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This is a Sierra box, the system memory was suddenly out of usage. I have checked the system to find out that the keychain process was busy and used nearly all the memory.
I had to reboot the system, then i opened keychain to see the login items list is flashing, one unknown item in login keychain was keeping being deleted and inserted.
Want to know why, I opened activity monitor, then got to know assistantd was busy doing that. I killed the process, the keychain came to be in peace.
I think the process is used by Siri, as assistantd process came out again after I clicked the siri icon.

Even I do not use siri, I want to know why this could happen, and what is the real solution.

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  • Are the processes you killed running as your log in user or as root / another system users? If user process, consider making a new user and letting the assistants to complete all the way and remeasure.
    – bmike
    Nov 12 '16 at 14:15
  • The process was running as login user. I have created another user, the keychain is fine with siri. But then login back, the problem remains the same. I had to disable siri.
    – sanigo
    Nov 12 '16 at 14:54
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The problem is solved. I have searched in ~/Library for all the directories and files within has siri or assistant in their names, and removed them all.
Then reboot, all are fine then!

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  • That's a pretty broad stroke, but it got me looking at removing ./Assistant/com.apple.siri.applications.laststate.plist... I'll see if it helps and update again.
    – benc
    Dec 11 '18 at 22:06

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