unexpected shutdown of iMac Pro

[whwang]

Hi,

In the past few days, there were two abnormal/unexpected shutdowns of my iMac Pro in my office. Daytime usages were all normal. In two of the past few nights, it shut itself down (so it was off when I entered the office in the next morning). Below I attach the first few lines of the crash report generated by MacOS. It seems it's sleep or power related. Unfortunately my computer knowledge is not good enough to understand exactly what went wrong and what can be done to prevent this from happening again. Can anyone tell what's going on?

Thanks.


panic(cpu 0 caller 0xffffff80017944ae): Sleep transition timed out after 180 seconds while calling power state change callbacks. Suspected bundle: com.apple.driver.AppleAHCIPort. Thread 0x176171.
Backtracing specified thread
Panicked task 0xffffff90a7b0cfd8: 370 threads: pid 0: kernel_task
Backtrace (CPU 0), panicked thread: 0xffffff9a2e9d80c8, Frame : Return Address
0xffffffe2a1ac3790 : 0xffffff8001175657
0xffffffe2a15b3be0 : 0xffffff80010547f6
0xffffffe2a15b3c70 : 0xffffff80010528f0
0xffffffe2a15b3cc0 : 0xffffff8001172580
0xffffffe2a15b3d00 : 0xffffff8001171d6b
0xffffffe2a15b3d40 : 0xffffff800170ec08
0xffffffe2a15b3d70 : 0xffffff8001711c79
0xffffffe2a15b3dd0 : 0xffffff800204af9f
0xffffffe2a15b3e00 : 0xffffff80016f3a79
0xffffffe2a15b3e70 : 0xffffff80016f37dc
0xffffffe2a15b3ea0 : 0xffffff8001081bc8
0xffffffe2a15b3ee0 : 0xffffff8001082c58
0xffffffe2a15b3fa0 : 0xffffff8000fbf19e
Kernel Extensions in backtrace:
com.apple.driver.AppleAHCIPort(380.0)[53700DCF-DD39-3593-85BC-BD6CED648A73]@0xffffff8002044000->0xffffff8002052fff
dependency: com.apple.iokit.IOAHCIFamily(304)[C85EF159-2AD1-39B0-A48A-684E6B828316]@0xffffff8002eff000->0xffffff8002f0efff
dependency: com.apple.iokit.IOPCIFamily(2.9)[43511668-C040-3FBA-8CD6-25AD6E00FD90]@0xffffff8003368000->0xffffff8003399fff

Process name corresponding to current thread (0xffffff9a2e9d80c8): kernel_task

Mac OS version:
23F79
....... (report truncated here)

 

[Significant1]

Try disconnecting everything you might have attached.

 

[whwang]

Try disconnecting everything you might have attached.

Thanks. Do you imply that this is caused some of the external devices?

 

[Significant1]

Thanks. Do you imply that this is caused some of the external devices?

It’s a usual suspect and highly likely. Besides when searching for the cause to a problem, you must start to try and isolate it.

Maybe a bigger section of the crashlog would tell more, but I am not sure.