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PANIC: Uncorrectable Machine Check Error at CPUX on FAS9500/AFF A900

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Applies to

  • FAS9500
  • AFF A900
  • ONTAP 9.11.1P4

Issue

FAS9500/AFF A900 node panics due to an uncorrectable machine check error:

BMC log：
PANIC:Uncorrectable Machine Check Error at CPU10. ICL_UBOX Error:STATUS<0xba00000000000e0b>(VALID,UC,EN,MISCV,PCC,CESI(0),CERR_CNT(0),OTHER_INFO(0),MSCOD(0),MCACOD(0xe0b))MISC<0x0000000049100000>(BUS_LOG(0x49),DEVICE_LOG(0x2),FUNCTION_LOG(0),SEGMENT_LOG(0))IIOMachine Check from device(s):RPT(73,2,0):
MicrochipPCI-E Switch on Controller, Br[4000](75,0,0): Link down. .  in process idle: cpu10 on release 9.11.1P4(C) on Mon Nov 20 13:54:15 JST 2023

Device 76/0/0 (SLOT-4) missing
System is resetting to enable power removal from missingdevice.

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