added documentation for kmem issue on linux kernels 3.x

This adds issue documentation for a major problem with memory accounting
that occurs Linux kernel versions 3.x

crate/content.md

@@ -30,6 +30,12 @@ Read more:
 
 ## Issues
 
+### Memory Accounting
+
+The combinations of Linux kernel version 3.x and Docker >= 1.12 could lead to a major problem with memory accounting causing the kernel to kill the CrateDB process in the container. This problems occurs because of a [slab shrinker issue](https://lwn.net/Articles/628829/) that is fixed in kernel versions >= 4.0.
+
+### Others
+
 For issue specific to the CrateDB Docker image, report issues via [the `docker-crate` GitHub issue tracker](https://github.com/crate/docker-crate/issues)
 
 For issues with CrateDB itself, report issues via [the `crate` GitHub issue tracker](https://github.com/crate/crate/issues)