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Reminds me of that time when, a good few years ago, I woke up to a flurry of monitoring alerts reporting that every single kernel.org system went offline. After hours of scrambling, I managed to track it down to an automatically applied selinux package update that depended on another update in rsyslog that wasn't marked as "security" and so wasn't applied in the same transaction. This caused rsyslog to wedge, and if syslog calls are not returning, that puts the entire system into a massive gridlock.

Anyway, that was the end of automatic OS updates on all critical path systems.
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