DTrace script asserts and kills the other process

[Yuri]

I am trying to run this dtrace script:

#!/usr/sbin/dtrace -s
pid123:libc::entry
{
self->timestmp[probefunc] = timestmp;
}
pid123:libc::return
/self->timestmp[probefunc] != 0/
{
@function_duration[probefunc] = sum(timestmp - self->timestmp[probefunc]);
timestmp[probefunc] = 0;
}

which I got from here:  
http://www.princeton.edu/~unix/Solaris/troubleshoot/dtrace.html
replacing 123 with the pid of some running process.

Result: dtrace utility asserts:
Assertion failed: (dpr != NULL), file  
/usr/src/cddl/lib/libdtrace/../../../cddl/contrib/opensolaris/lib/libdtrace/common/dt_proc.c, line  
751.
Abort trap: 6

Also the target process is killed too:
Killed: 9

8.2-STABLE amd64

Yuri