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Analyzing TO/BTO/DTO and BERR/DBERR Solaris Crash Dumps (Doc ID 1003640.1)

Last updated on JANUARY 29, 2022

Applies to:

Solaris Operating System - Version 8 and later
All Platforms


When a system panics with a bad trap from an MMU miss, it is because the MMU does not have a translation entry for the virtual address(VA) used in the instruction to a physical(hardware) address(PA).
TO/BTO/DTO and BERR/DBERR panics are similar, in that they are caused by referencing an illegal address. In this case, however, the illegal address is the physical address(PA).

For practical purposes, a TO/BTO/DTO is caused by a PA that's valid for the system, but there is nothing at the address the PA is referencing, or the device at that address did not respond in time.

A BERR/DBERR, indicates that the PA being used is always illegal, or is reserved for the system.

Further details about TO/BTO/DTO/BERR/DBERR events, may be obtained from the specific processor reference manual.


TO = Timeout
BTO = Bus Timeout
DTO = Disrupting Timeout
BERR = Bus Error
DBERR = Disrupting Bus Error


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