linux-kernel - Re: [RFC PATCH] lib/ubsan: Don't seralize UBSAN report

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Message-ID: <20191007161457.zgenqi6fts3khmkg@linutronix.de>
Date:   Mon, 7 Oct 2019 18:14:57 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Julien Grall <julien.grall@....com>
Cc:     linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        tglx@...utronix.de, aryabinin@...tuozzo.com, rostedt@...dmis.org,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [RFC PATCH] lib/ubsan: Don't seralize UBSAN report

On 2019-09-20 11:08:35 [+0100], Julien Grall wrote:
> At the moment, UBSAN report will be serialized using a spin_lock(). On
> RT-systems, spinlocks are turned to rt_spin_lock and may sleep. This will
> result to the following splat if the undefined behavior is in a context
> that can sleep:
…
> So the lock usefulness seems pretty limited. Rather than trying to
> accomodate RT-system by switching to a raw_spin_lock(), the lock is now
> completely dropped.
> 
> Reported-by: Andre Przywara <andre.przywara@....com>
> Signed-off-by: Julien Grall <julien.grall@....com>

I just applied this to my RT tree. Is someone here feeling responsible
to apply this upstream?

Sebastian