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[Bug 1532145] Re: Kernel Panic wrt btrfs while sbuild/schroot


I suggest a workaround for the moment, using aufs as the overlay to see
if this helps.

Modify the chroot config and set the union-type to aufs:


you may see an error like:

"aufs au_xino_create:778:mount[3600]: xino doesn't support

this is caused by the fact that btrfs cannot store aufs xino files.
aufs tries to store these files alongside the rw layer. If that fails,
it tries to store them in /tmp/.aufs.xino, however, if this is btrfs it
will fail. So the workaround for that is to mount /tmp as something
other than btrfs,  e.g. tmpfs

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  Kernel Panic wrt btrfs while sbuild/schroot

Status in Linux:
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

  I can't use sbuild, cause it crashes.

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

  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
   PATH=(custom, no user)
  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
   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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