A DESCRIPTION OF THE PROBLEM :
sun.nio.ch..KQueue.java is using the following constant definitions:

 static final int EVFILT_READ = -1;
static final int EVFILT_WRITE = -2;

However on NetBSD values are defined different with sys/event.h:
(since 7.0 upto current 8.0)

#define EVFILT_READ 0U
#define EVFILT_WRITE 1U

It likely is advisable to initialize the constants from native code in a similar way as it is done with the offset values in the same class.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Just use NIO based accept on such platform.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
accpat will work correctly
ACTUAL -
accept strangly fails as
underlying kquee will fail with EINVAL

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e.g. use karaf on NetBSD
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CUSTOMER SUBMITTED WORKAROUND :
Do not use openjdk on NetBSD platform

FREQUENCY : always