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SubjectRe: [lkp-robot] [watchdog/softlockup] 4808e7a5dc: BUG:KASAN:null-ptr-deref_in_h
On Wed, Jun 13, 2018 at 01:08:38PM +0800, kernel test robot wrote:
> [ 0.037000] BUG: KASAN: null-ptr-deref in hrtimer_active+0x70/0xa0
> [ 0.037000] Read of size 4 at addr 0000000000000010 by task swapper/1
> [ 0.037000]
> [ 0.037000] CPU: 0 PID: 1 Comm: swapper Tainted: G T 4.17.0-11348-g4808e7a #1
> [ 0.037000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> [ 0.037000] Call Trace:
> [ 0.037000] ? kasan_report+0xe3/0x360
> [ 0.037000] ? hrtimer_active+0x70/0xa0
> [ 0.037000] ? hrtimer_try_to_cancel+0x17/0x210
> [ 0.037000] ? hrtimer_cancel+0x15/0x20
> [ 0.037000] ? softlockup_stop_fn+0x11/0x20
> [ 0.037000] ? lockup_detector_reconfigure+0x25/0xa0
> [ 0.037000] ? lockup_detector_init+0x51/0x5d
> [ 0.037000] ? kernel_init_freeable+0xa9/0x243
> [ 0.037000] ? rest_init+0xd0/0xd0
> [ 0.037000] ? kernel_init+0xf/0x120
> [ 0.037000] ? rest_init+0xd0/0xd0
> [ 0.037000] ? ret_from_fork+0x24/0x30

ARGH, I thought I fixed that one..

I think that'll cure things, but let me do a KASAN build myself.

--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -587,8 +587,8 @@ static __init void lockup_detector_setup
return;

mutex_lock(&watchdog_mutex);
- softlockup_initialized = true;
lockup_detector_reconfigure();
+ softlockup_initialized = true;
mutex_unlock(&watchdog_mutex);
}

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