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[Sam Lade <1518457@xxxxxxxxxxxxxxxxxx>]

It's crashing on boot with this version. It's related to paging, so it
might be relevant to the issue, so I've attached the full dmesg and
here's the actual crash:

[    3.716345] BUG: unable to handle kernel paging request at 000060ffc0002370
[    3.720056] IP: [<ffffffff811a6ae1>] mem_cgroup_move_account+0xd1/0x250
[    3.720056] PGD 0 
[    3.720056] Oops: 0000 [#1] SMP 
[    3.720056] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_recent xt_conntrack nf_conntrack iptable_filter ip_tables x_tables autofs4 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse floppy pata_acpi
[    3.720056] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 3.12.0-031200rc2-generic #201512161751
[    3.720056] Hardware name: Xen HVM domU, BIOS 4.2.amazon 12/07/2015
[    3.720056] Workqueue: events css_killed_work_fn
[    3.720056] task: ffff88003da946b0 ti: ffff88003daac000 task.ti: ffff88003daac000
[    3.720056] RIP: 0010:[<ffffffff811a6ae1>]  [<ffffffff811a6ae1>] mem_cgroup_move_account+0xd1/0x250
[    3.720056] RSP: 0000:ffff88003daadcc8  EFLAGS: 00010046
[    3.720056] RAX: 0000000000000246 RBX: ffff88003d803a60 RCX: 000000000000053e
[    3.720056] RDX: 000060ffc0002358 RSI: 0000000000000001 RDI: ffff88003c4e822c
[    3.720056] RBP: ffff88003daadd20 R08: ffff88003cc55000 R09: 0000000000000004
[    3.720056] R10: ffff88003c4e8000 R11: 0000000000000001 R12: 0000000000000000
[    3.720056] R13: ffffea0000e0e980 R14: ffff88003c4e8000 R15: 0000000000000001
[    3.720056] FS:  0000000000000000(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
[    3.720056] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.720056] CR2: 000060ffc0002370 CR3: 0000000036754000 CR4: 00000000001406f0
[    3.720056] Stack:
[    3.720056]  ffffffff811a7bc8 ffff88003fffb780 ffffea0000e0e980 ffff88003cc55000
[    3.720056]  ffff88003c4e8000 ffff88003c4e822c ffff880036c1da00 ffffea0000e0e980
[    3.720056]  ffff88003fffbcc0 ffff88003d803a60 ffffea0000e0e9a0 ffff88003daadda8
[    3.720056] Call Trace:
[    3.720056]  [<ffffffff811a7bc8>] ? mem_cgroup_page_lruvec+0x28/0x90
[    3.720056]  [<ffffffff811a8427>] mem_cgroup_reparent_charges+0x257/0x460
[    3.720056]  [<ffffffff811a87df>] mem_cgroup_css_offline+0xaf/0x220
[    3.720056]  [<ffffffff810de897>] offline_css+0x27/0x50
[    3.720056]  [<ffffffff810e199d>] css_killed_work_fn+0x2d/0xa0
[    3.720056]  [<ffffffff81081032>] process_one_work+0x182/0x450
[    3.720056]  [<ffffffff81081dc1>] worker_thread+0x121/0x410
[    3.720056]  [<ffffffff81081ca0>] ? rescuer_thread+0x3d0/0x3d0
[    3.720056]  [<ffffffff81088ba0>] kthread+0xc0/0xd0
[    3.720056]  [<ffffffff81088ae0>] ? kthread_create_on_node+0x120/0x120
[    3.720056]  [<ffffffff816ff4fc>] ret_from_fork+0x7c/0xb0
[    3.720056]  [<ffffffff81088ae0>] ? kthread_create_on_node+0x120/0x120
[    3.720056] Code: d6 00 55 00 4d 85 e4 4c 8b 55 c8 4c 8b 45 c0 0f 85 a5 00 00 00 41 8b 55 18 85 d2 0f 88 99 00 00 00 49 8b 96 30 02 00 00 45 89 fb <4c> 39 5a 18 0f 8c c2 00 00 00 44 89 f9 f7 d9 89 ce 65 48 01 72 
[    3.720056] RIP  [<ffffffff811a6ae1>] mem_cgroup_move_account+0xd1/0x250
[    3.720056]  RSP <ffff88003daadcc8>
[    3.720056] CR2: 000060ffc0002370
[    3.720056] ---[ end trace 9ea086b6da9e6208 ]---

** Attachment added: "kswapd0-kernel-oops.txt"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1518457/+attachment/4535981/+files/kswapd0-kernel-oops.txt

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https://bugs.launchpad.net/bugs/1518457

Title:
  kswapd0 100% CPU usage

Status in linux package in Ubuntu:
  In Progress

Bug description:
  As per bug 721896 and various others:

  I'm on an AWS t2.micro instance (Xeon E5-2670, 991MiB of memory).
  Occasionally (about once a day), kswapd0 falls into a busy loop and
  spins on 100% CPU usage indefinitely. This can be provoked by
  copying/writing large files (e.g. dding a 256MB file), but it happens
  occasionally otherwise. System memory usage (not including
  buffers/caches) currently sits at 36%, which is typical[1]. Initially
  I had no swap space configured; I've since tried enabling a 256MB swap
  file, but the problem continues to occur and no swap space is used.
  The system can be recovered with `echo 1 > /proc/sys/vm/drop_caches`.

  Happy to provide further information/take further debugging actions.

  
  [1] Full output from `free`:
               total       used       free     shared    buffers     cached
  Mem:       1014936     483448     531488      28556       9756     112700
  -/+ buffers/cache:     360992     653944
  Swap:       262140          0     262140

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-18-generic 4.2.0-18.22
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Nov 19 19:40 seq
   crw-rw---- 1 root audio 116, 33 Nov 19 19:40 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.19.1-0ubuntu5
  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: N/A
  Date: Fri Nov 20 20:44:30 2015
  Ec2AMI: ami-1c552a76
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: us-east-1d
  Ec2InstanceType: t2.micro
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  MachineType: Xen HVM domU
  PciMultimedia:
   
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 xen
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=35bc01f4-4602-4823-976e-508edef899df ro console=tty1 console=ttyS0 net.ifnames=0
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-18-generic N/A
   linux-backports-modules-4.2.0-18-generic  N/A
   linux-firmware                            N/A
  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)
  dmi.bios.date: 05/06/2015
  dmi.bios.vendor: Xen
  dmi.bios.version: 4.2.amazon
  dmi.chassis.type: 1
  dmi.chassis.vendor: Xen
  dmi.modalias: dmi:bvnXen:bvr4.2.amazon:bd05/06/2015:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr:
  dmi.product.name: HVM domU
  dmi.product.version: 4.2.amazon
  dmi.sys.vendor: Xen

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