I built a 16.04(4.4 based kenrel) with the requested patch.

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1761674/xenial

Can you test this kernel and see if it resolves this bug?

Note, to test this kernel, you need to install both the linux-image and
linux-image-extra .deb packages.


I also tried to apply this patch to the 4.13 based 17.10 Artful kernel.  
However, I'll have to perform allot of back porting for Artful.  For example, 
the patch relies on _raw_compare_and_swap().  However, this function was 
removed in v4.12-rc1 by commit 02c503f.  Can you confirm this patch is needed 
in Artful, and if you recommend any prereq patches?

** Changed in: linux (Ubuntu Artful)
       Status: In Progress => Incomplete

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https://bugs.launchpad.net/bugs/1761674

Title:
  [Ubuntu 16.04] kernel: fix rwlock implementation

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