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Linux Being Patched For Buggy MWAIT Behavior On Intel Ice Lake Servers
The Linux kernel has seen safeguards for select prior Intel CPU cores due to bugs around the MONITOR/MWAIT implementation with the processors
The Linux kernel has seen safeguards for select prior Intel CPU cores due to bugs around the MONITOR/MWAIT implementation with the processors. MWAIT/MONITOR bugs was found to be the cause of annoying issues at boot for Lunar Lake laptops and also previously plagued Goldmont Atom cores. Intel via a specification document update sent out a notice in 2022 that their 3rd Gen Xeon Scalable "Ice Lake" server processors indeed had a known issue where MONITOR may not be triggered that was armed via the MWAIT instruction.
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