[Bug 268897] panic: [pmc,4811] Retrieving callchain for thread that doesn't want it

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268897

--- Comment #2 from John F. Carr <jfc@mit.edu> ---
I ran the same command again and the system crashed immediately.  The program
only runs for a second or a few seconds.  It did not crash when I did not use
pmcstat's "-U" option.

The program "run" starts 48 long-lived threads on this 24x2 system.  Most of
the threads are spending a lot of time in a loop trying to acquire a spinlock. 
This is the issue that drove me to try performance tools.

I will try to assemble a reproducing program within the attachment size limit.

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