sending a followup twice with different users let the reactor 
overreact (loop until no maximum recursion).

i know where to 
turn this off
nosyreactor.py move 2nd change=1 down:
line: 82
  
if db.user.get(authid, 'username') == 'anonymous': continue
  
change = 1 # MOVE FROM
  # append the author only after issue 
creation
  if oldvalues is None:
    nosy.append(authid)
    change = 
1 # TO HERE

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the test contains (silly me no readme)
output: fw2_2.output-
extpatched,fw2_6.output-extpatched 
and fw2_2.output-
classicpatched,fw2_6.output-classicpatched.

extpatched means 
extended/nosyreactor patched and classic patched the 
classic/nosyreactor.
it seams extended/nosy is never loaded.

and 
the changed files.
I DONOT KNOW if the nosyreactor patch does not break 
other things.

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user_id=6405

fixed, thanks for chasing it up!