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open issues
- binutils-gdb
 - boehm gc
 - crash server
 - Debugging GNU Mach's startup in QEMU with GDB
 - ext2fs deadlock
 - gdb-heap
 - GDB: attach
 - GDB: catch syscall
 - GDB: gcore
 - GDB's non-stop mode
 - gdb noninvasive mode new threads
 - GDB: pending_execs
 - gdb signal handler
 - GDB: bt on the signal thread
 - GDB: thread ids
 - mach-defpager debugging
 - thread numbering of ps and gdb
 - whole system debugging