after upgrade from splunk-7.3.1 to splunk-8.1.1 service crash

[indeed_2000]

Hi

Upgrade from splunk-7.3.1 to splunk-8.1.1 have some issue:

1-when I going to "search page" at this url http://IP:9000/app/search/search

suddenly service stopped! I can't find any clue from logs. FYI when I going to other page service not fail and work correctly, but on search page stopped!

2-give this error (i try to change password as mention here but service still crash)

TailReader-0

• Root Cause(s):
  • The monitor input cannot produce data because splunkd's processing queues are full. This will be caused by inadequate indexing or forwarding rate, or a sudden burst of incoming data.
• Last 50 related messages:
  • 03-04-2021 21:23:44.451 +0330 WARN TailReader - Could not send data to output queue (parsingQueue), retrying...
  • 03-04-2021 21:23:38.011 +0330 INFO TailReader - State transitioning from 1 to 0 (initOrResume).
  • 03-04-2021 21:23:38.011 +0330 INFO TailReader - State transitioning from 1 to 0 (initOrResume).
  • 03-04-2021 21:23:38.007 +0330 INFO TailReader - batchreader0 waiting to be un-paused
  • 03-04-2021 21:23:38.007 +0330 INFO TailReader - Starting batchreader0 thread
  • 03-04-2021 21:23:38.007 +0330 INFO TailReader - Registering metrics callback for: batchreader0
  • 03-04-2021 21:23:38.005 +0330 INFO TailReader - tailreader0 waiting to be un-paused
  • 03-04-2021 21:23:38.005 +0330 INFO TailReader - Starting tailreader0 thread
  • 03-04-2021 21:23:38.004 +0330 INFO TailReader - Registering metrics callback for: tailreader0

Any idea?

Thanks,