In the validate report, no more critical issue is found except the hardware errors on 05/11/2016.
And I did search these error message from HP website, and issues below is quite similar with ours.
http://community.hpe.com/t5/ProLiant-Servers-ML-DL-SL/DL380p-Gen8-with-uncorrectabl-PCI-express-error/td-p/5995669
http://community.hpe.com/t5/ProLiant-Servers-ML-DL-SL/Proliant-DL380-G7-Fatal-PCI-Express-Device-Error-PCI-B00-D00-F00/td-p/5313433
As you can see in this 2 article chains, HP doesn’t have a quite certain way to identify and solve this error.
After the issue happened, we have hard reboot the server, if the issue was not happened after that (as no new hardware error logged in hplog), I think this problem happened due power outage.
ADDITIONAL INFORMATION:
This appears to be an HP iLo Issue. Another solution is to upgrade the HP/ProLiant DL360p Gen8 Firmware to latest version.
PSN027020u Name of problem PSN027020u HP DL360P G8 Firmware Update
https://downloads.avaya.com/css/P8/documents/101010876
From validateSP:
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Is BIOS firmware latest? Current: 20130301 Latest: 20140802 [ WARNING ]
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additional external information about this issue with iLo
http://www.linuxquestions.org/questions/linux-general-1/bl460c-g8-host-unexpectedly-reset-4175506736/ ]
Make sure you download the Firmware update from Avaya Support page.