Activity log for bug #1317811

Date Who What changed Old value New value Message
2014-05-09 09:26:54 Stéphan Kochen bug added bug
2014-05-09 09:30:17 Brad Figg linux (Ubuntu): status New Incomplete
2014-05-09 10:00:49 Stéphan Kochen tags amd64 apport-bug ec2-images trusty amd64 apport-bug apport-collected ec2-images trusty
2014-05-09 10:00:51 Stéphan Kochen description Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the kernel log: xen_netfront: xennet: skb rides the rocket: 19 slots Each of these messages corresponds to a dropped TX packet, and eventually causes our application's connections to break and timeout. The problem appears when network load increases. We have Node.js processes doing pubsub with a Redis server, and these are most visibly affected, showing frequent connection loss. The processes talk to each other using the private addresses EC2 allocates to the machines. Notably, the default MTU on the network interface seems to have gone up from 1500 on 13.10, to 9000 in 14.04 LTS. Reducing the MTU back to 1500 seems to drastically reduce dropped packets. (Can't say for certain if it completely eliminates the problem.) The machines we run are started from ami-896c96fe. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 May 9 09:01 seq crw-rw---- 1 root audio 116, 33 May 9 09:01 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Fri May 9 09:11:18 2014 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the kernel log: xen_netfront: xennet: skb rides the rocket: 19 slots Each of these messages corresponds to a dropped TX packet, and eventually causes our application's connections to break and timeout. The problem appears when network load increases. We have Node.js processes doing pubsub with a Redis server, and these are most visibly affected, showing frequent connection loss. The processes talk to each other using the private addresses EC2 allocates to the machines. Notably, the default MTU on the network interface seems to have gone up from 1500 on 13.10, to 9000 in 14.04 LTS. Reducing the MTU back to 1500 seems to drastically reduce dropped packets. (Can't say for certain if it completely eliminates the problem.) The machines we run are started from ami-896c96fe. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 May 9 09:01 seq crw-rw---- 1 root audio 116, 33 May 9 09:01 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Fri May 9 09:11:18 2014 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) --- AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 May 9 09:54 seq crw-rw---- 1 root audio 116, 33 May 9 09:54 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory CurrentDmesg: [ 24.724129] init: plymouth-upstart-bridge main process ended, respawning DistroRelease: Ubuntu 14.04 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 Package: linux (not installed) PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory Tags: trusty ec2-images Uname: Linux 3.13.0-24-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video _MarkForUpload: True
2014-05-09 10:00:52 Stéphan Kochen attachment added BootDmesg.txt https://bugs.launchpad.net/bugs/1317811/+attachment/4108532/+files/BootDmesg.txt
2014-05-09 10:00:54 Stéphan Kochen attachment added ProcCpuinfo.txt https://bugs.launchpad.net/bugs/1317811/+attachment/4108533/+files/ProcCpuinfo.txt
2014-05-09 10:00:58 Stéphan Kochen attachment added ProcEnviron.txt https://bugs.launchpad.net/bugs/1317811/+attachment/4108534/+files/ProcEnviron.txt
2014-05-09 10:00:59 Stéphan Kochen attachment added ProcInterrupts.txt https://bugs.launchpad.net/bugs/1317811/+attachment/4108535/+files/ProcInterrupts.txt
2014-05-09 10:01:02 Stéphan Kochen attachment added ProcModules.txt https://bugs.launchpad.net/bugs/1317811/+attachment/4108536/+files/ProcModules.txt
2014-05-09 10:01:03 Stéphan Kochen attachment added UdevDb.txt https://bugs.launchpad.net/bugs/1317811/+attachment/4108537/+files/UdevDb.txt
2014-05-09 10:01:05 Stéphan Kochen attachment added UdevLog.txt https://bugs.launchpad.net/bugs/1317811/+attachment/4108538/+files/UdevLog.txt
2014-05-09 10:01:07 Stéphan Kochen attachment added WifiSyslog.txt https://bugs.launchpad.net/bugs/1317811/+attachment/4108539/+files/WifiSyslog.txt
