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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1499272

Title:
  General protection fault in btrfs crashes NFS server

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Under unknown circumstances, the NFS server crashes and the only solution is a server reboot. The symptom is the following trace in the kernel log file:
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014733] general protection fault: 0000 [#1] SMP 
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014739] Modules linked in: unix_diag tcp_diag inet_diag drbd lru_cache quota_v2 quota_tree bridge stp llc intel_powerclamp coretemp bnep rfcomm gpio_ich ipmi_devintf kvm_intel kvm bluetooth crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper joydev acpi_power_meter dcdbas ablk_helper cryptd serio_raw mac_hid lpc_ich wmi ipmi_si i7core_edac edac_core ioatdma shpchp nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache parport_pc ppdev bonding lp parport btrfs xor raid6_pq libcrc32c ses enclosure hid_generic ixgbe psmouse usbhid dca hid ptp pps_core bnx2 megaraid_sas mdio
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014793] CPU: 6 PID: 3286 Comm: nfsd Tainted: G          I   3.13.0-63-generic #103-Ubuntu
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014796] Hardware name: Dell Inc. PowerEdge R510/0DPRKF, BIOS 1.11.0 07/23/2012
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014799] task: ffff8805fdb1b000 ti: ffff8805e9016000 task.ti: ffff8805e9016000
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014801] RIP: 0010:[<ffffffff81372dd2>]  [<ffffffff81372dd2>] memcpy+0x12/0x110
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014810] RSP: 0018:ffff8805e90174d0  EFLAGS: 00010202
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014812] RAX: ffff8801410d4026 RBX: 0000000000000001 RCX: 0000000000000001
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014814] RDX: 0000000000000001 RSI: 0005080000000000 RDI: ffff8801410d4026
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014816] RBP: ffff8805e9017508 R08: 0000000000001000 R09: ffff8805e90174d8
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014818] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880041980850
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014820] R13: 0000160000000000 R14: ffff8801410d4027 R15: 0000000000000001
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014823] FS:  0000000000000000(0000) GS:ffff8806172c0000(0000) knlGS:0000000000000000
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014825] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014827] CR2: 0000000000cca000 CR3: 0000000001c0e000 CR4: 00000000000007e0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014829] Stack:
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014831]  ffffffffa016d63c 0000000000001000 ffff880608e3e800 ffff88060c94fea0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014835]  0000000000000000 ffff8800a142bc10 ffff880093063db0 ffff8805e90175c8
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014839]  ffffffffa015241c 0000000000000f60 0000000000000000 0000000000001000
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014843] Call Trace:
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014870]  [<ffffffffa016d63c>] ? read_extent_buffer+0xbc/0x110 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014890]  [<ffffffffa015241c>] btrfs_get_extent+0x91c/0x970 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014911]  [<ffffffffa0169837>] __do_readpage+0x357/0x730 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014929]  [<ffffffffa0151b00>] ? btrfs_real_readdir+0x5b0/0x5b0 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014950]  [<ffffffffa0169f92>] __extent_readpages.constprop.41+0x2a2/0x2c0 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014968]  [<ffffffffa0151b00>] ? btrfs_real_readdir+0x5b0/0x5b0 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.014988]  [<ffffffffa016be16>] extent_readpages+0x1b6/0x1c0 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015006]  [<ffffffffa0151b00>] ? btrfs_real_readdir+0x5b0/0x5b0 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015016]  [<ffffffffa00edb1d>] ? ixgbe_xmit_frame+0x3d/0x80 [ixgbe]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015022]  [<ffffffff81197f83>] ? alloc_pages_current+0xa3/0x160
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015040]  [<ffffffffa014fc5f>] btrfs_readpages+0x1f/0x30 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015046]  [<ffffffff8115bdb9>] __do_page_cache_readahead+0x1b9/0x260
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015050]  [<ffffffff8115c292>] ondemand_readahead+0x152/0x2a0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015054]  [<ffffffff8115c411>] page_cache_sync_readahead+0x31/0x50
