On Tue, 11 Aug 2026 19:03:17 GMT, Shiv Shah <[email protected]> wrote:
>> The test fails intermittently with OutOfMemoryError under -Xcheck:jni >> -XX:+UseZGC (the original report also had -XX:+ZGenerational, which is gone >> since JEP 490). Reproduced at about 2%: 6 of 300 runs on four hosts, all >> with the original signature. >> >> GC logs from the failing runs show the 512m heap reaching 100% with ZGC in >> back-to-back allocation-stall collections that reclaim almost nothing, >> ending in the OOME while Allocator.helper grows its list. The sampling >> agent holds jweaks on the sampled objects, which keeps the transient garbage >> alive until a major collection runs. The test's actual live set is only >> about 20MB. >> >> Fix: bump the test heap from 512m to 1g. >> >> Testing: 500 default-config runs at 1g all pass. The failing configuration >> at 1g (501 runs) had 2 OOME failures, about 0.4% vs 2% at 512m. >> >> >> >> --------- >> - [x] I confirm that I make this contribution in accordance with the >> [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). > > Shiv Shah has updated the pull request incrementally with one additional > commit since the last revision: > > enable gc logging in the test Looks good. ------------- Marked as reviewed by sspitsyn (Reviewer). PR Review: https://git.openjdk.org/jdk/pull/32229#pullrequestreview-5025479197
