JDK-8370887 DelayScheduler Bug Discussion

[Viktor Klang]

Hi Kent,

Thanks for reporting, it has previously been reported and is tracked 
here: https://bugs.openjdk.org/browse/JDK-8370887

On 2025-11-15 14:17, Kent Dong wrote:
> Hi guys,
>
> During our trial of Java 25, we found this bug JDK-8370887 
> <https://bugs.openjdk.org/browse/JDK-8370887> DelayScheduler.replace 
> <https://delayscheduler.replace/> method may break the 4-ary heap in 
> certain scenarios. Since NIO uses virtual threads for poller by 
> default in Linux, it may affect the timeout of IO operations. If it 
> can be fix, we would be more confident to use Java 25 and VT in our 
> production environment.
>
> After a full analysis, we found it is caused by a missing sift-up 
> branch in DelayScheduler.replace method, and it's not quite hard to 
> fix. And it stays silent in JBS for quite a while. Is there a 
> schedule/plan for it to be fixed or maybe we can contribute a fix to it?
>
> Thanks.
>
> Kent Dong
>
-- 
Cheers,
√


Viktor Klang
Software Architect, Java Platform Group
Oracle
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