Public bug reported:

I have experienced a full system lockup, not even SysRq+REISUB could
reboot the system. In the kernel logs I noticed multiple
tcp_fastretrans_alert warnings and the upstream bug
(https://bugzilla.kernel.org/show_bug.cgi?id=195835,
https://bugzilla.kernel.org/show_bug.cgi?id=60779) seems to indicate
this may be the reason.

In the attached kernel log, the hang happened immediately before the
last reboot.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-25-generic 4.13.0-25.29
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC3:  lastique   3183 F.... pulseaudio
 /dev/snd/controlC1:  lastique   3183 F.... pulseaudio
 /dev/snd/controlC2:  lastique   3183 F.... pulseaudio
 /dev/snd/controlC0:  lastique   3183 F.... pulseaudio
CurrentDesktop: KDE
Date: Fri Jan 19 22:26:36 2018
InstallationDate: Installed on 2015-05-01 (993 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: System manufacturer System Product Name
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-25-generic 
root=UUID=a03f1835-52f9-4409-9da7-fe45770637ae ro quiet splash nomdmonddf 
nomdmonisw
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-25-generic N/A
 linux-backports-modules-4.13.0-25-generic  N/A
 linux-firmware                             1.169.1
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to artful on 2017-11-03 (76 days ago)
dmi.bios.date: 11/09/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3603
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8Z68-V PRO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3603:bd11/09/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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


** Tags: amd64 apport-bug artful

** Attachment added: "Kernel log"
   https://bugs.launchpad.net/bugs/1744379/+attachment/5039732/+files/kern.log

** Description changed:

  I have experienced a full system lockup, not even SysRq+REISUB could
  reboot the system. In the kernel logs I noticed multiple
  tcp_fastretrans_alert warnings and the upstream bug
- (https://bugzilla.kernel.org/show_bug.cgi?id=60779) seems to indicate
+ (https://bugzilla.kernel.org/show_bug.cgi?id=195835) seems to indicate
  this may be the reason.
  
  In the attached kernel log, the hang happened immediately before the
  last reboot.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-25-generic 4.13.0-25.29
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Uname: Linux 4.13.0-25-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC3:  lastique   3183 F.... pulseaudio
-  /dev/snd/controlC1:  lastique   3183 F.... pulseaudio
-  /dev/snd/controlC2:  lastique   3183 F.... pulseaudio
-  /dev/snd/controlC0:  lastique   3183 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC3:  lastique   3183 F.... pulseaudio
+  /dev/snd/controlC1:  lastique   3183 F.... pulseaudio
+  /dev/snd/controlC2:  lastique   3183 F.... pulseaudio
+  /dev/snd/controlC0:  lastique   3183 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Fri Jan 19 22:26:36 2018
  InstallationDate: Installed on 2015-05-01 (993 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: System manufacturer System Product Name
  ProcFB:
-  
+ 
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-25-generic 
root=UUID=a03f1835-52f9-4409-9da7-fe45770637ae ro quiet splash nomdmonddf 
nomdmonisw
  RelatedPackageVersions:
-  linux-restricted-modules-4.13.0-25-generic N/A
-  linux-backports-modules-4.13.0-25-generic  N/A
-  linux-firmware                             1.169.1
+  linux-restricted-modules-4.13.0-25-generic N/A
+  linux-backports-modules-4.13.0-25-generic  N/A
+  linux-firmware                             1.169.1
  RfKill:
-  0: hci0: Bluetooth
-       Soft blocked: no
-       Hard blocked: no
+  0: hci0: Bluetooth
+   Soft blocked: no
+   Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2017-11-03 (76 days ago)
  dmi.bios.date: 11/09/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3603
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z68-V PRO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3603:bd11/09/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

** Description changed:

  I have experienced a full system lockup, not even SysRq+REISUB could
  reboot the system. In the kernel logs I noticed multiple
  tcp_fastretrans_alert warnings and the upstream bug
- (https://bugzilla.kernel.org/show_bug.cgi?id=195835) seems to indicate
+ (https://bugzilla.kernel.org/show_bug.cgi?id=195835,
+ https://bugzilla.kernel.org/show_bug.cgi?id=60779) seems to indicate
  this may be the reason.
  
  In the attached kernel log, the hang happened immediately before the
  last reboot.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-25-generic 4.13.0-25.29
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Uname: Linux 4.13.0-25-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC3:  lastique   3183 F.... pulseaudio
   /dev/snd/controlC1:  lastique   3183 F.... pulseaudio
   /dev/snd/controlC2:  lastique   3183 F.... pulseaudio
   /dev/snd/controlC0:  lastique   3183 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Fri Jan 19 22:26:36 2018
  InstallationDate: Installed on 2015-05-01 (993 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: System manufacturer System Product Name
  ProcFB:
  
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-25-generic 
root=UUID=a03f1835-52f9-4409-9da7-fe45770637ae ro quiet splash nomdmonddf 
nomdmonisw
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-25-generic N/A
   linux-backports-modules-4.13.0-25-generic  N/A
   linux-firmware                             1.169.1
  RfKill:
   0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2017-11-03 (76 days ago)
  dmi.bios.date: 11/09/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3603
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z68-V PRO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3603:bd11/09/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

-- 
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https://bugs.launchpad.net/bugs/1744379

Title:
  tcp_fastretrans_alert kernel warnings, possible system hardlock

Status in linux package in Ubuntu:
  New

Bug description:
  I have experienced a full system lockup, not even SysRq+REISUB could
  reboot the system. In the kernel logs I noticed multiple
  tcp_fastretrans_alert warnings and the upstream bug
  (https://bugzilla.kernel.org/show_bug.cgi?id=195835,
  https://bugzilla.kernel.org/show_bug.cgi?id=60779) seems to indicate
  this may be the reason.

  In the attached kernel log, the hang happened immediately before the
  last reboot.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-25-generic 4.13.0-25.29
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Uname: Linux 4.13.0-25-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC3:  lastique   3183 F.... pulseaudio
   /dev/snd/controlC1:  lastique   3183 F.... pulseaudio
   /dev/snd/controlC2:  lastique   3183 F.... pulseaudio
   /dev/snd/controlC0:  lastique   3183 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Fri Jan 19 22:26:36 2018
  InstallationDate: Installed on 2015-05-01 (993 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: System manufacturer System Product Name
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-25-generic 
root=UUID=a03f1835-52f9-4409-9da7-fe45770637ae ro quiet splash nomdmonddf 
nomdmonisw
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-25-generic N/A
   linux-backports-modules-4.13.0-25-generic  N/A
   linux-firmware                             1.169.1
  RfKill:
   0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2017-11-03 (76 days ago)
  dmi.bios.date: 11/09/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3603
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z68-V PRO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3603:bd11/09/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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