Hello, what part of the solution were you able to use on SEP 11 and what exact build do you have? I don't think KStackMinFree  in the registry is anything that SEP 11.x supports but I will have to confirm. The other solutions with OS hotfixes and driver updates could help though.

We had the exact issue described in the article at the time we were using SAV 9 couple of years ago. we updated kstackmimnfree value on all our server to prevent the issue.

We deployed SEP 11 RU6 about two years ago, I have not seen any servers experienced the issues, I think you can safely start your SEP deployment.

We have few servers with SEP 11.0.5002.333 version with a similar issue. We installed a whitelisting application(Bouncer)  which uses a kernel drivers. The server crash when we move the server to unsecured mode. This action triggers the crash event, appears to cause SEP  to request additional stack memory. Ther Bug Check error is not the same as described in the article but the solution did work for me.

I found if I add the registry to SEP 11 then the server wont t crash.

 This Registry key is for a 2003/2008  R2 x64 server.

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Symantec\Symantec Endpoint Protection\AV\Storages\Filesystem\RealTimeScan]

"KStackMinFree"=dword:00002200