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[Bug 906159] Re: GPF in ksmd cmp_and_merge_page flow

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Shyam, this bug was reported a while ago and there hasn't been any
activity in it recently. We were wondering if this is still an issue in
Precise+? If so, could you please run the following command from a
Terminal (Applications->Accessories->Terminal), as it will automatically
gather and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

** Tags added: bios-outdated-1.12.0

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

** Changed in: linux (Ubuntu)
     Assignee: Chris J Arges (arges) => (unassigned)

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https://bugs.launchpad.net/bugs/906159

Title:
  GPF in ksmd cmp_and_merge_page flow

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  We hit upon this GPF in oneiric 3.0.0-14-server kernel. Just before
  the upgrade to oneiric we were running natty (2.6.38-8-server) & we
  never hit this one.

  Dec 16 21:23:18 ccslave kernel: [178781.743302] general protection fault: 0000 [#1] SMP
  Dec 16 21:23:18 ccslave kernel: [178781.744129] CPU 5
  Dec 16 21:23:18 ccslave kernel: [178781.744442] Modules linked in: pci_stub ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm drbd lru_cache vesafb ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core nfsd ib_addr nfs scst_vdisk iscsi_tcp libiscsi_tcp iscsi_scst libiscsi scsi_transport_iscsi lockd scst fscache auth_rpcgss nfs_acl sunrpc libcrc32c dm_iostat bridge stp joydev usbhid psmouse hid serio_raw i7core_edac edac_core ghes dm_multipath acpi_power_meter hed dcdbas lp parport ses enclosure ixgbevf ixgbe dca megaraid_sas bnx2 mdio
  Dec 16 21:23:18 ccslave kernel: [178781.754220]
  Dec 16 21:23:18 ccslave kernel: [178781.754445] Pid: 93, comm: ksmd Not tainted 3.0.0-14-server #23-Ubuntu Dell Inc. PowerEdge R510/0DPRKF
  Dec 16 21:23:18 ccslave kernel: [178781.755968] RIP: 0010:[<ffffffff8114e7a7>]  [<ffffffff8114e7a7>] unstable_tree_search_insert+0x37/0x150
  Dec 16 21:23:18 ccslave kernel: [178781.757386] RSP: 0018:ffff88061a857df0  EFLAGS: 00010246
  Dec 16 21:23:18 ccslave kernel: [178781.758201] RAX: 000088057dfc50a8 RBX: ffffea0004205fe0 RCX: 0000000000000009
  Dec 16 21:23:18 ccslave kernel: [178781.759344] RDX: ffff88061a857fd8 RSI: ffff8802ffac6000 RDI: ffffea000a7edb50
  Dec 16 21:23:18 ccslave kernel: [178781.760432] RBP: ffff88061a857e30 R08: 00000000000000c2 R09: 00000000fffffffe
  Dec 16 21:23:18 ccslave kernel: [178781.761323] R10: ffff88012dd24000 R11: 0000000000000001 R12: ffff880577acd080
  Dec 16 21:23:18 ccslave kernel: [178781.762223] R13: ffffea000a7edb50 R14: ffff880315043ff8 R15: ffff880315043fc0
  Dec 16 21:23:18 ccslave kernel: [178781.763228] FS:  0000000000000000(0000) GS:ffff88032fc40000(0000) knlGS:0000000000000000
  Dec 16 21:23:18 ccslave kernel: [178781.764458] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  Dec 16 21:23:18 ccslave kernel: [178781.765305] CR2: 00007f1acad28000 CR3: 0000000001c03000 CR4: 00000000000026e0
  Dec 16 21:23:18 ccslave kernel: [178781.766427] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  Dec 16 21:23:18 ccslave kernel: [178781.767534] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  Dec 16 21:23:18 ccslave kernel: [178781.768659] Process ksmd (pid: 93, threadinfo ffff88061a856000, task ffff88061c729720)
