*** This bug is a duplicate of bug 1745290 ***

** This bug has been marked a duplicate of bug 1745290
   panic or arbitrary jump due to coding error in retpoline for system call 

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  coding error in retpoline for system call entry in Ubuntu 4.13.0-31

Status in linux package in Ubuntu:
  Fix Released
Status in linux-hwe package in Ubuntu:
  Fix Released

Bug description:
  Logic error came from the following commit, looks to be introduced at

  commit d2e0236f395e876f5303fb5021e4fe6eea881402
  Author: Tim Chen <tim.c.c...@linux.intel.com>
  Date: Wed Nov 8 16:30:06 2017 -0800

      x86/entry: Use retpoline for syscall's indirect calls

  $ git describe --contains d2e0236f395e876f5303fb5021e4fe6eea881402

  This patch was included in one of the proposed patchsets to mitigate
  spectre, but was superceded in later ones which did not contain the
  error, and did not land in the upstream kernel. It does not affect the
  4.4 derived or earlier kernels.

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