is the way. Do you know if elevated privileges 
> are needed to do that?
> --Philippe
> Le 07-09-2021 15:22, Jérôme Godbout a écrit :
>> You can put your aplicaiton into the exclude list, sorry though it was 
>> mentionned into the microowft page, but here is the registry key:
>> HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\FTH\ExclusionList\myapp.exe
>> Change myapp.exe for your actual application.
>> From: Jérôme Godbout <jgodbout at dimonoff.com>
>> Date: Tuesday, September 7, 2021 at 9:07 AM
>> To: maitai <maitai at virtual-winds.org>, Interest at qt-project.org 
>> <Interest at qt-project.org>
>> Subject: Re: [Interest] qt and Windows tolerance heap
>> The tolerant heap only make workaround for actual bug. Disable the 
>> tolerant heap for your developers (this should be a system options 
>> when developer mode is enabled directly into Windows but sadly you 
>> have to do it manually). This will show where your bug is and will 
>> appear on dev workstation before they appear on the clients.
>> The "myth" of try to launch it again on windows is not really a myth, 
>> it come from this feature, the OS try to fix the heap allocation, but 
>> the application is still broken. You can also disable your application 
>> from using it during the installer.
>> To disable:
>> https://docs.microsoft.com/en-us/windows/win32/win7appqual/fault-tolerant-heap?redirectedfrom=MSDN
>> From: Interest <interest-bounces at qt-project.org> on behalf of maitai 
>> <maitai at virtual-winds.org>
>> Date: Tuesday, September 7, 2021 at 5:32 AM
>> To: Interest at qt-project.org <Interest at qt-project.org>
>> Subject: [Interest] qt and Windows tolerance heap
>> Hi,
>> I have some users (mainly beta testers) that are suffering from 
>> "Windows Tolerant Heap" 
>> (https://docs.microsoft.com/en-us/windows/win32/win7appqual/fault-tolerant-heap). 
>> The consequence of this being activated after some crashes is that the 
>> application becomes very slow, plus some mysterious crashes occur 
>> randomly deep inside qt event queue manager.
>> I know how to remove the app from Tolerant Heap with an elevated 
>> command prompt.
>> My question is: is there a way from inside the application to detect 
>> the app is running in this mode, so I can prompt the user to contact 
>> us for instance?
>> Thanks for any insight
>> Philippe Lelong
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