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From: Thomas Gleixner <tglx@linutronix.de>
To: paulmck@kernel.org
Cc: syzbot <syzbot+f2ceae48bb0c0ab08b9d@syzkaller.appspotmail.com>,
	bp@alien8.de, dwmw@amazon.co.uk, hpa@zytor.com,
	linux-kernel@vger.kernel.org, mingo@redhat.com,
	syzkaller-bugs@googlegroups.com, x86@kernel.org
Subject: Re: [syzbot] WARNING in rcu_core
Date: Mon, 30 Aug 2021 21:39:54 +0200	[thread overview]
Message-ID: <875yvmhgc5.ffs@tglx> (raw)
In-Reply-To: <20210830170647.GT4156@paulmck-ThinkPad-P17-Gen-1>

On Mon, Aug 30 2021 at 10:06, Paul E. McKenney wrote:
> On Mon, Aug 30, 2021 at 12:51:39PM +0200, Thomas Gleixner wrote:
>
> This looks like a use-after-free in a structure that unions the rcu_head
> structure with something else.
>
> Would adding a mem_dump_obj() somewhere in the debug-object code be
> helpful?

At least for the case where the object is not available in the debug
objects tracking.

> (Or propagate a return value out, similar to that of
> debug_object_activate()?)

That might be useful for some callers as well.

Thanks,

        tglx


      reply	other threads:[~2021-08-30 19:39 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-30  9:45 [syzbot] WARNING in rcu_core syzbot
2021-08-30 10:51 ` Thomas Gleixner
2021-08-30 17:06   ` Paul E. McKenney
2021-08-30 19:39     ` Thomas Gleixner [this message]

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