On 2/26/2026 9:04 PM, KENNON J CONRAD wrote:
Perhaps something like this? Maybe I need to try a BIOS update?
Yes, something *like* these flaws. The thing is to find out if your specific processor has a flaw that needs an update, etc.
Intel Haswell (and related architectures) processors may experience stability issues, including machine check errors (MCEs), due to a microcode bug related to REP MOVS (specifically REP MOVSB or REP MOVSQ) handling. These issues often cause system crashes or lockups, leading to microcode, BIOS/UEFI updates to resolve them. Debian Wiki +4 Issue: A high-rate of interrupts or specific memory operations can cause REP MOVS instructions to trigger Machine Check Errors (MCE) or internal errors (IERR) on older processors. Affected Processors: The bug primarily impacts older Intel processors, including Haswell and Broadwell architectures. Fix/Mitigation: The primary solution is to apply the latest motherboard BIOS/UEFI update, which contains the corrected microcode update (often labelled 20180108 or later). Background: This is linked to Intel’s efforts to fix security vulnerabilities (like Spectre), where early patches for Haswell/Broadwell caused unexpected instability, requiring further refinements. Debian Wiki +4 -Kennon
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