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015059]  [<ffffffff811ece1b>] __generic_file_splice_read+0x53b/0x5a0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015064]  [<ffffffff811eb6e0>] ? page_cache_pipe_buf_release+0x20/0x20
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015068]  [<ffffffff81365580>] ? cpumask_next_and+0x30/0x50
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015073]  [<ffffffff810a6cf3>] ? find_busiest_group+0x133/0x890
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015078]  [<ffffffff811d88f3>] ? find_inode+0xa3/0xb0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015096]  [<ffffffffa014ef80>] ? btrfs_clean_one_deleted_snapshot+0x110/0x110 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015100]  [<ffffffff811d9c64>] ? iget5_locked+0x94/0x1e0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015117]  [<ffffffffa014f320>] ? create_pinned_em+0x140/0x140 [btrfs]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015121]  [<ffffffff811d9f8b>] ? iput+0x3b/0x180
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015126]  [<ffffffff811ecebe>] generic_file_splice_read+0x3e/0x80
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015129]  [<ffffffff811ebd66>] do_splice_to+0x66/0x80
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015133]  [<ffffffff811ebe27>] splice_direct_to_actor+0xa7/0x1e0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015143]  [<ffffffffa02ef940>] ? fsid_source+0x60/0x60 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015152]  [<ffffffffa02efb91>] nfsd_vfs_read.isra.12+0x151/0x160 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015162]  [<ffffffffa02f36e8>] nfsd_read_file+0x68/0xa0 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015173]  [<ffffffffa030149e>] nfsd4_encode_read+0x16e/0x260 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015185]  [<ffffffffa030982f>] nfsd4_encode_operation+0x5f/0xc0 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015196]  [<ffffffffa02ff20f>] nfsd4_proc_compound+0x21f/0x7d0 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015204]  [<ffffffffa02ebd3b>] nfsd_dispatch+0xbb/0x200 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015223]  [<ffffffffa024563d>] svc_process_common+0x46d/0x6d0 [sunrpc]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015238]  [<ffffffffa02459a7>] svc_process+0x107/0x170 [sunrpc]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015246]  [<ffffffffa02eb71f>] nfsd+0xbf/0x130 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015254]  [<ffffffffa02eb660>] ? nfsd_destroy+0x80/0x80 [nfsd]
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015259]  [<ffffffff8108b7d2>] kthread+0xd2/0xf0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015263]  [<ffffffff8108b700>] ? kthread_create_on_node+0x1c0/0x1c0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015268]  [<ffffffff817347e8>] ret_from_fork+0x58/0x90
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015271]  [<ffffffff8108b700>] ? kthread_create_on_node+0x1c0/0x1c0
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015273] Code: 66 0f 1f 84 00 00 00 00 00 e8 fb fb ff ff eb e2 90 90 90 90 90 90 90 90 90 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 <f3> a4 c3 20 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015306] RIP  [<ffffffff81372dd2>] memcpy+0x12/0x110
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015310]  RSP <ffff8805e90174d0>
  Sep 22 21:43:35 lgin0001 kernel: [1584766.015313] ---[ end trace 1f6f30e209f8104b ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-63-generic 3.13.0-63.103
  ProcVersionSignature: Ubuntu 3.13.0-63.103-generic 3.13.11-ckt25
  Uname: Linux 3.13.0-63-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.12
  Architecture: amd64
  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: Thu Sep 24 11:40:11 2015
  HibernationDevice: RESUME=UUID=f2d0fc4a-75fe-4b10-816c-5378020c5578
  InstallationDate: Installed on 2015-01-23 (243 days ago)
  InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
  MachineType: Dell Inc. PowerEdge R510
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.13.0-63-generic root=UUID=f7cf4d5a-fff2-45c1-affe-5b61a7eacce3 ro rootflags=subvol=@ acpi=force
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-63-generic N/A
   linux-backports-modules-3.13.0-63-generic  N/A
   linux-firmware                             1.127.15
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 07/23/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.11.0
  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.:bvr1.11.0:bd07/23/2012:svnDellInc.:pnPowerEdgeR510:pvr:rvnDellInc.:rn0DPRKF:rvrA03:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R510
  dmi.sys.vendor: Dell Inc.

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