Number: 2211

Date: 20-Sep-84 14':44':44

Submitter: Dering.pasa

Source: (Schoen - SDR)Schoen@sumex-aim, Dering.pasa

Subject: DTiger dies in Teleraid after page fault puts machine in RAID

Assigned To: 

Attn: vanmelle

Status: Open


Problem Type: Bug

Impact: Moderate

Difficulty: Impossible


Priority: Hopefully

System: Language Support

Subsystem: Bootstrapping and Teleraid

Machine: 1108


Lisp Version: 21-Jun-84 10':50':28

Source Files: 

Microcode Version: 5124

Memory Size: 7168

File Server: 

Server Software Version: 

Disposition: '
["Sannella.PA" "21-Sep-84 15':44':13" Subject': Attn': Status':(New->Open)]'
Bill, I believe this one is "Impossible" because once you have a bad spot on the disk, Teleraid still will want to read it. Opinion?'
["masinter" "24-Sep-84 18':04':26" Source': Attn': Difficulty':(->Impossible) Disposition':]

Description: Eric Schoen has reported what appears to be a problem in TeleRaid on the DTiger.  Occasionally the machine falls into RAID when fetching apage from disk to satisfy a page fault.  He puts the machine in TeleRaid, and the backtrace indicates the call to raid happens inside \DL.XFERDISK.  He assumes that he has hit a "bad spot" or the disk controller has misbehaved. After 6 or 7 stack frames are displayed by the machine running the TeleRaid user, the sick DTiger''s cursor inverts, and the DTiger goes silent over the TeleRaid connection, and the TeleRaid user soon breaks  (Remote system not responding).  At the point, no combination of ↑D or STOP gets the sick DTiger out of Raid/TeleRaid.'


Test Case: 

Edit-By: masinter

Edit-Date: 24-Sep-84 18':04':26