"Fixed" with cherry-pick of the 7a72f7a140bfd3a5dae73088947010bfdbcf6a40 and its predecessor 7103f60de8bed21a0ad5d15d2ad5b7a333dda201. Of course this is not a real fix as the only race precondition is shifted/disappeared by a clear assumption. Though there are not too many hotplug users around, I hope this information would be useful for those who would experience the same in a next year or so, until 3.18+ will be stable enough for hypervisor kernel role. Any suggestions on a further debug/race re-exposition are of course very welcomed. CCing kvm@ as it looks as a hypervisor subsystem issue then. The entire discussion can be found at https://lists.gnu.org/archive/html/qemu-devel/2015-06/msg03117.html . -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html