[Bug 239894] security.bsd.stack_guard_page default causes Java to crash

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239894

--- Comment #4 from Kurt Miller <kurt at intricatesoftware.com> ---
Yes, that's the root of the problem. The JVM needs to be able to
deterministically manage its own guard pages independently from both the kernel
placed ones and the pthread placed ones. Where 'manage' means change the
protection of the pages to PROT_NONE and back to PROT_READ|PROT_WRITE.

I think if the issues mentioned in comment #1 that kernel placed guard pages
cause pthreads are corrected, it is very likely the JVM will be able to use the
same method as libthr to place its guard pages (currently with mprotect(2)).

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