Added known issue of rte_abort taking a long time
on FreeBSD due to recent memory subsystem rework.

Signed-off-by: Reshma Pattan <redacted>
---
  doc/guides/rel_notes/release_18_05.rst | 15 +++++++++++++++
  1 file changed, 15 insertions(+)

diff --git a/doc/guides/rel_notes/release_18_05.rst b/doc/guides/rel_notes/release_18_05.rst
index 3dcb62538..c01781956 100644
--- a/doc/guides/rel_notes/release_18_05.rst
+++ b/doc/guides/rel_notes/release_18_05.rst

@@ -485,6 +485,21 @@ Known Issues
    dpdk-pdump example and any other applications using librte_pdump, cannot work
    with older version DPDK primary applications.
  
+* **rte_abort takes a long time on FreeBSD due to memory subsytsem rework.**
+
+  With the recent memory subsystem changes, DPDK processes now allocate a large
+  area of virtual memory address space. During rte_abort FreeBSD will dump the
+  contents of the whole reserved memory range, not just the used portion, to a
+  core dump file. Write this large core file can take a significant amount of
+  time, causing processes to appear hung on the system.
+
+  The work around for the issue is to set the system resource limits for core
+  dumps before running any tests e.g."limit coredumpsize 0". This will
+  effectively disable core dumps on FreeBSD. If they are not to be completely
+  disabled, a suitable limit, e.g. 1G might be specified instead of 0. This
+  needs to be run per-shell session, or before every test run. This change
+  can also be made persistent by adding "kern.coredump=0" to /etc/sysctl.conf
+
  
  Shared Library Versions
  -----------------------