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[sirblackheart <rauter.gabriel@xxxxxxxxx>]

I get the same error when i try to do the following:

Start ubuntu:wily image trough docker and have the kernel sources mounted in a ro mountpoint.
Use overlayfs to have a rw version of it:
mount -t overlay overlay -o lowerdir=/linux-ro/,upperdir=/linux-up,workdir=/linux-work /linux
when i try to compile the kernel with make -j4 ... my system crashes after 1-2 sec

Host system is Archlinux with btrfs as filesystem.

Sep 16 20:21:34 Lilith kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000334
Sep 16 20:21:34 Lilith kernel: IP: [<ffffffffa0468f43>] btrfs_sync_file+0xe3/0x380 [btrfs]
Sep 16 20:21:34 Lilith kernel: PGD 202916067 PUD 1308ce067 PMD 0 
Sep 16 20:21:34 Lilith kernel: Oops: 0002 [#1] PREEMPT SMP 
Sep 16 20:21:34 Lilith kernel: Modules linked in: overlay rfcomm veth cmac ecb fuse xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv
Sep 16 20:21:34 Lilith kernel:  crc32c_generic btrfs xor raid6_pq sd_mod hid_generic usbhid hid uas usb_storage atkbd libps2 radeon ahci libahci ohci_pci ohci_hcd ehci_pci i2c_algo_bit ehci_
Sep 16 20:21:34 Lilith kernel: CPU: 2 PID: 27896 Comm: vdsomunge Not tainted 4.2.0-3-ARCH #1
Sep 16 20:21:34 Lilith kernel: Hardware name: To be filled by O.E.M. To be filled by O.E.M./SABERTOOTH 990FX, BIOS 1604 10/16/2012
Sep 16 20:21:34 Lilith kernel: task: ffff880132754b00 ti: ffff88018a054000 task.ti: ffff88018a054000
Sep 16 20:21:34 Lilith kernel: RIP: 0010:[<ffffffffa0468f43>]  [<ffffffffa0468f43>] btrfs_sync_file+0xe3/0x380 [btrfs]
Sep 16 20:21:34 Lilith kernel: RSP: 0018:ffff88018a057e08  EFLAGS: 00010296
Sep 16 20:21:34 Lilith kernel: RAX: ffff880132754b00 RBX: ffff880015468900 RCX: 0000000000000000
Sep 16 20:21:34 Lilith kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880201aeba58
Sep 16 20:21:34 Lilith kernel: RBP: ffff88018a057e98 R08: 0000000000000001 R09: ffff880015468900
Sep 16 20:21:34 Lilith kernel: R10: 00000000000002fc R11: 0000000000000246 R12: ffff880201aeba58
Sep 16 20:21:34 Lilith kernel: R13: ffff880201aeb9b0 R14: 0000000000000000 R15: 0000000000000000
Sep 16 20:21:34 Lilith kernel: FS:  00002ab262e61b40(0000) GS:ffff88023fc80000(0000) knlGS:0000000000000000
Sep 16 20:21:34 Lilith kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 16 20:21:34 Lilith kernel: CR2: 0000000000000334 CR3: 000000013d7d7000 CR4: 00000000000006e0
Sep 16 20:21:34 Lilith kernel: Stack:
Sep 16 20:21:34 Lilith kernel:  ffff88018a057e58 ffffffff8126f90f 0000000000001000 ffff880201a02840
Sep 16 20:21:34 Lilith kernel:  0000000000000fff 0000000000000000 ffff880000000055 ffff880000000204
Sep 16 20:21:34 Lilith kernel:  0000000000000001 0000000000000000 ffffea0005796b00 00000000da3419dd
Sep 16 20:21:34 Lilith kernel: Call Trace:
Sep 16 20:21:34 Lilith kernel:  [<ffffffff8126f90f>] ? security_mmap_file+0x5f/0xe0
Sep 16 20:21:34 Lilith kernel:  [<ffffffff81201e2b>] vfs_fsync_range+0x4b/0xb0
Sep 16 20:21:34 Lilith kernel:  [<ffffffff8119326e>] SyS_msync+0x17e/0x1f0
Sep 16 20:21:34 Lilith kernel:  [<ffffffff81570a6e>] entry_SYSCALL_64_fastpath+0x12/0x71
Sep 16 20:21:34 Lilith kernel: Code: eb 8e e8 f5 a0 b9 e0 eb 87 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 6d 59 10 e1 <f0> 41 ff 87 34 03 00 0
Sep 16 20:21:34 Lilith kernel: RIP  [<ffffffffa0468f43>] btrfs_sync_file+0xe3/0x380 [btrfs]
Sep 16 20:21:34 Lilith kernel:  RSP <ffff88018a057e08>
Sep 16 20:21:34 Lilith kernel: CR2: 0000000000000334
Sep 16 20:21:34 Lilith kernel: ---[ end trace 6f6b5de737c62bb0 ]---

