From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH -tip ] [BUGFIX] kprobes: Skip kretprobe hit in NMI context to avoid deadlock
Date: Fri, 1 Aug 2014 15:18:44 +0530 [thread overview]
Message-ID: <20140801094844.GA4329@in.ibm.com> (raw)
In-Reply-To: <20140801084254.12330.64728.stgit@kbuild-fedora.novalocal>
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@hitachi.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
next prev parent reply other threads:[~2014-08-01 9:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-01 8:42 [PATCH -tip ] [BUGFIX] kprobes: Skip kretprobe hit in NMI context to avoid deadlock Masami Hiramatsu
2014-08-01 9:48 ` Ananth N Mavinakayanahalli [this message]
2014-08-01 11:00 ` Ingo Molnar
2014-08-02 6:37 ` Masami Hiramatsu
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