Conference proxy::laser

1259.0. "Console Error Message When Examining VMEM" by CSC32::STRING () Mon Apr 21 1997 17:26

    Hello,
    	   I am working with a customer who is following the procedure to
    force a crash on a VAX 7840 who is getting an error when trying to
    examine the virtual memory address of the ISP. She does the >>> EXAMINE
    ISP command and gets IPR: 00000004 (ISP) 7FFE7730 returned from the
    console. She then does a EXAMINE -N 2 -L -S 4  vmem:7FFE7730 and gets
    the following message: "Length violation found while converting virtual
    address 7FFE7730. Error in read of 4 bytes at location 7FFE7730 from
    vmem." The customer got this procedure from a DSNlink article on how to
    force a crash on the VAX 7000, so apparently this should work. She sent
    me this information via fax and prior to performing these commands I
    see a "set compat_mode v55" followed by a "D PSL 041F0000", a "D PC
    FFFFFFFF" and then a "SYSTEM SHUTDOWN COMPLETE- use console to hale
    system". Could the problem be that VMS is shutdown already or something
    with the V55 compatibility? Any suggestions would be appreciated. Thank
    You for your time. 
    
    			Andy String  

    All I can say here is that the basic process is right.  I tried the
    steps indicated in .0 and all seems to be right.  I can examine the
    isp and then the VMEM indicated.  I even crashed the system by the
    deposit of ffffffff in the pc.  That ISP address looks a little
    suspicious.  The ISP should start with 8xxxxxxx. ??
    
    While running VMS the ^p is issued, the user should be able to exam 
    the ISP and its subsequent contents of that address using the command
    string in the base note.  If a FFFFFFFF is deposited in the PC at this
    point and a continue is issued the CPU should crash.  Does for me.
    
    Regards,
    Jim Sadin
    AVSRSE console engineering

    Jim,
    	  Thank You for your effort. This makes me believe that the problem
    was that the customer shut down VMS first, invalidating the ISP. I have
    advised her to try this procedure with VMS up and let me know the
    results. Thanks again for your assistance.
    
    			Andy String