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https://bugs.launchpad.net/bugs/1496438

Title:
  4.2.0.7 BUG: unable to handle kernel NULL pointer dereference at
  0000000000000334

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I don't know how to reproduce this, as it worked for 2 weeks before
  happening, but was consistent then.

  I used btrfs on top of bcache on top of lvm. While trying to sbuild a
  package I got strange errors, got this messge in dmesg.

  Kernel 4.2.0-7-lowlatency release: wily:

  lsblk:
  NAME             MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
  sda                8:0    0 465,8G  0 disk  
  ├─hdd-Work       252:4    0 232,9G  0 lvm   
  │ └─bcache0      251:0    0 232,9G  0 disk  /home
  └─hdd-Home       252:5    0 232,9G  0 lvm   
    └─bcache1      251:1    0 232,9G  0 disk  /media/Work
  sdb                8:16   0 238,5G  0 disk  
  ├─sdb1             8:17   0   512M  0 part  /boot/efi
  ├─sdb2             8:18   0   244M  0 part  /boot
  └─sdb3             8:19   0 237,8G  0 part  
    ├─ssd-root     252:0    0    64G  0 lvm   /
    ├─ssd-bcache   252:1    0    64G  0 lvm   
    │ ├─bcache0    251:0    0 232,9G  0 disk  /home
    │ └─bcache1    251:1    0 232,9G  0 disk  /media/Work
    ├─ssd-swap     252:2    0     8G  0 lvm   
    │ └─cryptswap1 252:6    0     8G  0 crypt [SWAP]
    └─ssd-Free     252:3    0 101,8G  0 lvm   /media/Free
  loop0              7:0    0   800M  0 loop  
  └─secrets        252:7    0   798M  0 crypt /home/kick/Secrets

