netdev - Re: Crash due to mutex genl_lock called from RCU context

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Date:   Tue, 29 Nov 2016 19:49:00 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     herbert@...dor.apana.org.au
Cc:     xiyou.wangcong@...il.com, eric.dumazet@...il.com,
        subashab@...eaurora.org, tgraf@...g.ch, netdev@...r.kernel.org
Subject: Re: Crash due to mutex genl_lock called from RCU context

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Mon, 28 Nov 2016 19:22:12 +0800

> netlink: Call cb->done from a worker thread
> 
> The cb->done interface expects to be called in process context.
> This was broken by the netlink RCU conversion.  This patch fixes
> it by adding a worker struct to make the cb->done call where
> necessary.
> 
> Fixes: 21e4902aea80 ("netlink: Lockless lookup with RCU grace...")
> Reported-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied and queued up for -stable, thanks Herbert.