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Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8352744	24.0.2	Dmitry Chuyko	P4	Resolved	Fixed	b01
JDK-8351934	21-pool	Dmitry Chuyko	P4	New	Unresolved
JDK-8351935	17-pool	Dmitry Chuyko	P4	New	Unresolved
JDK-8351936	11-pool	Dmitry Chuyko	P4	New	Unresolved

When a decrement of TC subfield of ctl (Number of total workers [minus target parallelism in older versions], 16 bit at shift 32) is masked with UMASK (upper bits) mask, it may lead to corruption of RC subfield (Number of total workers [minus target parallelism], 16 bit at shift 48).

Current mainline code is like

https://github.com/openjdk/jdk/blob/e43960a0170bf29b28ff4733e1c8c927947fb0bb/src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java#L2080

The FJP can stop executing tasks. E.g. JDK-8330017

backported by

JDK-8352744 Inaccurate masking of TC subfield decrement in ForkJoinPool

JDK-8351934 Inaccurate masking of TC subfield decrement in ForkJoinPool

JDK-8351935 Inaccurate masking of TC subfield decrement in ForkJoinPool

JDK-8351936 Inaccurate masking of TC subfield decrement in ForkJoinPool

caused by

JDK-8134852 Integrate fork/join with API enhancements

relates to

JDK-8330017 ForkJoinPool stops executing tasks due to ctl field Release Count (RC) overflow

links to

Commit(master) openjdk/jdk24u/48f11a44

Commit(master) openjdk/jdk/fed34e46

Review(master) openjdk/jdk11u-dev/3012

Review(master) openjdk/jdk17u-dev/3354

Review(master) openjdk/jdk21u-dev/1485

Review(master) openjdk/jdk24u/148

Review(master) openjdk/jdk/24034

(1 relates to, 7 links to)