2014-05-09 10:02:33 Stéphan Kochen linux (Ubuntu): status Incomplete Confirmed
2014-05-09 18:26:31 Joseph Salisbury linux (Ubuntu): importance Undecided Medium
2014-05-13 10:22:04 Stefan Bader bug added subscriber Stefan Bader
2014-05-13 16:05:29 Stefan Bader linux (Ubuntu): status Confirmed In Progress
2014-05-13 16:05:29 Stefan Bader linux (Ubuntu): assignee Stefan Bader (smb)
2014-05-14 16:53:10 Stefano Rivera bug added subscriber Yola
2014-07-02 15:53:08 Patrick Hemmer bug added subscriber Patrick Hemmer
2014-08-20 14:55:33 Jon Schewe bug added subscriber Jon Schewe
2014-09-09 11:39:50 Pablo bug added subscriber Pablo
2014-10-02 08:46:47 Anders Bruun Olsen bug added subscriber Anders Bruun Olsen
2014-11-13 21:19:21 Jared Biel bug added subscriber Jared Biel
2014-11-24 18:50:50 Dylan McCall bug added subscriber Dylan McCall
2014-12-01 03:36:33 Carl Hörberg bug added subscriber Carl Hörberg
2014-12-01 09:50:06 Stefan Bader nominated for series Ubuntu Utopic
2014-12-01 09:50:06 Stefan Bader bug task added linux (Ubuntu Utopic)
2014-12-01 09:50:06 Stefan Bader nominated for series Ubuntu Trusty
2014-12-01 09:50:06 Stefan Bader bug task added linux (Ubuntu Trusty)
2014-12-01 09:50:22 Stefan Bader linux (Ubuntu Trusty): importance Undecided Medium
2014-12-01 09:50:22 Stefan Bader linux (Ubuntu Trusty): status New Triaged
2014-12-01 09:50:34 Stefan Bader linux (Ubuntu Utopic): importance Undecided Medium
2014-12-01 09:50:34 Stefan Bader linux (Ubuntu Utopic): status New Triaged
2014-12-01 09:55:20 Stefan Bader description Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the kernel log: xen_netfront: xennet: skb rides the rocket: 19 slots Each of these messages corresponds to a dropped TX packet, and eventually causes our application's connections to break and timeout. The problem appears when network load increases. We have Node.js processes doing pubsub with a Redis server, and these are most visibly affected, showing frequent connection loss. The processes talk to each other using the private addresses EC2 allocates to the machines. Notably, the default MTU on the network interface seems to have gone up from 1500 on 13.10, to 9000 in 14.04 LTS. Reducing the MTU back to 1500 seems to drastically reduce dropped packets. (Can't say for certain if it completely eliminates the problem.) The machines we run are started from ami-896c96fe. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 May 9 09:01 seq crw-rw---- 1 root audio 116, 33 May 9 09:01 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Fri May 9 09:11:18 2014 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) --- AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 May 9 09:54 seq crw-rw---- 1 root audio 116, 33 May 9 09:54 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory CurrentDmesg: [ 24.724129] init: plymouth-upstart-bridge main process ended, respawning DistroRelease: Ubuntu 14.04 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 Package: linux (not installed) PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory Tags: trusty ec2-images Uname: Linux 3.13.0-24-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video _MarkForUpload: True Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the kernel log:     xen_netfront: xennet: skb rides the rocket: 19 slots Each of these messages corresponds to a dropped TX packet, and eventually causes our application's connections to break and timeout. The problem appears when network load increases. We have Node.js processes doing pubsub with a Redis server, and these are most visibly affected, showing frequent connection loss. The processes talk to each other using the private addresses EC2 allocates to the machines. Notably, the default MTU on the network interface seems to have gone up from 1500 on 13.10, to 9000 in 14.04 LTS. Reducing the MTU back to 1500 seems to drastically reduce dropped packets. (Can't say for certain if it completely eliminates the problem.) The machines we run are started from ami-896c96fe. