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As soon as rcu_read_unlock() is called, there is no guarantee current thread can safely derefence t pointer, rcu protected. Fix is to copy t->alloc_size in a temporary variable. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>