On Mon, Oct 22, 2018 at 01:28:42PM +0100, Sean Young wrote: > On Mon, Oct 22, 2018 at 12:30:29PM +0100, Hans Verkuil wrote: > > On 10/22/2018 11:14 AM, Sean Young wrote: > > > Would you be able to test the following patch please? > > > > Sean, > > > > I think you should be able to test this with the vivid driver. Load the vivid driver, > > run: > > > > cec-ctl --tv; cec-ctl -d1 --playback > > > > Then: > > > > cec-ctl -d1 -t0 --user-control-pressed ui-cmd=F5 > > Ah, thanks. That will help with testing/reproducing. > > > That said, I tried this, but it doesn't crash for me, but perhaps I need to run > > some RC command first... > > Hmm I think those commands should be enough. It probably needs > CONFIG_DEBUG_SPINLOCK to detect the uninitialized spinlock. I'm trying it now. Yes, that turned out to work. With CONFIG_DEBUG_SPINLOCK on, it goes bang every time. With the patch, the problem goes away. Without CONFIG_DEBUG_SPINLOCK we're going into undefined behaviour, so Torbjorn you're only seeing the oops occassionally (and which is why it has not been observed or reported before). Thanks, Sean