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 AlsaDevices:  total 0  crw-rw---- 1 root audio 116, 1 May 9 09:01 seq  crw-rw---- 1 root audio 116, 33 May 9 09:01 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Fri May 9 09:11:18 2014 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 RelatedPackageVersions:  linux-restricted-modules-3.13.0-24-generic N/A  linux-backports-modules-3.13.0-24-generic N/A  linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) --- AlsaDevices:  total 0  crw-rw---- 1 root audio 116, 1 May 9 09:54 seq  crw-rw---- 1 root audio 116, 33 May 9 09:54 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory CurrentDmesg: [ 24.724129] init: plymouth-upstart-bridge main process ended, respawning DistroRelease: Ubuntu 14.04 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 Package: linux (not installed) PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 RelatedPackageVersions:  linux-restricted-modules-3.13.0-24-generic N/A  linux-backports-modules-3.13.0-24-generic N/A  linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory Tags: trusty ec2-images Uname: Linux 3.13.0-24-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video _MarkForUpload: True break-fix: - 97a6d1bb2b658ac85ed88205ccd1ab809899884d
2014-12-01 09:55:48 Stefan Bader tags amd64 apport-bug apport-collected ec2-images trusty amd64 apport-bug apport-collected ec2-images kernel-bug-break-fix trusty
2014-12-04 22:55:08 Andy Whitcroft linux (Ubuntu Trusty): status Triaged Confirmed
2014-12-04 22:55:17 Andy Whitcroft linux (Ubuntu Utopic): status Triaged Confirmed
2014-12-04 22:55:22 Andy Whitcroft linux (Ubuntu): status In Progress Fix Committed
2014-12-08 22:52:19 KyleAnderson bug added subscriber KyleAnderson
2014-12-18 07:03:08 Zivago Lee bug added subscriber Zivago Lee
2015-01-07 09:16:55 Andy Whitcroft linux (Ubuntu): status Fix Committed Fix Released
2015-01-16 02:37:33 Diego Rodriguez bug added subscriber Diego Rodriguez
2015-01-16 13:01:41 Stefan Bader description Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the kernel log:     xen_netfront: xennet: skb rides the rocket: 19 slots Each of these messages corresponds to a dropped TX packet, and eventually causes our application's connections to break and timeout. The problem appears when network load increases. We have Node.js processes doing pubsub with a Redis server, and these are most visibly affected, showing frequent connection loss. The processes talk to each other using the private addresses EC2 allocates to the machines. Notably, the default MTU on the network interface seems to have gone up from 1500 on 13.10, to 9000 in 14.04 LTS. Reducing the MTU back to 1500 seems to drastically reduce dropped packets. (Can't say for certain if it completely eliminates the problem.) The machines we run are started from ami-896c96fe. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 AlsaDevices:  total 0  crw-rw---- 1 root audio 116, 1 May 9 09:01 seq  crw-rw---- 1 root audio 116, 33 May 9 09:01 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Fri May 9 09:11:18 2014 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 RelatedPackageVersions:  linux-restricted-modules-3.13.0-24-generic N/A  linux-backports-modules-3.13.0-24-generic N/A  linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) --- AlsaDevices:  total 0  crw-rw---- 1 root audio 116, 1 May 9 09:54 seq  crw-rw---- 1 root audio 116, 33 May 9 09:54 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory CurrentDmesg: [ 24.724129] init: plymouth-upstart-bridge main process ended, respawning DistroRelease: Ubuntu 14.04 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 Package: linux (not installed) PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 RelatedPackageVersions:  linux-restricted-modules-3.13.0-24-generic N/A  linux-backports-modules-3.13.0-24-generic N/A  linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory Tags: trusty ec2-images Uname: Linux 3.13.0-24-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video _MarkForUpload: True break-fix: - 97a6d1bb2b658ac85ed88205ccd1ab809899884d Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the kernel log:     xen_netfront: xennet: skb rides the rocket: 19 slots Each of these messages corresponds to a dropped TX packet, and eventually causes our application's connections to break and timeout. The problem appears when network load increases. We have Node.js processes doing pubsub with a Redis server, and these are most visibly affected, showing frequent connection loss. The processes talk to each other using the private addresses EC2 allocates to the machines. Notably, the default MTU on the network interface seems to have gone up from 1500 on 13.10, to 9000 in 14.04 LTS. Reducing the MTU back to 1500 seems to drastically reduce dropped packets. (Can't say for certain if it completely eliminates the problem.) The machines we run are started from ami-896c96fe. