Backporting an AsyncGetCallTrace patch to OpenJDK6

[Hiroshi Yamauchi]

Hi,

I backported the change

  http://hg.openjdk.java.net/jdk7/jdk7/hotspot/rev/93b6525e3b82

into OpenJDK6 b11 (the patch attached) to avoid JVM crashes in the
AsyncGetCallTrace(). The change appears to have been first introduced
in OpenJDK7 b27 (Hotspot v13-b01).

It'd be great if this patch can be reviewed and applied to future OpenJDK6
builds.

I understand that this may be a 'scary' patch considering the stable
nature of OpenJDK6. I'd appreciate it if the Hotspot folks can review and
comment on this patch.

Thanks,
Hiroshi
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