** Description changed:

- The following upstream patch is missing:
+ [SRU Justification]
  
- - 993e4c929a07 netns: fix NLM_F_ECHO mechanism for RTM_NEWNSID
+ [Impact]
+ 
+ The netlink flag NLM_F_ECHO has no effect with the rtnetlink command
+ RTM_NEWNSID. This has been fixed in v5.4 by the upstream commit
+ 993e4c929a07 ("netns: fix NLM_F_ECHO mechanism for RTM_NEWNSID"). The
+ bug is here since v4.0.
  
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=993e4c929a07
+ 
+ == Fix ==
+ 
+ Backport the requested patches to Disco (5.0), Bionic (4.15) and
+ Xenial (4.4).
+ 
+ == Risk of Regregression ==
+ 
+ This patch is quite trivial and limited to the code that manage
+ RTM_[NEW|GET]NSID commands. Risk should be low.

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https://bugs.launchpad.net/bugs/1849085

Title:
  netns: fix NLM_F_ECHO mechanism for RTM_NEWNSID

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