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[Bug 1596412] Re: On native_write_msr_safe function issue

 

This patch bellow set type notrace on all required function because
trace is explycit performed and not need to put auto by compile on begin
and end of function. Whit this patch applied only on perf must have proc
stalled.

** Patch added: "apply_on_nes.patch"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1596412/+attachment/4690917/+files/apply_on_nes.patch

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Title:
  On native_write_msr_safe function issue

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Bellow is content of perf report:
         │                                                                                                        ◆
         │                                                                                                        ▒
         │                                                                                                        ▒
         │    Disassembly of section load0:                                                                       ▒
         │                                                                                                        ▒
         │    ffffffff810644b0 <load0>:                                                                           ▒
         │      push   %rbp                                                                                       ▒
         │      mov    %esi,%eax                                                                                  ▒
         │      mov    %edi,%ecx                                                                                  ▒
         │      mov    %rsp,%rbp                                                                                  ▒
         │      wrmsr                                                                                             ▒
  100,00 │      xor    %eax,%eax                                                                                  ▒
         │      pop    %rbp                                                                                       ▒
         │    ← retq                                                                                              ▒
         │      xchg   %ax,%ax                                                                                    ▒
                                
  Process stall on do_trace_write_msr.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-24-generic 4.4.0-24.43
  ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
  Uname: Linux 4.4.0-24-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  asu        2888 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Mon Jun 27 07:45:26 2016
  InstallationDate: Installed on 2016-04-29 (58 days ago)
  InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  IwConfig:
   lo        no wireless extensions.
   
   enp1s0    no wireless extensions.
  MachineType: Olidata S.p.A. ALABAMA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-24-generic root=/dev/mapper/192--168--0--108--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-24-generic N/A
   linux-backports-modules-4.4.0-24-generic  N/A
   linux-firmware                            1.157.1
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/08/2008
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: S0101
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: To be filled by O.E.M.
  dmi.board.vendor: To be filled by O.E.M.
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrS0101:bd07/08/2008:svnOlidataS.p.A.:pnALABAMA:pvrToBeFilledByO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: ALABAMA
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: Olidata S.p.A.

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References