------- Comment From h.carst...@de.ibm.com 2018-04-14 06:40 EDT-------
(In reply to comment #14)
> 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.

The bug is close to impossible to reproduce, since it's a hard to hit
race. So I could only verify that the kernel/system still boots and did
some basic tests - which all passed.

------- Comment From h.carst...@de.ibm.com 2018-04-14 06:43 EDT-------
(In reply to comment #14)
> 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?

Yes, the bug is also present in v4.13. I attached a kernel patch agains
vanilla v4.13 that is supposed to fix the bug for this kernel version as

** Tags removed: bugnameltc-166421 kernel-da-key severity-high

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  [Ubuntu 16.04] kernel: fix rwlock implementation

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