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 AlsaDevices:  total 0  crw-rw---- 1 root audio 116, 1 May 9 09:01 seq  crw-rw---- 1 root audio 116, 33 May 9 09:01 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Fri May 9 09:11:18 2014 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 RelatedPackageVersions:  linux-restricted-modules-3.13.0-24-generic N/A  linux-backports-modules-3.13.0-24-generic N/A  linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) --- AlsaDevices:  total 0  crw-rw---- 1 root audio 116, 1 May 9 09:54 seq  crw-rw---- 1 root audio 116, 33 May 9 09:54 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory CurrentDmesg: [ 24.724129] init: plymouth-upstart-bridge main process ended, respawning DistroRelease: Ubuntu 14.04 Ec2AMI: ami-896c96fe Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: c3.large Ec2Kernel: aki-52a34525 Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99 Package: linux (not installed) PciMultimedia: ProcFB: ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0 ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9 RelatedPackageVersions:  linux-restricted-modules-3.13.0-24-generic N/A  linux-backports-modules-3.13.0-24-generic N/A  linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory Tags: trusty ec2-images Uname: Linux 3.13.0-24-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video _MarkForUpload: True break-fix: - 97a6d1bb2b658ac85ed88205ccd1ab809899884d break-fix: - 11d3d2a16cc1f05c6ece69a4392e99efb85666a6
2015-01-27 15:04:57 Hector bug added subscriber Hector
2015-01-31 16:24:16 Giacomo Tazzari bug added subscriber Giacomo
2015-02-03 10:18:14 oLi bug added subscriber oLi
2015-02-04 23:51:14 Durzo bug added subscriber Durzo
2015-02-09 10:09:09 Andy Whitcroft linux (Ubuntu Utopic): status Confirmed Fix Committed
2015-02-09 12:26:20 Heikki Hannikainen bug added subscriber Heikki Hannikainen
2015-02-09 17:01:44 David Terei bug added subscriber David Terei
2015-02-09 20:22:38 Seth Forshee linux (Ubuntu Trusty): status Confirmed Fix Committed
2015-02-13 17:19:56 Brad Figg tags amd64 apport-bug apport-collected ec2-images kernel-bug-break-fix trusty amd64 apport-bug apport-collected ec2-images kernel-bug-break-fix trusty verification-needed-trusty
2015-02-17 22:46:18 Patrick Domack bug added subscriber Patrick Domack
2015-02-18 08:37:45 Stefan Bader tags amd64 apport-bug apport-collected ec2-images kernel-bug-break-fix trusty verification-needed-trusty amd64 apport-bug apport-collected ec2-images kernel-bug-break-fix trusty verification-done-trusty
2015-02-18 08:38:58 Stefan Bader tags amd64 apport-bug apport-collected ec2-images kernel-bug-break-fix trusty verification-done-trusty amd64 apport-bug apport-collected ec2-images kernel-bug-break-fix trusty verification-done-trusty verification-done-utopic
2015-02-18 08:39:24 Stefan Bader linux (Ubuntu): assignee Stefan Bader (smb)
2015-02-24 17:49:43 Bartosz Cisek bug added subscriber Bartosz Cisek
2015-02-24 19:58:45 Launchpad Janitor linux (Ubuntu Trusty): status Fix Committed Fix Released
2015-02-24 19:58:45 Launchpad Janitor cve linked 2015-0239
2015-02-24 19:58:46 Launchpad Janitor linux (Ubuntu Trusty): status Fix Committed Fix Released
2015-02-26 00:53:07 David M. Lee bug added subscriber David M. Lee
2015-03-03 15:16:42 Andy Whitcroft linux (Ubuntu Utopic): status Fix Committed Fix Released
2015-03-03 15:16:46 Andy Whitcroft tags amd64 apport-bug apport-collected ec2-images kernel-bug-break-fix trusty verification-done-trusty verification-done-utopic amd64 apport-bug apport-collected ec2-images trusty verification-done-trusty verification-done-utopic