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** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1602405
Title:
On copy_page_to_iter_iovec function issue.
Status in linux package in Ubuntu:
Confirmed
Bug description:
Below is result of perf report:
opy_page_to_iter_iovec /proc/kcore
│ Disassembly of section load0:
▒
│
▒
│ ffffffff813ff690 <load0>:
▒
75,00 │ mov 0x10(%rcx),%rax
▒
│ cmp %rdx,%rax
▒
│ cmovbe %rax,%rdx
▒
│ test %rdx,%rdx
▒
│ ↓ je 29a
◆
│ push %rbp
▒
│ mov %rsi,%r8
▒
│ mov %rsp,%rbp
▒
│ push %r15
▒
│ push %r14
▒
│ push %r13
▒
│ push %r12
▒
│ mov %rdx,%r15
▒
│ push %rbx
▒
│ mov %rcx,%rbx
▒
│ sub $0x20,%rsp
▒
│ mov 0x18(%rcx),%r13
▒
│ mov 0x8(%rcx),%r12
▒
│ mov 0x8(%r13),%r14
▒
│ mov %r12,%rax
▒
│ add 0x0(%r13),%rax
▒
│ sub %r12,%r14
▒
│ cmp %rdx,%r14
▒
│ mov %rax,%rsi
▒
│ mov %rax,-0x38(%rbp)
▒
│ cmova %rdx,%r14
▒
│ test %r14d,%r14d
▒
│ movslq %r14d,%rdx
▒
│ ↓ je 93
▒
│ xor %eax,%eax
▒
│ nop
▒
│ movb $0x0,(%rsi)
▒
25,00 │ nop
...............................
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 3122 F.... pulseaudio
CurrentDesktop: MATE
Date: Tue Jul 12 22:59:12 2016
InstallationDate: Installed on 2016-04-29 (74 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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