[Info-vax] DCL crashing bug update

[Volker Halle]

Simon,

I can easily reproduce the process crash on OpenVMS Alpha V8.2 running on a CHARON-AXP A1000 emulated Alpha.

The failing instruction is inside DCL:

SDA> exa/ins 7AF98598
DCL+8A598:      LDQ_U           R21,(R9)

with R9 pointing to an invalid address

  Improperly handled condition, bad stack or no handler specified.
    Signal arguments:   Number = 0000000000000005
                        Name   = 000000000000000C   <<< Access violation
                                 0000000000000000
                                 000000007FFC9C78   <<< invalid address
                                 000000007AF98598   <<< failing PC
                                 0000000000000012

    Register dump:
    R0  = 000000007FF9CC20  R1  = 000000007AF0E1E0  R2  = 000000000000000A
    R3  = 000000007FF9CC20  R4  = 000000007AF0E320  R5  = 0000203320205324
    R6  = 0000000000000001  R7  = 000000007FF9CD3C  R8  = 000000007FFA4F28
    R9  = 000000007FFC9C79<<< R10 = 000000007FFA4F28  R11 = 000000007FFCDBE8
    R12 = 000000007FFCDA68  R13 = FFFFFFFFFB03C08C  R14 = 00000000000000FB
    R15 = 000000000000002F  R16 = 000000007FFCED8A  R17 = 00000000000011A2
    R18 = 000000007FFC8C57  R19 = 0000000000000001  R20 = 000000007FFCED88
    R21 = 000000007FFC8C59  R22 = 000000007FFCED88  R23 = 000000007FF9FEA4
    R24 = 000000000000612F  R25 = 0000003400000000  R26 = 000000007AF98820
    R27 = 000000007AF0E1E0  R28 = 000000007AF989AC  R29 = 000000007FF9CBF0
    SP  = 000000007FF9CBF0  PC  = 000000007AF98598  PS  = 3000000000000012


The MACHINECHK Crash you've seen is most likely NOT related to this Problem.
A MACHINECHK Crash is typically a 'hardware' Problem. In this case (running on the FreeAXP Emulator), it's most likely an Emulator Software Problem.

Did you get a crashdump written ? Did you extract the errlog Information from the Crash (using SDA> CLUE ERRLOG) and analyze CLUE$ERRLOG.SYS with DECevent ? This would tell you more about the underlying reason for the MACHINECHK.

Volker.