JShell uses 100% of one core all the time (JDK 15 Build 27)

[Robert Field]

Thanks for the report.

What, if anything, is the Java stack for this thread (jps)?

-Robert


On 2020-06-15 14:41, Aaron Scott-Boddendijk wrote:
>   System:
> * Windows 10
> * Powershell
>
> When I start JShell, without executing anything, a CPU core is always at
> 100% (a single thread though I haven't identified what it's doing).
>
> The thread stack is as follows (with only the last two items sometimes
> change - but I don't know the internals of the JVM to know if this useful
> or significant):
>
> ntoskrnl.exe!KeSynchronizeExecution+0x5b46
> ntoskrnl.exe!KeWaitForSingleObject+0x1c2d
> ntoskrnl.exe!KeWaitForSingleObject+0xab4
> ntoskrnl.exe!KeWaitForSingleObject+0x255
> ntoskrnl.exe!RtlClearBitsEx+0x15a7
> ntoskrnl.exe!KeWaitForSingleObject+0x3828
> ntoskrnl.exe!KeSynchronizeExecution+0x3120
> jvm.dll!c2v_notifyCompilerInliningEvent+0x201797
>
> The JDK 14 version of JShell does not have this issue but several of the
> recent JDK 15 builds have done this.
>
> --
> Aaron Scott-Boddendijk