Public bug reported:

After pop    %rbp is running instructions:
Bellow is result of perf report:
       │                                                                        
                                ◆
       │                                                                        
                                ▒
       │                                                                        
                                ▒
       │    Disassembly of section load0:                                       
                                ▒
       │                                                                        
                                ▒
       │    ffffffff81823af0 <load0>:                                           
                                ▒
 50,00 │      nop                                                               
                                ▒
       │      movq   $0x0,0x18(%rdi)                                            
                                ▒
       │      lock   incl   (%rdi)                                              
                                ▒
 50,00 │    ↓ jg     1c                                                         
                                ▒
       │      push   %rbp                                                       
                                ▒
       │      mov    %rsp,%rbp                                                  
                                ▒
       │      callq  0xffffffff81823aa0                                         
                                ▒
       │      pop    %rbp                                                       
                                ▒
       │1c:   repz   retq                                                       
                                ▒
       │      xchg   %ax,%ax

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        3226 F.... pulseaudio
CurrentDesktop: MATE
Date: Tue Jun 14 14:45:44 2016
InstallationDate: Installed on 2016-04-29 (45 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
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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1592381

Title:
  On function mutex_unlock issue

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