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Subject: dtrace pid provider on entry == segfault process
From: Adrian Chadd <adrian@freebsd.org>
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Hi!

Heres a fun one on stable/10:


This one works:

[root@darkwatch] /data/blockd# cat test.d
pid$target:libc*:memcpy:return
{
@[execname, ustack()] = count();
}


END

{

trunc(@, 3);

}

This one however doesn't!

[root@darkwatch] /data/blockd# cat test2.d
pid$target:libc*:memcpy:entry
{
 [execname] = quantize(arg2);
}