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[Launchpad Bug Tracker <1212679@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/1212679

Title:
  btrfs segmentation fault when balancing after adding 4th disk to 3
  disk raid5

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  [ 1897.180398] ------------[ cut here ]------------
  [ 1897.181058] Kernel BUG at facfde70 [verbose debug info unavailable]
  [ 1897.181652] invalid opcode: 0000 [#1] SMP 
  [ 1897.182227] Modules linked in: hidp dm_crypt(F) joydev(F) cx22702 snd_hda_codec_realtek isl6421 snd_soc_wm8776 cx24116 snd_soc_core cx88_dvb cx88_vp3054_i2c videobuf_dvb snd_compress(F) wm8775 dvb_core ir_lirc_codec lirc_dev ir_mce_kbd_decoder hid_generic ir_sanyo_decoder ir_jvc_decoder ir_sony_decoder ir_rc6_decoder ir_rc5_decoder ir_nec_decoder rc_hauppauge usbhid hid btusb tuner_simple tuner_types tda9887 snd_hda_intel tda8290 cx88_alsa tuner snd_hda_codec snd_hwdep(F) cx8800 snd_pcm(F) cx8802 snd_page_alloc(F) cx88xx snd_seq_midi(F) snd_seq_midi_event(F) btcx_risc tveeprom snd_rawmidi(F) videobuf_dma_sg bnep rfcomm parport_pc(F) psmouse(F) rc_core ppdev(F) bluetooth serio_raw(F) snd_seq(F) v4l2_common nfsd(F) auth_rpcgss(F) nfs_acl(F) nfs(F) lockd(F) sunrpc(F) fscache(F) videobuf_core snd_seq_device(F) snd_timer(F) videodev snd(F) mac_hid k8temp ohci_pci soundcore(F) i2c_nforce2 lp(F) parport(F) usblp btrfs(F) xor(F) zlib_deflate(F) raid6_pq(F) libcrc32c(F) nouveau mxm_wmi wmi video(F) i2c_algo_bit ttm pata_acpi drm_kms_helper drm pata_amd sata_nv forcedeth ahci(F) libahci(F)
  [ 1897.184274] CPU: 0 PID: 6899 Comm: btrfs-balance Tainted: GF            3.11.0-2-generic #5-Ubuntu
  [ 1897.184274] Hardware name: Gigabyte Technology Co., Ltd. M61P-S3/M61P-S3, BIOS F7f 06/18/2009
  [ 1897.184274] task: f5884d40 ti: ea904000 task.ti: ea904000
  [ 1897.184274] EIP: 0060:[<facfde70>] EFLAGS: 00010246 CPU: 0
  [ 1897.184274] EIP is at build_backref_tree+0x210/0xf40 [btrfs]
  [ 1897.184274] EAX: ef31f0c0 EBX: ef31f0c8 ECX: ea905c78 EDX: 00000000
  [ 1897.184274] ESI: db829b40 EDI: 00000000 EBP: ea905cb8 ESP: ea905c28
  [ 1897.184274]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
  [ 1897.184274] CR0: 8005003b CR2: aefa7000 CR3: 2faae000 CR4: 000007f0
  [ 1897.184274] Stack:
  [ 1897.184274]  db829120 00000000 00000000 02905c54 f00f3894 db829660 00000004 ed28c000
  [ 1897.184274]  db82968c efc610e0 ea326094 eafbcb40 db829b40 db829660 ea326000 00000000
  [ 1897.184274]  ea326010 efc61150 00000000 00000000 ea905c78 ea905c78 ea905c80 ea905c80
  [ 1897.184274] Call Trace:
  [ 1897.184274]  [<facfed79>] relocate_tree_blocks+0x1d9/0x610 [btrfs]
  [ 1897.184274]  [<facfd729>] ? add_data_references+0x239/0x250 [btrfs]
  [ 1897.184274]  [<facffdae>] relocate_block_group+0x25e/0x650 [btrfs]
  [ 1897.184274]  [<fad00352>] btrfs_relocate_block_group+0x1b2/0x310 [btrfs]
  [ 1897.184274]  [<facd6af9>] btrfs_relocate_chunk.isra.28+0x59/0x720 [btrfs]
  [ 1897.184274]  [<facd40ba>] ? read_extent_buffer+0xaa/0xf0 [btrfs]
  [ 1897.184274]  [<c163617d>] ? _raw_spin_lock+0xd/0x10
  [ 1897.184274]  [<faccc6d8>] ? release_extent_buffer+0x58/0xb0 [btrfs]
  [ 1897.184274]  [<facd317d>] ? free_extent_buffer+0x4d/0xa0 [btrfs]
  [ 1897.184274]  [<facdb851>] __btrfs_balance+0x481/0x8c0 [btrfs]
  [ 1897.184274]  [<facdc19a>] btrfs_balance+0x50a/0x730 [btrfs]
  [ 1897.184274]  [<facdc427>] balance_kthread+0x67/0x70 [btrfs]
  [ 1897.184274]  [<facdc3c0>] ? btrfs_balance+0x730/0x730 [btrfs]
  [ 1897.184274]  [<c1070074>] kthread+0x94/0xa0
  [ 1897.184274]  [<c1070000>] ? kthread+0x20/0xa0
  [ 1897.184274]  [<c163d837>] ret_from_kernel_thread+0x1b/0x28
  [ 1897.184274]  [<c106ffe0>] ? kthread_create_on_node+0xc0/0xc0
  [ 1897.184274] Code: e8 01 89 47 20 8b 45 a4 f6 40 45 10 0f 85 be 09 00 00 8b 7d a4 8b 47 2c 8d 77 2c 89 75 90 39 c6 74 0b 3b 47 30 0f 84 4a 08 00 00 <0f> 0b c7 45 ac 00 00 00 00 8d b4 26 00 00 00 00 e8 0b 6d 93 c6
  [ 1897.184274] EIP: [<facfde70>] build_backref_tree+0x210/0xf40 [btrfs] SS:ESP 0068:ea905c28
  [ 1897.214978] ---[ end trace c3a3e666541660a2 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.11.0-2-generic 3.11.0-2.5
  ProcVersionSignature: Ubuntu 3.11.0-2.5-generic 3.11.0-rc5
  Uname: Linux 3.11.0-2-generic i686
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  robert     4167 F.... pulseaudio
   /dev/snd/controlC1:  robert     4167 F.... pulseaudio
  Date: Thu Aug 15 15:26:08 2013
  IwConfig:
   tap0      no wireless extensions.
   
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  Lsusb:
   Bus 002 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
   Bus 002 Device 003: ID 0e6a:6001 Megawin Technology Co., Ltd GEMBIRD Flexible keyboard KB-109F-B-DE
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Gigabyte Technology Co., Ltd. M61P-S3
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-2-generic root=UUID=7a3c13e0-efa7-4551-b899-ff2f9b401d3a ro quiet splash max_loop=64 vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-2-generic N/A
   linux-backports-modules-3.11.0-2-generic  N/A
   linux-firmware                            1.106
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-23 (113 days ago)
  dmi.bios.date: 06/18/2009
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F7f
  dmi.board.name: M61P-S3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF7f:bd06/18/2009:svnGigabyteTechnologyCo.,Ltd.:pnM61P-S3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnM61P-S3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: M61P-S3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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