Public bug reported:
below is result of perf report:
finish_task_switch /proc/kcore
│
▒
│
▒
│
▒
│ Disassembly of section load0:
▒
│
▒
│ ffffffff810a96e0 <load0>:
▒
60,00 │ nop
▒
│ push %rbp
◆
│ mov %rsp,%rbp
▒
│ push %r15
▒
│ push %r14
▒
│ push %r13
▒
│ mov %rdi,%r13
▒
│ push %r12
▒
│ mov $0x16d00,%r12
▒
│ push %rbx
▒
│ add %gs:0x7ef60a84(%rip),%r12
▒
│ mov %gs:0x7ef63c44(%rip),%r9d
▒
│ and $0x7fffffff,%r9d
▒
│ mov 0x8f8(%r12),%r14
▒
20,00 │ ↓ jne 1be
▒
│ 41: movq $0x0,0x8f8(%r12)
▒
│ mov 0x0(%r13),%r15
▒
│ mov %gs:0xd3c0,%rbx
▒
│ nop
▒
│ 5f: nop
▒
│ 64: movl $0x0,0x28(%r13)
▒
│ mov %r12,%rdi
▒
│ movb $0x0,(%rdi)
▒
20,00 │ nop
▒
│ sti
...............................
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-28-generic 4.4.0-28.47
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: asu 3168 F.... pulseaudio
CurrentDesktop: XFCE
Date: Wed Jul 6 11:58:50 2016
InstallationDate: Installed on 2016-04-29 (67 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-4.4.0-28-generic
root=/dev/mapper/192--168--0--108--vg-root ro
RelatedPackageVersions:
linux-restricted-modules-4.4.0-28-generic N/A
linux-backports-modules-4.4.0-28-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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
** Patch added: "Tested on linux-4.6.2"
https://bugs.launchpad.net/bugs/1599430/+attachment/4696295/+files/inline_on_finish_task_switch.patch
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https://bugs.launchpad.net/bugs/1599430
Title:
On finish_task_switch function issue.
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