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Re: [RFC PATCH v1.9 00/14] livepatch: hybrid consistency model

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> - actually test it

I did slightly and it partially worked and partially it did not.

When I applied sample livepatch module, /proc/cmdline was patched and when 
I called 'cat /proc/cmdline' I got the correct livepatched message. So far 
so good. But the patching itself never finished because of many processes 
with unreliable stacks. It almost looked like every sleeping process was 
reported. I haven't debugged that yet.

Second, I have a simple test case. Kthread which sleeps in to-be-patched 
function foo() for a while and then it sleeps somewhere else and that in a 
loop. After live patch application the kthread is reported to have 
unreliable stack and it is not migrated. The good thing is that also the 
function foo() from the old universe is called and thus the consistency 
model works.

So I guess there is some problem in a stack checking...

Miroslav

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[RFC PATCH v1.9 00/14] livepatch: hybrid consistency model Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
  [RFC PATCH v1.9 03/14] x86/asm/head: standardize the bottom of the stack for idle tasks Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
  [RFC PATCH v1.9 09/14] livepatch: remove unnecessary object loaded check Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
  [RFC PATCH v1.9 11/14] livepatch: store function sizes Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
  [RFC PATCH v1.9 13/14] livepatch: add /proc/<pid>/patch_status Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
    Re: [RFC PATCH v1.9 13/14] livepatch: add /proc/<pid>/patch_status Jiri Slaby <jslaby@suse.cz> - 2016-03-31 11:40 +0200
      Re: [RFC PATCH v1.9 13/14] livepatch: add /proc/<pid>/patch_status Jiri Slaby <jslaby@suse.cz> - 2016-03-31 11:50 +0200
  [RFC PATCH v1.9 02/14] x86/asm/head: use a common function for starting CPUs Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
  [RFC PATCH v1.9 07/14] x86/stacktrace: add function for detecting reliable stack traces Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
    Re: [RFC PATCH v1.9 07/14] x86/stacktrace: add function for detecting  reliable stack traces Miroslav Benes <mbenes@suse.cz> - 2016-03-31 15:10 +0200
  [RFC PATCH v1.9 12/14] livepatch: create per-task consistency model Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
    Re: [RFC PATCH v1.9 12/14] livepatch: create per-task consistency  model Miroslav Benes <mbenes@suse.cz> - 2016-03-31 15:20 +0200
  [RFC PATCH v1.9 08/14] livepatch: separate enabled and patched states Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
  [RFC PATCH v1.9 04/14] x86: move _stext marker before head code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-03-25 20:40 +0100
  Re: [RFC PATCH v1.9 00/14] livepatch: hybrid consistency model Miroslav Benes <mbenes@suse.cz> - 2016-03-31 15:00 +0200
  Re: [RFC PATCH v1.9 00/14] livepatch: hybrid consistency model Petr Mladek <pmladek@suse.com> - 2016-04-01 15:40 +0200
    Re: [RFC PATCH v1.9 00/14] livepatch: hybrid consistency model Petr Mladek <pmladek@suse.com> - 2016-04-01 17:40 +0200
  Re: [RFC PATCH v1.9 00/14] livepatch: hybrid consistency model Miroslav Benes <mbenes@suse.cz> - 2016-04-01 15:40 +0200

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