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

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Message-ID: <1439452683-964514-1-git-send-email-kafai@fb.com>
Date:	Thu, 13 Aug 2015 00:58:00 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	netdev <netdev@...r.kernel.org>,
	"Steinar H. Gunderson" <sgunderson@...foot.com>
CC:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	FB Kernel Team <kernel-team@...com>
Subject: [PATCH RFC net 0/3] ipv6: Fix potential deadlock when creating pcpu rt

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!

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