netdev - Re: [PATCH RFC net 0/3] ipv6: Fix potential deadlock when creating pcpu rt

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Date:	Thu, 13 Aug 2015 17:29:09 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kafai@...com
Cc:	netdev@...r.kernel.org, sgunderson@...foot.com,
	hannes@...essinduktion.org, kernel-team@...com
Subject: Re: [PATCH RFC net 0/3] ipv6: Fix potential deadlock when creating
 pcpu rt

From: Martin KaFai Lau <kafai@...com>
Date: Thu, 13 Aug 2015 00:58:00 -0700

> This patch series fixes a potential deadlock when creating a pcpu rt.
> It happens when dst_alloc() decided to run gc. Something like this:
> 
> read_lock(&table->tb6_lock);
> ip6_rt_pcpu_alloc()
> => dst_alloc()
> => ip6_dst_gc()
> => write_lock(&table->tb6_lock); /* oops */
> 
> Patch 1 and 2 are some prep works.
> Patch 3 is the fix.
> 
> Original report: https://bugzilla.kernel.org/show_bug.cgi?id=102291
> 
> Steinar, the patches can also be applied to 4.2-rc5 (I just tried).
> Can you help to test them? Thanks!

This series looks fine to me.
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