crash, probably defective RAM

[al404]

Since I occasionally have a crash I decided to test my RAM with Rember, it is a GUI fro memtest
While testing it trigger a crash and after restar log was gone

How should I find if I have a faulty stick and witch one is it

panic(cpu 2 caller 0xffffff800c9449ad): userspace watchdog timeout: no successful checkins from WindowServer in 120 seconds
service: logd, total successful checkins since load (4180 seconds ago): 419, last successful checkin: 0 seconds ago
service: WindowServer, total successful checkins since load (4150 seconds ago): 403, last successful checkin: 120 seconds ago
service: remoted, total successful checkins since load (4180 seconds ago): 417, last successful checkin: 0 seconds ago
service: opendirectoryd, total successful checkins since load (4180 seconds ago): 419, last successful checkin: 0 seconds ago

 

[Fishrrman]

When I see a post like this, my questions are:
1. Did you add to or replace the factory-installed RAM?
2. Do you STILL HAVE the factory-installed RAM?
3. What happens if you REMOVE any 3rd-party RAM, and put the factory-installed RAM back in?

 

[Nguyen Duc Hieu]

Since I occasionally have a crash I decided to test my RAM with Rember, it is a GUI fro memtest
While testing it trigger a crash and after restar log was gone

How should I find if I have a faulty stick and witch one is it

Easy.
Test one stick at a time until you find the bad stick.
When one stick is test good on one 1 slot, use that stick to test other slots.

 

[al404]

When I see a post like this, my questions are:
1. Did you add to or replace the factory-installed RAM?
2. Do you STILL HAVE the factory-installed RAM?
3. What happens if you REMOVE any 3rd-party RAM, and put the factory-installed RAM back in?

1 I add 2 stick from Crucial
2 Yes I have the original stick since I just add them
3 it is hard to tell what happen because it is completely random it can take up to a month to get a new crash, I notice that after it happens I gat several crash in a raw

usually are similar to this "panic(cpu 2 caller 0xffffff801af449ad): userspace watchdog timeout: no successful checkins from WindowServer in 120 seconds"

- It seem correlated with temperature, in summer and when is hot I get more
- I suspect it can be related with time machine, running "tmutil thinlocalsnapshots / 999999999999999 4" seems to fix it for a while
- usually happens when iMac star sleeping and monitor gets dark, some times it gets dark and never wakes up but I see TM led blinking, usually I hear fan spinning very fast for less than 1 sec and then crash

I'm moving to a Mac mini because I use my iMac for work and this thing of having a bundled PC with monitor I never really like it in case of issue

Since now Mac mini is no more a less powerful option and since they released Mac studio I'm going back to a different setup