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[Bug 1586838] [NEW] bcache causes a kernel bug when adding a new cache device

 

Public bug reported:

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 ]---

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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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