crash(8v)																 crash(8v)

Name
       crash - what happens when the system crashes

Description
       This section explains what happens when the system crashes and shows how to analyze crash dumps.

       When the system crashes voluntarily it prints a message on the console in the form:

	      panic: explanation

       The  system takes a dump on a mass storage peripheral device or the network, and then invokes an automatic reboot procedure as described in
       Unless there is some unexpected inconsistency in the state of the file systems due to hardware or software failure, the system then resumes
       multi-user operations.  If auto-reboot is disabled, the system halts at this point.

       The system has a large number of internal consistency checks; if one of these fails, it prints a short message indicating which one failed.

       The  most  common cause of system failures is hardware failure.	In all cases there is the possibility that hardware or software error pro-
       duced the message in some unexpected way.  These messages are the ones you are likely to encounter:

       IO err in push
       hard IO err in swap
	    The system encountered an error when trying to write to the paging device or an error in reading  critical	information  from  a  disk
	    drive.  Fix your disk if it is broken or unreliable.

       timeout table overflow
	    Due to the current data structure, running out of entries causes a crash.  If this happens, make the timeout table bigger.

       Exception Condition
	    An unexpected system error has occurred.  The exception types are as follows:

	    ---------------------------------------------------------------
	    Mnemonic   Description
	    ---------------------------------------------------------------
	    INT        External interrupt
	    MOD        TLB modification exception
	    TLBL       TLB miss exception (load or instruction fetch)
	    TLBS       TLB miss exception (store)
	    AdEL       Address error exception (load or instruction fetch)
	    AdES       Address error exception (store)
	    IBE        Bus error exception (for an instruction fetch)
	    DBE        Bus error exception (for a data load or store)
	    Sys        Sys call exception
	    Bp	       Breakpoint exception
	    CpU        Coprocessor unusable exception
	    Ovf        Arithmetic overflow exception
	    ---------------------------------------------------------------

       KSP not valid
	      This indicates either a problem in the system or failing hardware.

       init died
	      The  system initialization process has exited.  The only solution is the automatic reboot procedure described in Until this is done,
	      new users cannot log in.

       When the system crashes, it attempts to write an image of memory into the back end of the primary swap area.  After the system is rebooted,
       the  program  runs  and	preserves  a  copy  of	this core image and the current system in a specified directory for later access.  See for
       details.

       To analyze a dump, you should begin by running with the flag on the core dump.

See Also
       dbx(1), reboot(8), savecore(8)

								       RISC								 crash(8v)