RFR: 8324174: assert(m->is_entered(current)) failed: invariant [v2]

[Vladimir Kozlov]

On Tue, 30 Jan 2024 18:09:27 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> When we fail re-allocate scalarized object during deoptimization we unlock all monitors in affected frames and throw OOM exception [JDK-6898462](https://bugs.openjdk.org/browse/JDK-6898462).
>> The unlocking was done in incorrect order starting from outermost monitor which cause this assert when we unlock following nested monitor (the same object) - it sees that it was already unlocked.
>> 
>> The fix is to start unlocking from most nested/inner monitor.
>> I also noticed that we have incorrect order of frames for re-locking during deoptimization. We should start from outermost frame. Inside frame re-locking order is correct - from outermost monitor.
>> 
>> Added regression test with deep nested locks.
>> Ran tier1-5, Xcomp, stress testing.
>
> Vladimir Kozlov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix spacing

Second round of testing without modifying the test (no default flags run) passed.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/17600#issuecomment-1919808196