Hi All,

I have been doing some application tracing on OS X using the pid provider to
trace function entry and returns.  I have noticed that some function have
entry probes, but no return probes.  In fact, there are not even any
instruction offset probes, only the entry probe. This is unbalancing the
indent flow graphs (-F).  Any idea why this is happening?

Example:

# dtrace -l -p 243 -n 'pid$target::memcpy:'
Password:
   ID   PROVIDER            MODULE                          FUNCTION NAME
57175     pid243 libSystem.B.dylib                            memcpy entry
225226     pid243              dyld                            memcpy entry
# 


# dtrace -l -p 1617 -n 'pid$target::RTSPSession_CheckState:'
   ID   PROVIDER            MODULE                          FUNCTION NAME
437436    pid1617 QuickTimeStreaming            RTSPSession_CheckState entry
# 


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