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[Jacky Wang <jacky.chao.wang@xxxxxxxxx>]

v4.7-rc2 kernel (http://kernel.ubuntu.com/~kernel-
ppa/mainline/v4.7-rc2-yakkety/) sees the same issue:

[   70.064983] kernel BUG at /home/kernel/COD/linux/drivers/md/bcache/super.c:1822!
[   70.065214] invalid opcode: 0000 [#1] SMP
[   70.065355] Modules linked in: fuse ppdev input_leds lpc_ich intel_powerclamp led_class joydev serio_raw parport_pc sg i2c_piix4 ac battery parport mac_hid acpi_cpufreq ib_iser rdma_cm iw_cm ib_cm ib_core configfs 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 md_mod sr_mod cdrom sd_mod ata_generic pata_acpi hid_generic usbhid hid ohci_pci crct10dif_pclmul virtio_net crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel ahci aes_x86_64 lrw gf128mul libahci glue_helper ablk_helper cryptd ohci_hcd ehci_pci ata_piix ehci_hcd libata usbcore scsi_mod psmouse usb_common fjes virtio_pci virtio_ring virtio video button jitterentropy_rng drbg ansi_cprng

[   70.071156] CPU: 3 PID: 1557 Comm: bcache-register Not tainted 4.7.0-040700rc2-generic #201606051831
[   70.071417] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[   70.071655] task: ffff8800775f0000 ti: ffff88007bf84000 task.ti: ffff88007bf84000
[   70.072051] RIP: 0010:[<ffffffffc02e4ff6>]  [<ffffffffc02e4ff6>] cache_alloc.isra.21+0x646/0x670 [bcache]
[   70.072757] RSP: 0018:ffff88007bf87d18  EFLAGS: 00010246
[   70.073129] RAX: ffff88007757b070 RBX: ffff88007c228000 RCX: 00000000000007f8
[   70.073516] RDX: 00000000000007f7 RSI: 0000000000000000 RDI: ffff88007d003b80
[   70.073902] RBP: ffff88007bf87d30 R08: ffff88007fd99f40 R09: ffff88007d003b80
[   70.074288] R10: ffff88007757b070 R11: 0000000000000040 R12: 0000000000000000
[   70.074674] R13: 0000000000000010 R14: ffff88007b2308f0 R15: ffff880078479000
[   70.075061] FS:  00007f2bd2778700(0000) GS:ffff88007fd80000(0000) knlGS:0000000000000000
[   70.075708] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   70.076064] CR2: 00007f2bd21e1130 CR3: 0000000079a4b000 CR4: 00000000000406e0
[   70.076452] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   70.076854] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   70.077267] Stack:
[   70.077565]  ffff880035568340 ffffea0001efbcc0 ffff88007c228000 ffff88007bf87dd0
[   70.078547]  ffffffffc02e83f9 ffff88007952b500 ffff880035648f00 000000000000005b
[   70.079455]  0000000000000080 ffff88007c228008 ffff88007757b080 0000000000000009
[   70.081160] Call Trace:
[   70.081755]  [<ffffffffc02e83f9>] register_bcache+0x2d9/0x1190 [bcache]
[   70.082165]  [<ffffffff813cabcf>] kobj_attr_store+0xf/0x20
[   70.082530]  [<ffffffff813cabcf>] ? kobj_attr_store+0xf/0x20
[   70.082902]  [<ffffffff812a5ce7>] sysfs_kf_write+0x37/0x40
[   70.083278]  [<ffffffff812a5058>] kernfs_fop_write+0x118/0x1a0
[   70.083635]  [<ffffffff81222287>] __vfs_write+0x37/0x160
[   70.083977]  [<ffffffff81370188>] ? apparmor_file_permission+0x18/0x20
[   70.084349]  [<ffffffff8133084d>] ? security_file_permission+0x3d/0xc0
[   70.084721]  [<ffffffff810cb912>] ? percpu_down_read+0x12/0x50
[   70.085075]  [<ffffffff812235e8>] vfs_write+0xb8/0x1b0
[   70.085412]  [<ffffffff81224a85>] SyS_write+0x55/0xc0
[   70.086226]  [<ffffffff81719d36>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[   70.086631] Code: 6a fd ff ff e9 4d fd ff ff be c0 00 40 02 4c 89 e7 e8 bf aa f1 c0 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 2a a2 ef c0 48 85 c0 48 89
[   70.090234] RIP  [<ffffffffc02e4ff6>] cache_alloc.isra.21+0x646/0x670 [bcache]
[   70.090848]  RSP <ffff88007bf87d18>
[   70.091365] ---[ end trace 241fa6e06ca0e7af ]---

** Tags added: kernel-bug-exists-upstream

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

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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:
  Confirmed

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 ]---
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-05-29 (0 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Tags:  xenial
  Uname: Linux 4.4.11-040411-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-05-29 (0 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Tags:  xenial
  Uname: Linux 4.4.11-040411-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True

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