From: Thomas Gleixner <tglx@linutronix.de>
To: kernel test robot <fengguang.wu@intel.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tomasz Nowicki <tn@semihalf.com>,
Christoffer Dall <christoffer.dall@linaro.org>,
Sasha Levin <alexander.levin@verizon.com>,
"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
Johannes Berg <johannes.berg@intel.com>
Subject: Re: [linux-stable] 4fc2942b6e kernel BUG at kernel/time/hrtimer.c:109!
Date: Fri, 17 Feb 2017 10:28:03 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.20.1702171014430.3536@nanos> (raw)
In-Reply-To: <20170217052607.glbumukvoz4pilvt@wfg-t540p.sh.intel.com>
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.
>
> 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);
next prev parent reply other threads:[~2017-02-17 9:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-17 5:26 [linux-stable] 4fc2942b6e kernel BUG at kernel/time/hrtimer.c:109! kernel test robot
2017-02-17 9:28 ` Thomas Gleixner [this message]
2017-02-17 10:09 ` Marc Zyngier
2017-02-17 10:16 ` Thomas Gleixner
2017-02-17 10:31 ` Marc Zyngier
2017-02-17 12:49 ` Fengguang Wu
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