This is probably silly of me, but if you had an understanding of the mach subsystem this is pretty straightforward to understand, no comments necessary.
Instapanic on 10.10.2 (build 14C109, xnu-2782.10.72~2), without root.
See also (works on iOS and OS X (if you change the target in Xcode)): https://github.com/jdmoreira/KernelPanic-10LOC
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[ 10.0 ms ] story [ 44.5 ms ] threadpanic(cpu 6 caller 0xffffff80201b61ad): "NO ENTRY TO DELETE"@/SourceCache/xnu/xnu-2782.20.26/osfmk/vm/vm_map_store_rb.c:118
Update: here's the panic report:
https://gist.github.com/bd096ba0194df8a579d8
Update 2: here's where the panic occurred
vm_map_store_entry_unlink_rb
https://opensource.apple.com/source/xnu/xnu-2782.1.97/osfmk/...
Update 3: other panic reports http://pastebin.com/w3pTx3bh https://twitter.com/dcbz32/status/534452119819276288