releases/3.19.2/flowcache-fix-kernel-panic-in-flow_cache_flush_task.patch

   1 From foo@baz Wed Mar 11 11:44:33 CET 2015
   2 From: Miroslav Urbanek <mu@miroslavurbanek.com>
   3 Date: Thu, 5 Feb 2015 16:36:50 +0100
   4 Subject: flowcache: Fix kernel panic in flow_cache_flush_task
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 From: Miroslav Urbanek <mu@miroslavurbanek.com>
  10
  11 [ Upstream commit 233c96fc077d310772375d47522fb444ff546905 ]
  12
  13 flow_cache_flush_task references a structure member flow_cache_gc_work
  14 where it should reference flow_cache_flush_task instead.
  15
  16 Kernel panic occurs on kernels using IPsec during XFRM garbage
  17 collection. The garbage collection interval can be shortened using the
  18 following sysctl settings:
  19
  20 net.ipv4.xfrm4_gc_thresh=4
  21 net.ipv6.xfrm6_gc_thresh=4
  22
  23 With the default settings, our productions servers crash approximately
  24 once a week. With the settings above, they crash immediately.
  25
  26 Fixes: ca925cf1534e ("flowcache: Make flow cache name space aware")
  27 Reported-by: Tomáš Charvát <tc@excello.cz>
  28 Tested-by: Jan Hejl <jh@excello.cz>
  29 Signed-off-by: Miroslav Urbanek <mu@miroslavurbanek.com>
  30 Acked-by: Eric Dumazet <edumazet@google.com>
  31 Signed-off-by: David S. Miller <davem@davemloft.net>
  32 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  33 ---
  34  net/core/flow.c |    2 +-
  35  1 file changed, 1 insertion(+), 1 deletion(-)
  36
  37 --- a/net/core/flow.c
  38 +++ b/net/core/flow.c
  39 @@ -379,7 +379,7 @@ done:
  40  static void flow_cache_flush_task(struct work_struct *work)
  41  {
  42         struct netns_xfrm *xfrm = container_of(work, struct netns_xfrm,
  43 -                                               flow_cache_gc_work);
  44 +                                               flow_cache_flush_work);
  45         struct net *net = container_of(xfrm, struct net, xfrm);
  46
  47         flow_cache_flush(net);