Backporting an AsyncGetCallTrace patch to OpenJDK6

[Joe Darcy]

Daniel D. Daugherty wrote:
> Can someone remind me which HSX version OpenJDK6-B11 is based on?

Currently in OpenJDK 6 we are on HS10, but we plan to upgrade to HS11 in 
the near future.

-Joe

>
> Compiler team, Steve G. had talked about back porting this fix
> to earlier HSX releases (prior to HSX-13), but I don't believe
> that he got to that task or handed off to anyone else on the
> Compiler team prior to the unfortunate event at the end of June.
>
> I reviewed Steve's original changes from an AsyncGetCallTrace()
> point-of-view and I can review these change from the same POV,
> but one or more folks on the compiler team is going to have to
> look at these changes from the Compiler team POV...
>
> Dan
>
>
>
> Hiroshi Yamauchi wrote:
>> 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
>>