Firefly and PC GAMESS-related discussion club


 
Learn how to ask questions correctly  
 
 
We are NATO-free zone
 


Issues with running Firefly on Intel Cannonlake, Goldmont Plus or AMD Ryzen 3000 "Zen 2" processors.

FF admin
firefly@classic.chem.msu.su

Dear FF Users,

When Firefly is launched on newest Intel or AMD CPUs under Linux, users can experience immediate program crash with SIGSEGV signal, accompanied by the appearance of the following lines in kern.log:

......... SLDT(SGDT) instruction cannot be used by applications.

This is because the User-Mode Instruction Prevention (UMIP) functionality on newer processors prevents these instructions from executing in user-mode. The issue should be fixed in the new Linux kernels version > 5.4. The workaround is to disable the UMIP functionality by loading the kernel with clearcpuid=514 option.

Hope this helps.

Kind regards,
Firefly Project Team.

[ Previous ] [ Next ] [ Index ]           Wed Aug 12 '20 7:46pm
[ Reply ] [ Edit ] [ Delete ]           This message read 1193 times