RFR: 8297389: resexhausted003 fails with assert(!thread->owns_locks()) failed: must release all locks when leaving VM [v2]
Tobias Hartmann
thartmann at openjdk.org
Mon Nov 28 12:01:43 UTC 2022
> `Method::build_profiling_method_data` acquires the `MethodData_lock` when initializing `Method::_method_data` to prevent multiple allocations by different threads. The problem is that when metaspace allocation fails and `JvmtiExport::should_post_resource_exhausted()` is set, we assert during the `ThreadToNativeFromVM` transition in JVMTI code.
>
> Since concurrent initialization is a rare event, I suggest to get rid of the lock and perform the initialization with a `cmpxchg`, similar to how method counters are initialized:
> https://github.com/openjdk/jdk/blob/f4b5065c37e86f4b2ca26da6ce678febe4a52950/src/hotspot/share/oops/method.cpp#L644-L646
>
> Since [current code](https://github.com/openjdk/jdk/blob/f4b5065c37e86f4b2ca26da6ce678febe4a52950/src/hotspot/share/oops/method.inline.hpp#L41-L46) in `Method::set_method_data` uses a `Atomic::release_store`, I added a `OrderAccess::release()`.
>
> Thanks,
> Tobias
Tobias Hartmann has updated the pull request incrementally with one additional commit since the last revision:
Removed OrderAccess::release, added assert and adjusted ciReplay code
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/11316/files
- new: https://git.openjdk.org/jdk/pull/11316/files/8c234464..7e94c2b2
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=11316&range=01
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=11316&range=00-01
Stats: 18 lines in 3 files changed: 1 ins; 12 del; 5 mod
Patch: https://git.openjdk.org/jdk/pull/11316.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/11316/head:pull/11316
PR: https://git.openjdk.org/jdk/pull/11316
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