ISTAT MENUS CHANGE TO CLESIUS UPDATE
I may update this post (again) later if I have more details, but for now let’s start with the whats and hows: Context It annoys me to no end that I only noticed this was an issue due to my having tried to pick my network when doing Internet Recovery, which helped pin things down. * The year-on-year changes to Console.app (and the glacial slowness of the machine when stalling) made it very hard to spot patterns in logs.Īnd, of course, I have to get work done, so working through all the possible permutations was very slow. * The Wi-Fi icon was moved from the menu bar into Control Center (so status changes and error flashes are invisible). * I have a Gigabit Ethernet connection (so I only have Wi-Fi on for Continuity). But the reason I failed to notice this over the course of two weeks of trial and error troubleshooting is manifold:
Summary: Every time I try to join that network, kernel_task immediately goes into a spin lock burning CPU cycles across all cores and stalling the machine, with variations of these two lines in the logs: ARPT: 2859.550473: wlc_phy_rx_iq_est_acphy: SPINWAIT ERROR : IQ measurement timed outĪRPT: 2859.550487: wl0: fatal error, reinitializing, total count of reinit's, Learned: I should have been even more systematic. Update, three weeks after the Big Sur 11.4 upgrade: Long story short, my current working theory is that 11.4 rendered my Wi-Fi card unable to associate to my 5GHz network (which is all based on Apple Airport Extremes), and that there is a macOS kernel bug that handles this situation very poorly. 15 min read The Big Sur kernel_task Troubleshooting Sagaįollowing last week’s post regarding my kernel_task woes (which began nearly two weeks ago now), I decided to strip out the updates from that post and consolidate them here with a little more detail.
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