Fwd: RFR: 8181085: Race condition in method resolution may produce spurious NullPointerException

[Andrew Haley]

On 26/05/17 09:29, Andrew Dinn wrote:
> On 26/05/17 02:04, David Holmes wrote:
>> On 26/05/2017 4:55 AM, Martin Buchholz wrote:
>>> [+jdk8u-dev]
>>>
>>> We've been hunting the elusive spurious NPEs as well; the following seems
>>> to be working for us (but we don't have any small repro recipe);
>>> something
>>> like this should be put into jdk8:
>>
>> In other words you want a backport of:  8061964: Insufficient compiler
>> barriers for GCC in OrderAccess functions …
>>
>> https://bugs.openjdk.java.net/browse/JDK-8061964
> 
> Well, yes, that sounds like the 'correct' solution but ...
> 
>> IIRC what stopped this from being an 'automatic' backport candidate was
>> the potential problem of older gcc's needing to be validated.
> 
> If the 'correct' fix fails because of legacy compilers

It won't.  All of the Linux kernel and all of glibc requires this mechanism
to work, and it has always worked.

Andrew.