Number: 1001

Date:  7-May-84  9':19':41

Submitter: Sannella.PA


Subject: Inside Tedit': "compiler/microcode error': unknown UFN."

Assigned To: 


Status: Incomplete


Problem Type: Bug

Impact: Moderate

Difficulty: Hard

Frequency: Once

Priority: Unlikely

System: Language Support

Subsystem: Microcode

Machine: 1100


Lisp Version: 2-May-84 00':11':18

Source Files: 

Microcode Version: 

Memory Size: 

File Server: 

Server Software Version: 

Disposition: [this kind of stuff just cruds up the AR system with non-reproducable results. I''m marking it Incomplete to get it out of the Open-ARs list.]'
["Masinter" " 5-Sep-84 17':31':50" Attn': Status':(Open->Incomplete) Disposition':]

Description: '
Date':  4 May 84 16':46 PDT'
Subject': Lisp': compiler/microcode error'
Lisp System Date':  2-May-84 00':11':18'
Machine': Dolphin (Duchamp)'
Microcode version': 24,1'
Memory size': 10000'
Frequency': Once'
Impact': Serious'
Susi asked me to take a look at her machine, which had dropped into Raid.  Raid said "compiler/microcode error': unknown UFN."  The stack looked like this': (forgive my punctuation/spelling)'
The sysout was that of 2-May-84 00':11':18; Susi was browsing mail when it happened.  I eventually ↑N-ed back into Lisp and looked at the code of \SYSBUFP, which looked ok to my untrained eye.  Everything ran fine after that, and Susi was able to continue browsing.'
Blame it on cosmic rays.'
Date': 10 May 84 11':02 PDT'
On the evidence presented in the report, I have reclassified this from Tedit to Dolphin microcode, priority unlikely.  I.e., it looks like either the microcode took a wild leap in \SYSBUFP (not likely), it returned to the wrong place from a function call (also unlikely), or there is a bug in the stack code (Lisp or microcode), and the \SYSBUFP frame had just undergone a stack overflow or hard return (conceivable).'
Without a much more detailed examination of the stack, there isn''t enough to go on.  The one piece of evidence that I would have loved to have seen in the report was the pc of \SYSBUFP.'


Test Case: 

Edit-By: Masinter

Edit-Date:  5-Sep-84 17':31':51