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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Utopic)
   Importance: Medium
       Status: Confirmed

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: linux (Ubuntu Trusty)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Utopic)
       Status: Confirmed => In Progress

** Changed in: linux (Ubuntu Utopic)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Utopic)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1323165

Title:
  [HP ProLiant DL380p Gen8] kernel BUG at
  /build/buildd/linux-3.13.0/mm/memory.c:3756!

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux” source package in Trusty:
  In Progress
Status in “linux” source package in Utopic:
  Fix Committed

Bug description:
  The machine becomes non-responsive, unable to ssh, high load average, trying to access the running java process does not work as per syslog:
  May 26 06:19:38 server06 kernel: [75831.929529] ------------[ cut here ]------------
  May 26 06:19:38 server06 kernel: [75831.930191] kernel BUG at /build/buildd/linux-3.13.0/mm/memory.c:3756!
  May 26 06:19:38 server06 kernel: [75831.931129] invalid opcode: 0000 [#1] SMP
  May 26 06:19:38 server06 kernel: [75831.931729] Modules linked in: xt_multiport ip6t_REJECT xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables gpio_ich nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw sb_edac edac_core lpc_ich hpwdt hpilo ioatdma lp dca ipmi_si parport acpi_power_meter mac_hid tg3 ptp psmouse hpsa pps_core
  May 26 06:19:38 server06 kernel: [75831.941585] CPU: 4 PID: 2930 Comm: java Not tainted 3.13.0-24-generic #47-Ubuntu
  May 26 06:19:38 server06 kernel: [75831.942633] Hardware name: HP ProLiant DL380p Gen8, BIOS P70 02/10/2014
  May 26 06:19:38 server06 kernel: [75831.943583] task: ffff881fe8372fe0 ti: ffff881fe632a000 task.ti: ffff881fe632a000
  May 26 06:19:38 server06 kernel: [75831.944654] RIP: 0010:[<ffffffff81179051>] [<ffffffff81179051>] handle_mm_fault+0xe61/0xf10
  May 26 06:19:38 server06 kernel: [75831.946137] RSP: 0000:ffff881fe632bd98 EFLAGS: 00010246
  May 26 06:19:38 server06 kernel: [75831.946885] RAX: 0000000000000100 RBX: 00007fc37320a370 RCX: ffff881fe632bb18
  May 26 06:19:38 server06 kernel: [75831.947902] RDX: ffff881fe8372fe0 RSI: 0000000000000000 RDI: 8000000100c009e6
  May 26 06:19:38 server06 kernel: [75831.948932] RBP: ffff881fe632be20 R08: 0000000000000000 R09: 00000000000000a9
  May 26 06:19:38 server06 kernel: [75831.949952] R10: 0000000000000001 R11: 0000000000000000 R12: ffff881fd83a7cc8
  May 26 06:19:38 server06 kernel: [75831.950961] R13: ffff880fe6787d40 R14: ffff880fe5d95780 R15: 0000000000000080
  May 26 06:19:38 server06 kernel: [75831.951985] FS: 00007fc938145700(0000) GS:ffff880fffa80000(0000) knlGS:0000000000000000
  May 26 06:19:38 server06 kernel: [75831.976736] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  May 26 06:19:38 server06 kernel: [75832.005183] CR2: 00007fc373620930 CR3: 0000000fe63fe000 CR4: 00000000000407e0
  May 26 06:19:38 server06 kernel: [75832.033473] Stack:
  May 26 06:19:38 server06 kernel: [75832.060551] 0000000000000001 ffff881fe632bdb0 ffffffff8109a780 ffff881fe632bdd0
  May 26 06:19:38 server06 kernel: [75832.117385] ffffffff810d7ad6 0000000000000001 ffffffff81f1ea20 ffff881fe632be78
  May 26 06:19:38 server06 kernel: [75832.173599] ffffffff810d983d ffff881fe632be48 ffff8800000000a9 00000001ffffffff
  May 26 06:19:38 server06 kernel: [75832.231813] Call Trace:
  May 26 06:19:38 server06 kernel: [75832.258781] [<ffffffff8109a780>] ? wake_up_state+0x10/0x20
  May 26 06:19:38 server06 kernel: [75832.286702] [<ffffffff810d7ad6>] ? wake_futex+0x66/0x90
  May 26 06:19:38 server06 kernel: [75832.311849] [<ffffffff810d983d>] ? futex_wake_op+0x4ed/0x620
  May 26 06:19:38 server06 kernel: [75832.337329] [<ffffffff81721a24>] __do_page_fault+0x184/0x560
  May 26 06:19:38 server06 kernel: [75832.363061] [<ffffffff811112fc>] ? acct_account_cputime+0x1c/0x20
  May 26 06:19:38 server06 kernel: [75832.387739] [<ffffffff8109d76b>] ? account_user_time+0x8b/0xa0
  May 26 06:19:38 server06 kernel: [75832.411608] [<ffffffff8109dd84>] ? vtime_account_user+0x54/0x60
  May 26 06:19:38 server06 kernel: [75832.436126] [<ffffffff81721e1a>] do_page_fault+0x1a/0x70
  May 26 06:19:38 server06 kernel: [75832.458239] [<ffffffff8171e288>] page_fault+0x28/0x30
  May 26 06:19:38 server06 kernel: [75832.481780] Code: ff 48 89 d9 4c 89 e2 4c 89 ee 4c 89 f7 44 89 4d c8 e8 34 c1 ff ff 85 c0 0f 85 94 f5 ff ff 49 8b 3c 24 44 8b 4d c8 e9 68 f3 ff ff <0f> 0b be 8e 00 00 00 48 c7 c7 18 25 a6 81 44 89 4d c8 e8 18 e7
  May 26 06:19:38 server06 kernel: [75832.551672] RIP [<ffffffff81179051>] handle_mm_fault+0xe61/0xf10
  May 26 06:19:38 server06 kernel: [75832.574254] RSP <ffff881fe632bd98>
  May 26 06:19:38 server06 kernel: [75832.630392] ---[ end trace e41b58adf8e0d72b ]---

  With Precise, it runs with 16 threads with no problem so it would
  appear a regression.

  WORKAROUND:  Run the task with 8 threads instead of 16.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May 26 09:30 seq
   crw-rw---- 1 root audio 116, 33 May 26 09:30 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.2
  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: Mon May 26 10:27:04 2014
  HibernationDevice: RESUME=UUID=a777a6ba-8cca-4435-8869-15bd3294ee35
  InstallationDate: Installed on 2014-04-30 (25 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: HP ProLiant DL380p Gen8
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=UUID=cf3b3e5c-c6c7-4a56-b471-e1741ecbd865 ro
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127.2
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/10/2014
  dmi.bios.vendor: HP
  dmi.bios.version: P70
  dmi.chassis.type: 23
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrP70:bd02/10/2014:svnHP:pnProLiantDL380pGen8:pvr:cvnHP:ct23:cvr:
  dmi.product.name: ProLiant DL380p Gen8
  dmi.sys.vendor: HP

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