On 17/02/17 09:28, Thomas Gleixner wrote: > On Fri, 17 Feb 2017, kernel test robot wrote: > >> Hi Marc, >> >> We find this oops in linux-4.4.y. The gcc-6 compiled mainline kernel is fine. The last bit is worrying, as mainline has the exact same bug. Has it been tested the same way? >> >> commit 4fc2942b6e2de2efc8a9d3784d4b0d3543149613 >> hrtimer: Catch illegal clockids > > And that commit is doing what the subject line says. Catch illegal usage. > >> [ 38.101342] Call Trace: >> [ 38.101342] Call Trace: >> [ 38.102045] [<ffffffff8109aee1>] tasklet_hrtimer_init+0x16/0x52 >> [ 38.102045] [<ffffffff8109aee1>] tasklet_hrtimer_init+0x16/0x52 >> [ 38.103698] [<ffffffff81c767c7>] mac80211_hwsim_new_radio+0x766/0x84d > > The real bug is in this code: > > drivers/net/wireless/mac80211_hwsim.c > > mac80211_hwsim_new_radio() > > tasklet_hrtimer_init(&data->beacon_timer, > mac80211_hwsim_beacon, > CLOCK_MONOTONIC_RAW, HRTIMER_MODE_ABS); > > CLOCK_MONOTONIC_RAW is not a supported clockid for hrtimers. Sigh. > > Fix below. > > Thanks, > > tglx > > 8<------------------ > > diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c > index 0cd95120bc78..da363ec91a1c 100644 > --- a/drivers/net/wireless/mac80211_hwsim.c > +++ b/drivers/net/wireless/mac80211_hwsim.c > @@ -2535,9 +2535,8 @@ static int mac80211_hwsim_new_radio(struct genl_info *info, > data->debugfs, > data, &hwsim_simulate_radar); > > - tasklet_hrtimer_init(&data->beacon_timer, > - mac80211_hwsim_beacon, > - CLOCK_MONOTONIC_RAW, HRTIMER_MODE_ABS); > + tasklet_hrtimer_init(&data->beacon_timer, mac80211_hwsim_beacon, > + CLOCK_MONOTONIC, HRTIMER_MODE_ABS); > > spin_lock_bh(&hwsim_radio_lock); > list_add_tail(&data->list, &hwsim_radios); > Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx> M. -- Jazz is not dead. It just smells funny...
