RFR: 8077279: assert(ic->is_clean()) failed: IC should be clean

[Rickard Bäckman]

Looks good.

On 06/12, Stefan Johansson wrote:
> Hi,
> 
> Please review this change to fix:
> https://bugs.openjdk.java.net/browse/JDK-8077279
> 
> Webrev:
> http://cr.openjdk.java.net/~sjohanss/8077279/hotspot.00/
> 
> Summary:
> While doing some extra G1 testing a couple of issues were found.
> I've been able to reproduce this specific assert but I suspect that
> both JDK-8077282 and JDK-8077283 are related as well.
> 
> The root cause of the problem is a patch that was made a few months
> back that made it possible to have nmethods allocated in a code heap
> that differs from the compile level of the given nmethod, see [1].
> In the NMethodIterator used by G1 class unloading it is assumed that
> the nmethods have the same compile level as the code heap the are
> allocated in, which now is wrong. This can, under certain
> circumstances, lead to not all nmethods being cleaned correctly and
> then hit this assertion.
> 
> Testing:
> * Built and tested in JPRT
> * RBT run with using these testlists:
> jdk/test/:jdk,hotspot/test/:hotspot_all,vm.mlvm.testlist.
> 
> Thanks,
> Stefan
> 
> [1] https://bugs.openjdk.java.net/browse/JDK-8072774
/R
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