Public bug reported: Below is result of perf report:
find_vma /proc/kcore
│
◆
│
▒
│
▒
│ Disassembly of section load0:
▒
│
▒
│ ffffffff811c49c0 <load0>:
▒
14,29 │ nop
▒
│ push %rbp
▒
│ mov %rsp,%rbp
▒
│ push %r12
▒
│ push %rbx
▒
│ mov %rdi,%r12
▒
│ mov %rsi,%rbx
▒
│ sub $0x8,%rsp
▒
│ callq 0xffffffff811b8b50
▒
│ test %rax,%rax
▒
│ ↓ je 29
▒
│20: add $0x8,%rsp
▒
│ pop %rbx
▒
│ pop %r12
▒
│ pop %rbp
▒
│ ← retq
▒
│29: mov 0x8(%r12),%rdx
▒
│ test %rdx,%rdx
▒
│ ↓ jne 48
▒
│ ↑ jmp 20
▒
│35: cmp -0x20(%rdx),%rbx
▒
14,29 │ lea -0x20(%rdx),%rax
▒
│ ↓ jae 54
▒
│ mov 0x10(%rdx),%rdx
▒
14,29 │43: test %rdx,%rdx
▒
│ ↓ je 54
▒
│48: cmp -0x18(%rdx),%rbx
▒
57,14 │ ↑ jb 35
▒
│ mov 0x8(%rdx),%rdx
..................................
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 3121 F.... pulseaudio
CurrentDesktop: MATE
Date: Mon Jul 11 13:32:25 2016
InstallationDate: Installed on 2016-04-29 (72 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 1.157.2
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
** Attachment added: "Tested on linux-4.6.2"
https://bugs.launchpad.net/bugs/1600763/+attachment/4698741/+files/update_pos_or_address.patch
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https://bugs.launchpad.net/bugs/1600763
Title:
On find_vma function issue.
Status in linux package in Ubuntu:
New
Bug description:
Below is result of perf report:
find_vma /proc/kcore
│
◆
│
▒
│
▒
│ Disassembly of section load0:
▒
│
▒
│ ffffffff811c49c0 <load0>:
▒
14,29 │ nop
▒
│ push %rbp
▒
│ mov %rsp,%rbp
▒
│ push %r12
▒
│ push %rbx
▒
│ mov %rdi,%r12
▒
│ mov %rsi,%rbx
▒
│ sub $0x8,%rsp
▒
│ callq 0xffffffff811b8b50
▒
│ test %rax,%rax
▒
│ ↓ je 29
▒
│20: add $0x8,%rsp
▒
│ pop %rbx
▒
│ pop %r12
▒
│ pop %rbp
▒
│ ← retq
▒
│29: mov 0x8(%r12),%rdx
▒
│ test %rdx,%rdx
▒
│ ↓ jne 48
▒
│ ↑ jmp 20
▒
│35: cmp -0x20(%rdx),%rbx
▒
14,29 │ lea -0x20(%rdx),%rax
▒
│ ↓ jae 54
▒
│ mov 0x10(%rdx),%rdx
▒
14,29 │43: test %rdx,%rdx
▒
│ ↓ je 54
▒
│48: cmp -0x18(%rdx),%rbx
▒
57,14 │ ↑ jb 35
▒
│ mov 0x8(%rdx),%rdx
..................................
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 3121 F.... pulseaudio
CurrentDesktop: MATE
Date: Mon Jul 11 13:32:25 2016
InstallationDate: Installed on 2016-04-29 (72 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 1.157.2
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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