Messages in this thread | | | Date | Mon, 1 Feb 2016 17:18:52 -0500 | From | Dave Jones <> | Subject | Re: UBSAN: run-time undefined behavior sanity checker |
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On Mon, Feb 01, 2016 at 07:08:46PM +0300, Andrey Ryabinin wrote:
> > > > tried it on hangs the same way, really early. Any thoughts on how to chase this down ? > > > Try to disable instrumentation for early code, like in the patch bellow. > > This didn't help. > > So after I enabled UBSAN_ALIGNMENT in your config, the kernel didn't boot. > That is because unaligned access happens before lockdep_init() so ubsan callback takes the > spinlock before locked_init() which is not allowed.
> Could you try it without CONFIG_DEBUG_LOCKDEP? > Or alternatively with patch like this:
Tried with the patch, seems to work fine now.
thanks, Dave
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