Instead of "b X::a", do the following: 

 % perl -d test.pl
# ...
206:                    $global_phase++;
  DB<1> l X::a
Switching to file 'test.pl'.
5:      sub a : ATTR(SCALAR) {
6:          print "a\n";
7:      }
  DB<2> b 6
  DB<3> c
X::a(attribBreak.pl:6):     print "a\n";
  DB<3>

[download]

- tye        

In reply to Re: bug in the debugger? breakpoints in subroutines ignored if attributes present (work-around) by tye
in thread bug in the debugger? breakpoints in subroutines ignored if attributes present by wu-lee

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