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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1586838

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1586838

Title:
  bcache causes a kernel bug when adding a new cache device

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 16.04 on virtualbox 5.0.20. VirtualBoxAddition is installed.

  The issue happens on both out-of-box 4.4.0 kernel and the later-
  installed 4.4.11 kernel. 100% re-producible. The same issue applies to
  both virtual hard drive (/dev/sdb) and file-base block device
  (/dev/loop2) I created within Ubuntu.

  $ sudo make-bcache -C /dev/sdb

  The error shows (through dmesg):
  [   47.616016] ------------[ cut here ]------------
  [   47.616035] kernel BUG at /home/kernel/COD/linux/drivers/md/bcache/super.c:1822!
  [   47.616051] invalid opcode: 0000 [#1] SMP
  [   47.616063] Modules linked in: vboxsf(OE) ppdev vboxvideo(OE) ttm drm_kms_helper input_leds joydev drm serio_raw lpc_ich fb_sys_fops syscopyarea i2c_piix4 sysfillrect sysimgblt 8250_fintek parport_pc vboxguest(OE) parport mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 multipath linear bcache raid0 hid_generic usbhid hid crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse fjes ahci libahci pata_acpi video
  [   47.616255] CPU: 2 PID: 1247 Comm: bcache-register Tainted: G           OE   4.4.11-040411-generic #201605182255
  [   47.616277] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
  [   47.616295] task: ffff880035140000 ti: ffff880076840000 task.ti: ffff880076840000
  [   47.616311] RIP: 0010:[<ffffffffc0134086>]  [<ffffffffc0134086>] cache_alloc.isra.20+0x646/0x670 [bcache]
  [   47.616340] RSP: 0018:ffff880076843d10  EFLAGS: 00010246
  [   47.616352] RAX: ffff880079528c60 RBX: ffff8800796a0000 RCX: 00000000000005d2
  [   47.616367] RDX: 00000000000005d1 RSI: 0000000000000000 RDI: 0000000000019d40
  [   47.616382] RBP: ffff880076843d28 R08: ffff88007fd19d40 R09: ffff88007d001d00
  [   47.616398] R10: ffff880079528c60 R11: ffff88007b590958 R12: 0000000000000000
  [   47.616413] R13: 0000000000000010 R14: ffff88007c3c4000 R15: ffff8800796a0000
  [   47.616428] FS:  00007ff8ffa10700(0000) GS:ffff88007fd00000(0000) knlGS:0000000000000000
  [   47.616445] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   47.616458] CR2: 00007ff8ff4c1d30 CR3: 0000000077f70000 CR4: 00000000000406e0
  [   47.616476] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [   47.616491] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [   47.616506] Stack:
  [   47.616511]  ffffea0001e880c0 ffff88007cc28680 0000000000000000 ffff880076843dd0
  [   47.616531]  ffffffffc01373e3 ffff880076843d58 ffffffff811c8de5 000000007fd61025
  [   47.616551]  00007ff8ff4cf000 ffff88007b590958 ffff8800796a0008 0000000000000009
  [   47.616570] Call Trace:
  [   47.616585]  [<ffffffffc01373e3>] register_bcache+0x2b3/0x1140 [bcache]
  [   47.616626]  [<ffffffff811c8de5>] ? page_add_file_rmap+0x25/0x60
  [   47.617074]  [<ffffffff8118b7b9>] ? unlock_page+0x69/0x70
  [   47.617516]  [<ffffffff813d25ef>] kobj_attr_store+0xf/0x20
  [   47.617946]  [<ffffffff81289147>] sysfs_kf_write+0x37/0x40
  [   47.618353]  [<ffffffff8128855d>] kernfs_fop_write+0x11d/0x170
  [   47.618755]  [<ffffffff81209a27>] __vfs_write+0x37/0x110
  [   47.619149]  [<ffffffff8137a238>] ? apparmor_file_permission+0x18/0x20
  [   47.619543]  [<ffffffff8133aead>] ? security_file_permission+0x3d/0xc0
  [   47.619922]  [<ffffffff810c8f12>] ? percpu_down_read+0x12/0x50
  [   47.620290]  [<ffffffff8120a139>] vfs_write+0xa9/0x1a0
  [   47.620648]  [<ffffffff8120adf5>] SyS_write+0x55/0xc0
  [   47.621021]  [<ffffffff81808332>] entry_SYSCALL_64_fastpath+0x16/0x71
  [   47.621362] Code: 6a fd ff ff e9 4d fd ff ff be c0 00 40 02 4c 89 e7 e8 cf 61 0b c1 48 85 c0 48 89 83 f0 0a 00 00 0f 85 96 fd ff ff e9 79 fd ff ff <0f> 0b 0f 0b 0f 0b bf 40 00 00 00 e8 9a 90 09 c1 48 85 c0 48 89
  [   47.622456] RIP  [<ffffffffc0134086>] cache_alloc.isra.20+0x646/0x670 [bcache]
  [   47.622812]  RSP <ffff880076843d10>
  [   47.623177] ---[ end trace 19bcd02731ac9be1 ]---

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