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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

Public bug reported:

I created an 8 CPU arm64 instance on Canonical's Scalingstack (which I
want to use for armhf autopkgtesting in LXD). I started with wily as
that has lxd available (it's not yet available in trusty nor the PPA for
arm64).

However, pretty much any LXD task that I do (I haven't tried much else)
on this machine takes unbearably long. A simple "lxc profile set default
raw.lxc lxc.seccomp=" or "lxc list" takes several minutes.

I see tons of

[ 1020.971955] rcu_sched kthread starved for 6000 jiffies! g1095 c1094 f0x0
[ 1121.166926] INFO: task fsnotify_mark:69 blocked for more than 120 seconds.

in dmesg (the attached apport info has the complete dmesg).

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-22-generic 4.2.0-22.27
ProcVersionSignature: User Name 4.2.0-22.27-generic 4.2.6
Uname: Linux 4.2.0-22-generic aarch64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 Jan  7 09:18 seq
 crw-rw---- 1 root audio 116, 33 Jan  7 09:18 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.19.1-0ubuntu5
Architecture: arm64
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: N/A
Date: Thu Jan  7 09:24:01 2016
IwConfig:
 eth0      no wireless extensions.

 lo        no wireless extensions.

 lxcbr0    no wireless extensions.
Lspci:
 00:00.0 Host bridge [0600]: Red Hat, Inc. Device [1b36:0008]
  Subsystem: Red Hat, Inc Device [1af4:1100]
  Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
  Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
PciMultimedia:

ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=LABEL=cloudimg-rootfs earlyprintk
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-22-generic N/A
 linux-backports-modules-4.2.0-22-generic  N/A
 linux-firmware                            1.149.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: apport-bug arm64 uec-images wily

** Description changed:

  I created an 8 CPU arm64 instance on Canonical's Scalingstack (which I
  want to use for armhf autopkgtesting in LXD). I started with wily as
  that has lxd available (it's not yet available in trusty nor the PPA for
  arm64).
  
- However, pretty much anything that I do on this machine takes unbearably
- long. A simple "lxc profile set default raw.lxc lxc.seccomp=" or "lxc
- list" takes several minutes.
+ However, pretty much any LXD task that I do (I haven't tried much else)
+ on this machine takes unbearably long. A simple "lxc profile set default
+ raw.lxc lxc.seccomp=" or "lxc list" takes several minutes.
  
  I see tons of
  
  [ 1020.971955] rcu_sched kthread starved for 6000 jiffies! g1095 c1094 f0x0
  [ 1121.166926] INFO: task fsnotify_mark:69 blocked for more than 120 seconds.
  
  in dmesg (the attached apport info has the complete dmesg).
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-22-generic 4.2.0-22.27
  ProcVersionSignature: User Name 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic aarch64
  AlsaDevices:
-  total 0
-  crw-rw---- 1 root audio 116,  1 Jan  7 09:18 seq
-  crw-rw---- 1 root audio 116, 33 Jan  7 09:18 timer
+  total 0
+  crw-rw---- 1 root audio 116,  1 Jan  7 09:18 seq
+  crw-rw---- 1 root audio 116, 33 Jan  7 09:18 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: arm64
  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: N/A
  Date: Thu Jan  7 09:24:01 2016
  IwConfig:
-  eth0      no wireless extensions.
-  
-  lo        no wireless extensions.
-  
-  lxcbr0    no wireless extensions.
+  eth0      no wireless extensions.
+ 
+  lo        no wireless extensions.
+ 
+  lxcbr0    no wireless extensions.
  Lspci:
-  00:00.0 Host bridge [0600]: Red Hat, Inc. Device [1b36:0008]
-  	Subsystem: Red Hat, Inc Device [1af4:1100]
-  	Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
-  	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
+  00:00.0 Host bridge [0600]: Red Hat, Inc. Device [1b36:0008]
+   Subsystem: Red Hat, Inc Device [1af4:1100]
+   Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
+   Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  PciMultimedia:
-  
+ 
  ProcEnviron:
-  TERM=screen
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=screen
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB:
-  
+ 
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=LABEL=cloudimg-rootfs earlyprintk
  RelatedPackageVersions:
-  linux-restricted-modules-4.2.0-22-generic N/A
-  linux-backports-modules-4.2.0-22-generic  N/A
-  linux-firmware                            1.149.3
+  linux-restricted-modules-4.2.0-22-generic N/A
+  linux-backports-modules-4.2.0-22-generic  N/A
+  linux-firmware                            1.149.3
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1531768

Title:
  kernel 4.2/wily on arm64 and multiple CPUs is unusably slow

Status in linux package in Ubuntu:
  New

Bug description:
  I created an 8 CPU arm64 instance on Canonical's Scalingstack (which I
  want to use for armhf autopkgtesting in LXD). I started with wily as
  that has lxd available (it's not yet available in trusty nor the PPA
  for arm64).

  However, pretty much any LXD task that I do (I haven't tried much
  else) on this machine takes unbearably long. A simple "lxc profile set
  default raw.lxc lxc.seccomp=" or "lxc list" takes several minutes.

  I see tons of

  [ 1020.971955] rcu_sched kthread starved for 6000 jiffies! g1095 c1094 f0x0
  [ 1121.166926] INFO: task fsnotify_mark:69 blocked for more than 120 seconds.

  in dmesg (the attached apport info has the complete dmesg).

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-22-generic 4.2.0-22.27
  ProcVersionSignature: User Name 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic aarch64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jan  7 09:18 seq
   crw-rw---- 1 root audio 116, 33 Jan  7 09:18 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: arm64
  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: N/A
  Date: Thu Jan  7 09:24:01 2016
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.

   lxcbr0    no wireless extensions.
  Lspci:
   00:00.0 Host bridge [0600]: Red Hat, Inc. Device [1b36:0008]
    Subsystem: Red Hat, Inc Device [1af4:1100]
    Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  PciMultimedia:

  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=LABEL=cloudimg-rootfs earlyprintk
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-22-generic N/A
   linux-backports-modules-4.2.0-22-generic  N/A
   linux-firmware                            1.149.3
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)

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