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[Colin Ian King <1532145@xxxxxxxxxxxxxxxxxx>]

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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

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https://bugs.launchpad.net/bugs/1532145

Title:
  Kernel Panic wrt btrfs while sbuild/schroot

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  In Progress

Bug description:
  I'm running ubuntu Wily amd64 on a MSI Ghost Pro laptop.

  I'm running btrfs on top of a bcached dmraid setup(intel software
  raid0).

  I can't use sbuild, cause it crashes.

  I tried to use  a schroot env, and when updating it I got it to crash
  also.

  All the keyboard/mouse/X11 are stalled, but I could ssh to it.
  Trying to restart lightdm service didn't help.

  I've got a kernel trace in the dmesg:

  [76610.550953] BUG: unable to handle kernel NULL pointer dereference at 0000000000000334
  [76610.550983] IP: [<ffffffffc032fe6c>] btrfs_sync_file+0xcc/0x360 [btrfs]
  [76610.551025] PGD 160aaf067 PUD 161531067 PMD 0 
  [76610.551039] Oops: 0002 [#1] SMP 
  [76610.551050] Modules linked in: dm_crypt algif_skcipher af_alg drbg ansi_cprng ctr ccm rfcomm ipt_REJECT nf_reject_ipv4 nvram msr xt_multiport ebtable_filter ebtables ip6table_filter ip6_tables overlay bnep uvcvideo btusb videobuf2_vmalloc videobuf2_memops btrtl btbcm videobuf2_core btintel v4l2_common bluetooth videodev media xt_addrtype xt_conntrack xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge aufs stp llc iptable_filter ip_tables x_tables binfmt_misc arc4 nls_iso8859_1 msi_wmi sparse_keymap intel_rapl iosf_mbi x86_pkg_temp_thermal snd_hda_codec_hdmi intel_powerclamp coretemp crct10dif_pclmul snd_hda_codec_realtek snd_hda_codec_generic crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul
  [76610.551253]  snd_hda_intel iwlmvm glue_helper snd_hda_codec ablk_helper mac80211 cryptd snd_hda_core snd_hwdep snd_pcm snd_seq_midi joydev input_leds snd_seq_midi_event snd_rawmidi serio_raw iwlwifi lpc_ich mei_me snd_seq mei cfg80211 snd_seq_device snd_timer snd ie31200_edac edac_core soundcore shpchp mac_hid kvm_intel kvm parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq dm_mirror dm_region_hash dm_log uas usb_storage bcache hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper psmouse ahci drm alx libahci mdio wmi video
  [76610.551395] CPU: 1 PID: 32090 Comm: dpkg Not tainted 4.2.0-23-generic #28-Ubuntu
  [76610.551414] Hardware name: Micro-Star International Co., Ltd. GS60 2PE Ghost Pro/MS-16H2, BIOS E16H2IMS.112 05/05/2015
  [76610.551438] task: ffff8803cf422940 ti: ffff8801a0be4000 task.ti: ffff8801a0be4000
  [76610.551455] RIP: 0010:[<ffffffffc032fe6c>]  [<ffffffffc032fe6c>] btrfs_sync_file+0xcc/0x360 [btrfs]
  [76610.551485] RSP: 0018:ffff8801a0be7e28  EFLAGS: 00010292
  [76610.551497] RAX: ffff8803cf422940 RBX: ffff880273bff100 RCX: 0000000000000000
  [76610.551513] RDX: 0000000080000000 RSI: 0000000000000000 RDI: ffff88040a2fb178
  [76610.551530] RBP: ffff8801a0be7eb8 R08: 0000000000000001 R09: 0000000000000000
  [76610.551546] R10: 00000000000001f6 R11: 0000000000000246 R12: ffff88040a2fb178
  [76610.551563] R13: ffff88040a2fb0d0 R14: 0000000000000000 R15: 0000000000000000
  [76610.551580] FS:  00007f3c27bca800(0000) GS:ffff88041fa40000(0000) knlGS:0000000000000000
  [76610.551598] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [76610.551611] CR2: 0000000000000334 CR3: 000000016159a000 CR4: 00000000001406e0
  [76610.551628] Stack:
  [76610.551633]  800000033fffa865 000000000000000b 8000000000000000 ffff88008a657e40
  [76610.551652]  7fffffffffffffff 0000000000000000 ffff8801a0be7ea8 ffff8804069544a0
  [76610.551671]  0000800173bff000 0000000010b6e564 0000000000000000 0000000010b6e564
  [76610.551691] Call Trace:
  [76610.551703]  [<ffffffff8122fe9b>] vfs_fsync_range+0x4b/0xb0
  [76610.551718]  [<ffffffff8122ff5d>] do_fsync+0x3d/0x70
  [76610.551732]  [<ffffffff81230200>] SyS_fsync+0x10/0x20
  [76610.551751]  [<ffffffff817f02b2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [76610.551766] Code: 8b 0e 48 85 c9 75 e8 eb 9e 48 8b 45 90 4c 8b 75 98 4d 8d a5 a8 00 00 00 4c 89 e7 4c 29 f0 48 83 c0 01 48 89 45 80 e8 f4 e2 4b c1 <f0> 41 ff 87 34 03 00 00 49 8b 85 70 ff ff ff 48 c1 e8 07 83 e0 
  [76610.551845] RIP  [<ffffffffc032fe6c>] btrfs_sync_file+0xcc/0x360 [btrfs]
  [76610.551871]  RSP <ffff8801a0be7e28>
  [76610.551881] CR2: 0000000000000334
  [76610.558028] ---[ end trace 33509d397c46cd18 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-23-generic 4.2.0-23.28
  ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
  Uname: Linux 4.2.0-23-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  Date: Fri Jan  8 11:02:06 2016
  HibernationDevice: RESUME=UUID=1699e24b-be2c-494d-90ff-0f313a5eed84
  InstallationDate: Installed on 2015-11-24 (44 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151016)
  MachineType: Micro-Star International Co., Ltd. GS60 2PE Ghost Pro
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-23-generic.efi.signed root=UUID=e8f9dc8a-aa49-481d-8fcc-be8cff0f61b1 ro rootflags=subvol=@ blacklist=nouveau quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-23-generic N/A
   linux-backports-modules-4.2.0-23-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] Aucun fichier ou dossier de ce type: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/05/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: E16H2IMS.112
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: MS-16H2
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: REV:0.B
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 10
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrE16H2IMS.112:bd05/05/2015:svnMicro-StarInternationalCo.,Ltd.:pnGS602PEGhostPro:pvrREV1.0:rvnMicro-StarInternationalCo.,Ltd.:rnMS-16H2:rvrREV0.B:cvnToBeFilledByO.E.M.:ct10:cvrToBeFilledByO.E.M.:
  dmi.product.name: GS60 2PE Ghost Pro
  dmi.product.version: REV:1.0
  dmi.sys.vendor: Micro-Star International Co., Ltd.

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