  Kernel traces:
  [  224.670454] BUG: unable to handle kernel NULL pointer dereference at 0000000000000334
  [  224.672387] IP: [<ffffffffc0305601>] btrfs_sync_file+0xc1/0x360 [btrfs]
  [  224.674261] PGD 8451a067 PUD 84527067 PMD 0
  [  224.676056] Oops: 0002 [#1] PREEMPT SMP
  [  224.677810] Modules linked in: algif_skcipher af_alg ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables ip6_tables overlay xt_addrtype xt_conntrack xt_CHECKSUM ax88179_178a iptable_mangle usbnet ipt_MASQUERADE rtsx_usb_ms nf_nat_masquerade_ipv4 aufs iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 mii memstick nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc binfmt_misc iptable_filter ip_tables x_tables bnep drbg ansi_cprng dm_crypt nls_iso8859_1 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul snd_soc_rt5640 glue_helper ablk_helper snd_soc_rl6231 cryptd snd_soc_core input_leds serio_raw hid_sensor_rotation snd_compress ac97_bus snd_pcm_dmaengine snd_seq_midi snd_seq_midi_event snd_hda_codec_realtek
  [  224.683606]  hid_sensor_incl_3d uvcvideo videobuf2_vmalloc snd_hda_codec_generic hid_sensor_als videobuf2_memops hid_sensor_magn_3d snd_hda_codec_hdmi hid_sensor_accel_3d hid_sensor_gyro_3d btusb hid_sensor_trigger btrtl industrialio_triggered_buffer btbcm snd_rawmidi joydev btintel videobuf2_core kfifo_buf snd_hda_intel industrialio snd_hda_codec hid_sensor_iio_common v4l2_common videodev snd_hda_core hid_multitouch snd_hwdep media bluetooth mei_me snd_seq lpc_ich mei snd_pcm snd_seq_device dw_dmac dw_dmac_core snd_timer snd soundcore ideapad_laptop sparse_keymap 8250_dw i2c_designware_platform mac_hid spi_pxa2xx_platform soc_button_array i2c_designware_core snd_soc_sst_acpi kvm_intel kvm parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq hid_sensor_custom hid_sensor_hub uas usb_storage bcache
  [  224.689905]  hid_generic usbhid rtsx_usb_sdmmc rtsx_usb i915 i2c_algo_bit drm_kms_helper drm psmouse ahci libahci sdhci_acpi sdhci video i2c_hid hid
  [  224.694241] CPU: 1 PID: 2915 Comm: debconf-set-sel Tainted: G        W       4.2.0-7-lowlatency #7-Ubuntu
  [  224.696433] Hardware name: LENOVO 20344/INVALID, BIOS 96CN25WW(V1.11) 07/09/2014
  [  224.698641] task: ffff880099723800 ti: ffff880084510000 task.ti: ffff880084510000
  [  224.700843] RIP: 0010:[<ffffffffc0305601>]  [<ffffffffc0305601>] btrfs_sync_file+0xc1/0x360 [btrfs]
  [  224.703068] RSP: 0018:ffff880084513e38  EFLAGS: 00010292
  [  224.705272] RAX: ffff880099723800 RBX: ffff880159625400 RCX: 0000000000000000
  [  224.707505] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880098237a58
  [  224.709733] RBP: ffff880084513eb8 R08: 0000000000000001 R09: 0000000001f94ff0
  [  224.711962] R10: 000000000000009c R11: 0000000000000246 R12: ffff880098237a58
  [  224.714191] R13: ffff8800982379b0 R14: 0000000000000000 R15: 0000000000000000
  [  224.716431] FS:  00007fdffa459700(0000) GS:ffff88015f240000(0000) knlGS:0000000000000000
  [  224.718656] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  224.720882] CR2: 0000000000000334 CR3: 000000008456a000 CR4: 00000000001406e0
  [  224.723098] Stack:
  [  224.725289]  ffff880159625410 0000000200000001 8000000000000000 ffff8800981d7d80
  [  224.727494]  7fffffffffffffff 0000000000000000 0000000000000000 ffff88009a803000
  [  224.729686]  0000000000001144 0000000000000002 ffff880084513ea8 ffff880159625400
  [  224.731860] Call Trace:
  [  224.733994]  [<ffffffff8122468b>] vfs_fsync_range+0x4b/0xb0
  [  224.736142]  [<ffffffff8122474d>] do_fsync+0x3d/0x70
  [  224.738275]  [<ffffffff812249d0>] SyS_fsync+0x10/0x20
  [  224.740379]  [<ffffffff817c4bf2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  224.742476] Code: eb a1 e8 37 da cf c0 eb 9a 48 8b 45 a0 4c 8b 75 a8 4d 8d a5 a8 00 00 00 4c 89 e7 4c 29 f0 48 83 c0 01 48 89 45 90 e8 0f d4 4b c1 <f0> 41 ff 87 34 03 00 00 49 8b 85 70 ff ff ff 48 c1 e8 07 83 e0
  [  224.744787] RIP  [<ffffffffc0305601>] btrfs_sync_file+0xc1/0x360 [btrfs]
  [  224.746956]  RSP <ffff880084513e38>
  [  224.749088] CR2: 0000000000000334
  [  224.751273] ---[ end trace 7e8588f0d9eb10fa ]---

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