Integrated: 8360288: Shenandoah crash at size_given_klass in op_degenerated

[William Kemper]

On Thu, 10 Jul 2025 22:20:00 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Both degenerated and full GCs unload classes before reclaiming unmarked humongous objects. This may result in a null klass pointer dereference when reclaiming unmarked humongous objects. Prior to this change, the number of regions occupied by a humongous object was computed from the size of the object. To avoid using `oop::size` after class unloading on an unmarked object, Shenandoah now trashes the humongous start region followed by subsequent continuation regions.

This pull request has now been integrated.

Changeset: 3b44d7bf
Author:    William Kemper <wkemper at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/3b44d7bfa4d78e3ec715fce1863e052852f33180
Stats:     20 lines in 2 files changed: 3 ins; 7 del; 10 mod

8360288: Shenandoah crash at size_given_klass in op_degenerated

Reviewed-by: shade

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PR: https://git.openjdk.org/jdk/pull/26256