Comment 4 for bug 1386257

@debfx this is precisely why intel microcode package should be consistently installed and this is done in response to the TSX problem described before. microcode update is the last resort that vendor has to correct firmware bugs in the field. microcode update removed TSX instruction because the implementation turned out to have issues. But that was not sufficient alone, due to incorrect detection in the user-space code and the fact that microcode is not updated on most client systems. This one of the corrective actions going forward to mitigate / contain similar type of problem in the future.