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0e1f616
(Get the code!)
One way to debug RT Ubuntu kernels is to start with the stable kernel and apply the RT patches (e.g. a non-Ubuntu kernel) and build with the ubuntu config. Then see if the bug occurs. If it does not, then it must be some addition extra in the Ubuntu kernel that is causing the issue (e.g. Apparmor, etc).
In the past when working on the Ubuntu RT kernels I found that the stable kernel + RT patches work well and only when the Ubuntu config and/or ubuntu extras are added we get RT kernel issues.