PM864 - 4102 irq err

Hi everyone!

I had a problem with my PM864A configured in redundant mode. Both CPU's stopped.

At first, the log recorded the following issues:

E 2020-03-19 11:02:45.629 cicomdrv BUSERROR at module 2 address 401406f4
I 2020-03-19 11:02:45.632 867 GetDevStat1: drv or COM error 2 11020 0 CI854StatusBase.cpp
E 2020-03-19 11:02:45.653 cicomdrv BUSERROR at module 2 address 401406f8
I 2020-03-19 11:02:45.658 887 GetDevStat2: drv or COM error 2 11020 0 CI854StatusBase.cpp
W 2020-03-19 11:02:45.664 On Unit= 1 HWError ECP502~_PB1_HW 0000 See HWTree Error 16#00120000 16#40040000
E 2020-03-19 11:02:45.718 cicomdrv BUSERROR at module 2 address 401406f4
E 2020-03-19 11:02:45.721 cicomdrv BUSERROR at module 2 address 401406f8
E 2020-03-19 11:02:45.778 cicomdrv BUSERROR at module 2 address 401406f4
E 2020-03-19 11:02:45.781 cicomdrv BUSERROR at module 2 address 401406f8
E 2020-03-19 11:02:45.800 cicomdrv BUSERROR at module 2 address 401406f0
E 2020-03-19 11:02:45.801 766 CEX bus no resp 2 0 0 CI854StatusBase.cpp
W 2020-03-19 11:02:45.802 On Unit= 1 HWError ECP502~_PB1_HW 0000 See HWTree Error 16#00120000 16#50040000
E 2020-03-19 11:02:45.838 cicomdrv BUSERROR at module 2 address 401406f4
E 2020-03-19 11:02:45.841 cicomdrv BUSERROR at module 2 address 401406f8
I 2020-03-19 11:02:45.844 279 Get DriverSema 2 0 0 CI854ConfigBase.cpp
I 2020-03-19 11:02:45.849 1731 CPhCI854Base::PrepareForTerminat 2 0 0 CI854ConfigBase.cpp
I 2020-03-19 11:02:45.853 8828 ciVariant = 2 0 0 PhCI854.cpp
I 2020-03-19 11:02:45.860 1783 Reset CI with cmd = A 0 0 CI854ConfigBase.cpp
E 2020-03-19 11:02:45.865 cicomdrv BUSERROR DETECTED at address 40100000
I 2020-03-19 11:02:45.870 1799 Reset CI with cmd = A 0 0 CI854ConfigBase.cpp
I 2020-03-19 11:02:45.907 331 Could not read ErrorMem 2 0 0 CI854ConfigBase.cpp
W 2020-03-19 11:02:46.309 On Unit= 1 HWError ECP502~_PB1_HW 0000 See HWTree Error 16#00120000 16#50000000

After that, I had the following register:

I 2020-03-19 11:02:46.743 ... flushed 1 messages (first message might be repeated)
E 2020-03-19 11:02:46.508 ErrorHandler PM: 4102 irq err (1,2)
This PM has been intentionally stopped.
Reason:
- CPU stall timer has expired (Acknowledged)
- Manual shutdown was requested, error code : 4102
Press init button or remove power to restart...

I had to remove the power supply of the controllers and download again.

Please, could somebody help me to understand what happened in that event?

Thank you.