RFR: 8357514: Disable AOT caching for runtime stubs

[Vladimir Kozlov]

On Thu, 22 May 2025 03:52:33 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> After [JDK-8354887](https://bugs.openjdk.org/browse/JDK-8354887) was integrated we hit strange failures which looks like memory stomps during our JCK testing of AOT new JEPs:
>> 
>> # Internal Error (/workspace/open/src/hotspot/share/opto/regmask.hpp:222), pid=4186624, tid=4186658
>> # assert(_RM_UP[i] == 0) failed: _hwm too low: 5 regs at: 4
>> 
>> or
>> 
>> # Internal Error (/workspace/open/src/hotspot/share/opto/type.cpp:996), pid=2832821, tid=2832868
>> # fatal error: meet not symmetric
>> 
>> or other strange issues during C2 compilation
>> 
>> After investigating (running tests in loop) I narrowed down the issue to AOT caching of C2 runtime stubs:
>> 
>> https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/output.cpp#L3491
>> 
>> After internal discussion we decided disable all runtime stubs caching.
>> There is no guarantee that we may not have issues with C1 stubs too.
>> 
>> I propose hard code AOTStubCaching flag to `false` value until the issue is solved.
>
> Marked as reviewed by iveresov (Reviewer).

Thank you, @veresov

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

PR Comment: https://git.openjdk.org/jdk/pull/25379#issuecomment-2899825901