[VW 7.7.1 64 bits] Memory access violations on Ubuntu Linux 11.10

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[VW 7.7.1 64 bits] Memory access violations on Ubuntu Linux 11.10

Paulo-27
Dear all,

after updating a running system to the version 11.10 of Ubuntu,
VisualWorks (64 bit) runs for a certain amount of time until it dies
after a memory access violation. Here are the last messages printed
by the "debug on"-virtual machine:

lost time signal in waitForIOWithTimeout, milliseconds 2
lost time signal in waitForIO, milliseconds 0
lost time signal in waitForIO, milliseconds 0
Assert fail @ 310 in tran/nmcompact.c   nMethodOK(curr)
Speicherzugriffsfehler

VisualWorks version:

dellani@KITT:~/$ visual -v
VisualWorks(R) 7.7.1 Jul  7 2010
Copyright (C) 1999-2009 Cincom Systems, Inc.
Release identification ...
        OE   version: 68 platform: 64 release: 68.15 flags: 0
        VI   version: 0 minor: 0 release: 0 variant: 0
        From version: 0 platform: 0 release: 0.1 flags: 0

and here are some details about the system itself:
dellani@KITT:~/$ uname -a
Linux KITT 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux

I tried the 32-bits virtual machine on the same system and it just runs fine!
Anyone experiencing these same problems?

Cheers, Paulo
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