No i'm not have time to do on this momment i have stock kernel. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1594402
Title:
On function vmacache_find issue.
Status in linux package in Ubuntu:
Incomplete
Bug description:
This is verry bad on file mm/vmacache.c function vmacache_find try to run
with nonexistent pointer.
result of perl report is bellow:
vmacache_find /proc/kcore
│
◆
│
▒
│
▒
│ Disassembly of section load0:
▒
│
▒
│ ffffffff811b87c0 <load0>:
▒
│ nop
▒
│ mov %gs:0xd3c0,%rcx
▒
│ xor %eax,%eax
▒
│ cmp 0x380(%rcx),%rdi
▒
20,00 │ ↓ je 1a
▒
│19: ← retq
▒
│1a: testb $0x20,0x16(%rcx)
▒
20,00 │ ↓ je 22
▒
│ repz retq
▒
│22: mov 0x10(%rdi),%edx
▒
20,00 │ cmp 0x390(%rcx),%edx
▒
│ ↓ je 60
▒
│ mov %edx,0x390(%rcx)
▒
│ movq $0x0,0x398(%rcx)
▒
│ movq $0x0,0x3a0(%rcx)
▒
│ movq $0x0,0x3a8(%rcx)
▒
│ movq $0x0,0x3b0(%rcx)
▒
│ ← retq
▒
│60: xor %edx,%edx
▒
│62: movslq %edx,%rax
▒
│ mov 0x398(%rcx,%rax,8),%rax
▒
│ test %rax,%rax
▒
│ ↓ je 83
▒
20,00 │ cmp 0x40(%rax),%rdi
▒
20,00 │ ↓ jne 8e
▒
│ cmp %rsi,(%rax)
▒
│ ↓ ja 83
▒
│ cmp 0x8(%rax),%rsi
▒
│ ↑ jb 19
This bug have negative impact on players running on browser firefox
and icrease latency of multiple media applications
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/pcmC0D0p: asu 3110 F...m pulseaudio
/dev/snd/controlC0: asu 3110 F.... pulseaudio
CurrentDesktop: MATE
Date: Mon Jun 20 17:01:20 2016
InstallationDate: Installed on 2016-04-29 (52 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.
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