  Dec 16 21:23:18 ccslave kernel: [178781.769937] Stack:
  Dec 16 21:23:18 ccslave kernel: [178781.770108]  ffff880315043fe8 ffff88061a857e48 ffff88061a857e30 ffffea001359fb18
  Dec 16 21:23:18 ccslave kernel: [178781.770545]  ffffea0004205fe0 ffff880577acd080 0000000000000000 ffff88061c729720
  Dec 16 21:23:18 ccslave kernel: [178781.771483]  ffff88061a857e70 ffffffff8114f690 0000000000000001 0000000000000000
  Dec 16 21:23:18 ccslave kernel: [178781.772667] Call Trace:
  Dec 16 21:23:18 ccslave kernel: [178781.773046]  [<ffffffff8114f690>] cmp_and_merge_page+0x160/0x260
  Dec 16 21:23:18 ccslave kernel: [178781.773964]  [<ffffffff8114f83f>] ksm_scan_thread+0xaf/0x2a0
  Dec 16 21:23:18 ccslave kernel: [178781.774839]  [<ffffffff81081660>] ? add_wait_queue+0x60/0x60
  Dec 16 21:23:18 ccslave kernel: [178781.775698]  [<ffffffff8114f790>] ? cmp_and_merge_page+0x260/0x260
  Dec 16 21:23:18 ccslave kernel: [178781.776651]  [<ffffffff81080bbc>] kthread+0x8c/0xa0
  Dec 16 21:23:18 ccslave kernel: [178781.817247]  [<ffffffff81609164>] kernel_thread_helper+0x4/0x10
  Dec 16 21:23:18 ccslave kernel: [178781.817252]  [<ffffffff81080b30>] ? flush_kthread_worker+0xa0/0xa0
  Dec 16 21:23:18 ccslave kernel: [178781.817257]  [<ffffffff81609160>] ? gs_change+0x13/0x13
  Dec 16 21:23:18 ccslave kernel: [178781.817260] Code: 53 48 83 ec 18 66 66 66 66 90 49 c7 c6 40 98 ee 81 48 89 55 c8 49 89 fc 48 89 f3 31 d2 49 83 3e 00 74 71 e8 fc f5 4a 00 49 8b 06
  Dec 16 21:23:18 ccslave kernel: [178781.817282] RIP  [<ffffffff8114e7a7>] unstable_tree_search_insert+0x37/0x150
  Dec 16 21:23:18 ccslave kernel: [178781.817287]  RSP <ffff88061a857df0>
  Dec 16 21:23:18 ccslave kernel: [178782.070994] ---[ end trace ce317bb6c729a57b ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-14-server 3.0.0-14.23
  ProcVersionSignature: Ubuntu 3.0.0-14.23-server 3.0.9
  Uname: Linux 3.0.0-14-server x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 2011-12-19 06:30 seq
   crw-rw---- 1 root audio 116, 33 2011-12-19 06:30 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 1.23-0ubuntu4
  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
  Date: Mon Dec 19 06:49:20 2011
  HibernationDevice: RESUME=UUID=a2f4cf63-69ef-4c37-8fdf-6d6919274aae
  InstallationMedia: Ubuntu-Server 11.04 "Natty Narwhal" - Release amd64 (20110426)
  MachineType: Dell Inc. PowerEdge R510
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-14-server root=UUID=a343c1c4-8b09-4f66-9ba4-838f6b60e7e7 ro quiet intel_iommu=on ixgbe.max_vfs=10
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-14-server N/A
   linux-backports-modules-3.0.0-14-server  N/A
   linux-firmware                           1.60
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux
  UpgradeStatus: Upgraded to oneiric on 2011-12-12 (6 days ago)
  dmi.bios.date: 10/25/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.5.3
  dmi.board.name: 0DPRKF
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.5.3:bd10/25/2010:svnDellInc.:pnPowerEdgeR510:pvr:rvnDellInc.:rn0DPRKF:rvrA03:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R510
  dmi.sys.vendor: Dell Inc.

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