Comment 31 for bug 1318531

The bisection shows that the issue has been fixed between 3.14.3-utopic and 3.15-rc1-trusty.
I'll go on with the guide bisecting the error in the torvald repository using the ubuntu configuration as in this guide:

https://wiki.ubuntu.com/KernelTeam/GitKernelBuild#Using_Ubuntu_Kernel_Configuration

Let me know if I should use vanilla instead.