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 # Open Issues
 
 [[!inline pages=tag/open_issue_gdb raw=yes feeds=no]]
+
+  * *[Implementing a Mach Debugger for Multithreaded
+    Applications](http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.38.5670)*,
+    Deborah Caswell and David Black, 1990.  This talks about GDB.