From: Dave Jones <davej@codemonkey.org.uk>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: UBSAN: run-time undefined behavior sanity checker
Date: Mon, 1 Feb 2016 17:18:52 -0500 [thread overview]
Message-ID: <20160201221852.GA23344@codemonkey.org.uk> (raw)
In-Reply-To: <56AF830E.1050707@virtuozzo.com>
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
prev parent reply other threads:[~2016-02-01 22:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160121205717.AF61F661293@gitolite.kernel.org>
2016-01-22 5:15 ` UBSAN: run-time undefined behavior sanity checker Dave Jones
2016-01-22 16:43 ` Andrey Ryabinin
2016-01-22 17:00 ` Dave Jones
2016-01-25 14:03 ` Andrey Ryabinin
[not found] ` <20160126165322.GA24364@codemonkey.org.uk>
2016-02-01 16:08 ` Andrey Ryabinin
2016-02-01 22:18 ` Dave Jones [this message]
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