Mac trustd high CPU

from blog The Desolation of Blog, 11 May 2021 | ↗ original

Six months after the Mac OCSP appocalypse, here we go again, and here I go again. Back then I discovered that the trustd process was having trouble connecting to ocsp.apple.com, an issue temporarily solved by preventing connection attempts to that domain (for example in Little Snitch). Yesterday I started noticing another issue with trustd, but this time the issue was a little different: very high CPU usage. I've heard from several other people who started noticing the same issue yesterday too, one of whom helpfully referred me to this reddit thread with even more reports. On investigation, I found that the nsurlsessiond process was connecting to the server valid.apple.com, and immediately afterward trustd CPU jumped from 0% to 100%. It seems that the issue can be temporarily solved by preventing nsurlsessiond from connecting to valid.apple.com. You may have to reboot or force quit trustd to get its CPU usage back to normal. It's important to note that this is only a temporary workaround to the CPU usage problem; trustd is an important macOS system process that checks certificate validity and revocation status, so you probably don't want to block valid.apple.com forever.

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Mac trustd high CPU

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