RFR: 8376287: Crashes when using -XX:ObjArrayMarkingStride=0 [v2]

[Thomas Schatzl]

On Thu, 29 Jan 2026 09:59:00 GMT, Guanqiang Han <ghan at openjdk.org> wrote:

>> Please review this change, it addresses a trivial issue. Thanks!
>> 
>> **Description:**
>> 
>> This is a trivial issue caused by the invalid value of -XX:ObjArrayMarkingStride=0, which results in a division by zero in the PartialArrayTaskStepper::start() method.
>> https://github.com/openjdk/jdk/blob/2529e2fe8dfe9685033bb0ae558266b8bc3cf95c/src/hotspot/share/gc/shared/partialArrayTaskStepper.inline.hpp#L39-L40
>> 
>> **Fix:**
>> 
>> Restrict the ObjArrayMarkingStride to positive values.
>> 
>> **Test:**
>> 
>> GHA
>
> Guanqiang Han has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove unused assert

See the other note about maximum value.

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Changes requested by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29479#pullrequestreview-3722254497