ADDITIONAL SYSTEM INFORMATION :
Debian 9 (Devuan 2.1)

A DESCRIPTION OF THE PROBLEM :
Since I switched to OpenJDK 1.8 (linux debian 9, openjdk version "1.8.0_242"), I encountered a lot of issue with filesystem usage.

The CPU has really high usage peaks, over 150%, by only browsing files in applications like netbeans (8 to 11) and every other java apps that reads directories contents, resulting in a system slowdown after a bit.

The problem seems to be not present in the Oracle JRE 1.8 bundled with old netbeans 8.2 (java version "1.8.0_101").
The older OpenJDK provided by debian 8, was working well.

REGRESSION : Last worked in version 8

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Open a java based application and accessing the filesystem, results in very high cpu load peaks pretty soon.
Some apps that read files (txt or images) from the filesystem, resulting in a crash.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expect a lower cpu usage, normally, the cpu load is about 10%
ACTUAL -
Cpu usage over 150%

CUSTOMER SUBMITTED WORKAROUND :
Revert to an earlier version of JDK

FREQUENCY : always