There is a FOSS Factory bounty (p265) on some GNU Mach tasks.
- community
 - faq
 - hurd
 - Linux Trace Toolkit Next Generation (LTTng)
 - microkernel
 - 
open issues
- 64-bit port
 - address space memory mapping entries
 - automatically checking port deallocation
 - BPF
 - dde
 - Debugging GNU Mach's startup in QEMU with GDB
 - default pager
 - device drivers and io systems
 - ext2fs page cache swapping leak
 - gnumach PCI access
 - gnumach console timestamp
 - gnumach constants
 - gnumach general protection trap gdb vm read
 - gnumach integer overflow
 - gnumach kernel threads
 - gnumach memory management
 - gnumach memory management 2
 - gnumach memory management physical memory
 - gnumach page cache policy
 - gnumach panic thread dispatch
 - gnumach rpc timeouts
 - gnumach tick
 - gnumach tlb flushing
 - gnumach vm map entry forward merging
 - gnumach vm map red-black trees
 - gnumach vm object resident page count
 - librpci
 - Linux: vmsig
 - low memory
 - mach-defpager swap
 - mach-defpager vs defpager
 - mach migrating threads
 - Mach on Top of POSIX
 - mach shadow objects
 - mach tasks memory usage
 - mach vm pageout
 - managed runtime initiative
 - memory object model vs block-level cache
 - metadata caching
 - mmap crash etc
 - a nanosecond-precision clock
 - Open POSIX Test Suite
 - osf mach
 - page cache
 - placement of virtual memory regions
 - POSIX_FADV_VOLATILE
 - Problematic packages
 - resource management problems
 - rework gnumach ipc spaces
 - SMP
 - strict aliasing
 - system call mechanism
 - system crash nmap
 - system crash pflocal fifo
 - time
 - user-space device drivers
 - vdso
 - virtio
 - virtualbox
 - vm map kernel bug
 - whole system debugging
 - (ipc/mig) wrong reply message ID
 
 - SystemTap