Public bug reported:

== Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 ==
Livepatch has a consistency model which is a hybrid of kGraft and kpatch:  it 
uses kGraft's per-task consistency and syscall barrier switching combined with 
kpatch's stack trace switching. The current approach is stack checking of 
sleeping tasks.  If no affected functions are on the stack of a given task, the 
task is patched.  In most cases this will patch most or all of the tasks on the 
first try.  Otherwise, it'll keep trying periodically.  This patch implements 
the reliable stack tracing for consistency model a.k.a 
HAVE_RELIABLE_STACKTRACE. 

This will help in switching livepatching implementation to basic per-
task consistency model. It is the foundation, which will help us enable
security patches changing function or data semantics. This is the
biggest remaining piece needed on ppc64le to make livepatch more
generally useful.

https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac

** Affects: ubuntu-power-systems
     Importance: High
     Assignee: Canonical Kernel Team (canonical-kernel-team)
         Status: Triaged

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-167879 severity-critical 
targetmilestone-inin1804 triage-g

** Tags added: architecture-ppc64le bugnameltc-167879 severity-critical
targetmilestone-inin1804

** Changed in: ubuntu
     Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage 
(ubuntu-power-triage)

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1771844

Title:
  powerpc/livepatch: Implement reliable stack tracing for the
  consistency model

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Kamalesh Babulal - 2018-05-15 09:37:52 ==
  Livepatch has a consistency model which is a hybrid of kGraft and kpatch:  it 
uses kGraft's per-task consistency and syscall barrier switching combined with 
kpatch's stack trace switching. The current approach is stack checking of 
sleeping tasks.  If no affected functions are on the stack of a given task, the 
task is patched.  In most cases this will patch most or all of the tasks on the 
first try.  Otherwise, it'll keep trying periodically.  This patch implements 
the reliable stack tracing for consistency model a.k.a 
HAVE_RELIABLE_STACKTRACE. 

  This will help in switching livepatching implementation to basic per-
  task consistency model. It is the foundation, which will help us
  enable security patches changing function or data semantics. This is
  the biggest remaining piece needed on ppc64le to make livepatch more
  generally useful.

  
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=df78d3f6148092d33a9a24c7a9cfac

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