linux-kernel - Re: [PATCH -tip ] [BUGFIX] kprobes: Skip kretprobe hit in NMI context to avoid deadlock

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Message-ID: <20140801094844.GA4329@in.ibm.com>
Date:	Fri, 1 Aug 2014 15:18:44 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH -tip ] [BUGFIX] kprobes: Skip kretprobe hit in NMI
 context to avoid deadlock

On Fri, Aug 01, 2014 at 08:42:54AM +0000, Masami Hiramatsu wrote:
> Skip kretprobe hit in NMI context, because if an NMI happens
> inside the critical section protected by kretprobe_table.lock
> and another(or same) kretprobe hit, pre_kretprobe_handler
> tries to lock kretprobe_table.lock again.
> Normal interrupts have no problem because they are disabled
> with the lock.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

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