You could try it with a kernel built with options MP_LOCKDEBUG and see if it 
gives any clues.

On 20 March 2015 07:41:25 GMT+00:00, Dongsheng Song <dongsheng.s...@gmail.com> 
wrote:
>Hi ports,
>
>I download OpenJDK 8u40 b25 source from:
>
>https://jdk8.java.net/java-se-8-ri/
>https://www.java.net/download/openjdk/jdk8u40/ri/openjdk-8u40-src-b25-10_feb_2015.zip
>
>Then building it with jdk-1.7.0.71v0:
>
>http://ftp.openbsd.org/pub/OpenBSD/snapshots/packages/amd64/jdk-1.7.0.71v0.tgz
>
>During the building, OpenBSD system frozen without any exception
>messages,
>I must do power off and power on manually.
>
>I'm running OpenBSD current:
>OpenBSD 5.7-current (GENERIC.MP) #895: Wed Mar 18 18:55:03 MDT 2015
>
>Which download and install from
>http://ftp.openbsd.org/pub/OpenBSD/snapshots/amd64/install57.iso
>
>Regards,
>Cauchy

-- 
Sent from a phone, please excuse the formatting.

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