FYI to all with an interest in AMD Ucode. AMD fixed the 'lwp' instruction(s) in a latter ucode update.
-------------------------------------- 2018-05-18 linux-firmware: Update AMD cpu microcode * Add AMD cpu microcode for processor family 17h * Update AMD cpu microcode for processor family 15h * Update the AMD cpu microcode license copyright * Add a Version for both microcode family 15h and 17h https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=77101513943ef198e2050667c87abf19e6cbb1d8 ( sys-kernel/linux-firmware-20180518:0 ) On an AMD FX-9590 , the 'lwp' instruction(s) disappeared. -------------------------------------- 2018-05-25 Update AMD cpu microcode for family 15h * Processor Revision ID 0x00610f01 was accidently not included in the previous submitted microcode container file. * Update the Version for family 15h microcode .bin file https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=7518922bd5b98b137af7aaf3c836f5a498e91609 ( sys-kernel/linux-firmware-20180525:0 ) On an AMD FX-9590 , the 'lwp' instruction(s) reappeared. -------------------------------------- Thanks to the person who fixed this little 'oops'.