Hi Greg, could you cherry-pick the commit 8fbcfeb8a9cc803464d6c166e7991913711c612c mac80211_hwsim: Replace bogus hrtimer clockid for 4.4.x stable? The current 4.4.x triggers BUG_ON() just by loading mac80211_hwsim module. See openSUSE bug#1047651 for details: https://bugzilla.opensuse.org/show_bug.cgi?id=1047651 The BUG_ON() itself comes from 4.4.21 stable updates, introduced by the commit 4fc2942b6e2d: hrtimer: Catch illegal clockids [ Upstream commit 9006a01829a50cfd6bbd4980910ed46e895e93d7 ] But in the upstream, this commit was reverted once by commit 82e88ff1ea94, then later on, revived (but with WARN() instead of BUG_ON()) by the commit 336a9cde10d6. So, we should also follow that on 4.4.x, too. I haven't followed the situation on other stable trees. Thomas or Marc should have a better grasp on them, so I leave to them :) thanks, Takashi