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# Existing
We have debugging infrastructure. For example:
* [[GDB]]
* [[GNU Mach debugging|microkernel/mach/gnumach/debugging]]
* [[GNU Hurd debugging|hurd/debugging]], including
[[hurd/debugging/rpctrace]], and more.
# To Do
* [[glibc]]'s sotruss
* [[ltrace]]
* [[latrace]]
* [[profiling]]
* *Checkpoint/restart allows the state of a set of processes to be saved to
persistent storage, then restarted at some future time* -- quoting from
Jonathan Corbet's [2010 Linux Kernel Summit
report](http://lwn.net/Articles/412749/).
This is surely a very useful facility to have for reproducing failures, for
example. But on the other hand it's questionable how it can help with
debugging failures in [[GNU Hurd server|hurd/translator]]s' interactions,
as their state is typically spread between several processes.
Continues: <http://lwn.net/Articles/414264/>, which introduces
<http://dmtcp.sourceforge.net/>.
* [[crash_server}}, [[GDB_gcore]],
<http://code.google.com/p/google-coredumper/>
* [[community/gsoc/project_ideas/libdiskfs_locking]]
* <http://lwn.net/Articles/415728/>, or <http://lwn.net/Articles/415471/> --
just two examples; there's a lot of such stuff for Linux.
* [[debugging_gnumach_startup_QEMU_GDB]]
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