maintainer-feedback requested: [Bug 211196] java/openjdk8: thread id missing from jstack output against core files

[bugzilla...@freebsd.org]

Ron Roskens <ronald....@gmail.com> has reassigned Bugzilla Automation
<bugz...@FreeBSD.org>'s request for maintainer-feedback to ja...@FreeBSD.org:
Bug 211196: java/openjdk8: thread id missing from jstack output against core
files
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211196



--- Description ---
Created attachment 172643
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=172643&action=edit
patch for hotspot/src/os/bsd/vm/os_bsd.cpp

When analyzing a JVM core dump, jstack is unable to display any stacktraces for
any threads because it cannot match any thread id's.

In the JVM on BSD, a thread is represented by two different thread id values,
however, only when defined(__APPLE__) does the second value, unique_thread_id,
get set. Its unique_thread_id that jstack uses to match thread ids in a core
dump.

I've been using the attached two local patches.

patch-rjr-os_bsd.cpp sets unique_thread_id to the same value as the thread_id.
patch-rjr-BsdThread.java adds the unique_thread_id to BsdThread.toString()
output.
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