Excellent thanks a lot Kent, that's fixed the problem with the lv cache device.
I am experiencing a problem attempting to use a rbd as a backing
device also. This was working in 3.1 partially so I'm not sure what's
changed there. The following is output to console & syslog whenever
the bcache0 device is accessed by something. Well by blkid or
mkfs.ext4.
Jan 23 11:49:29 dev1 kernel: [ 280.993416] BUG: unable to handle
kernel NULL pointer dereference at (null)
Jan 23 11:49:29 dev1 kernel: [ 280.995317] IP: [< (null)>]
(null)
Jan 23 11:49:29 dev1 kernel: [ 280.997180] PGD 401b0d067 PUD 3fbfa1067 PMD 0
Jan 23 11:49:29 dev1 kernel: [ 280.999034] Oops: 0010 [#2] SMP
Jan 23 11:49:29 dev1 kernel: [ 281.000831] CPU 2
Jan 23 11:49:29 dev1 kernel: [ 281.000843] Modules linked in: bnep
rfcomm bluetooth ip6table_filter ip6_tables ebtable_nat ebtables
ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp
iptable_filter ip_tables x_tables kvm_intel kvm parport_pc ppdev
binfmt_misc usbhid hid snd_hda_codec_hdmi snd_hda_codec_realtek bridge
stp snd_seq_midi psmouse eeepc_wmi radeon ttm drm_kms_helper asus_wmi
snd_rawmidi drm sparse_keymap snd_seq_midi_event snd_hda_intel
snd_hda_codec snd_hwdep snd_pcm snd_seq snd_timer snd_seq_device snd
mac_hid video serio_raw soundcore dm_multipath wmi i2c_algo_bit
snd_page_alloc mei(C) rbd libceph lp parport firewire_ohci
firewire_core btrfs pata_marvell crc_itu_t e1000e r8169 zlib_deflate
libcrc32c
Jan 23 11:49:29 dev1 kernel: [ 281.012308]
Jan 23 11:49:29 dev1 kernel: [ 281.014277] Pid: 4152, comm: blkid
Tainted: G D C 3.2.0-9-generic #17~oneiric1 System
manufacturer System Product Name/P8H67-M EVO
Jan 23 11:49:29 dev1 kernel: [ 281.016330] RIP:
0010:[<0000000000000000>] [< (null)>] (null)
Jan 23 11:49:29 dev1 kernel: [ 281.018364] RSP: 0018:ffff8803fbc3de60
EFLAGS: 00010282
Jan 23 11:49:29 dev1 kernel: [ 281.020397] RAX: ffffffffa00763a0 RBX:
0000000000005331 RCX: 0000000000000000
Jan 23 11:49:29 dev1 kernel: [ 281.022447] RDX: 0000000000005331 RSI:
000000000000101d RDI: ffff880423649380
Jan 23 11:49:29 dev1 kernel: [ 281.024502] RBP: ffff8803fbc3de68 R08:
0000000000005331 R09: 000000000000101d
Jan 23 11:49:29 dev1 kernel: [ 281.026563] R10: 00007fff9286b990 R11:
0000000000000246 R12: 00000000ffffffe7
Jan 23 11:49:29 dev1 kernel: [ 281.028628] R13: 0000000000000000 R14:
ffff8804236496c0 R15: ffff880420abd800
Jan 23 11:49:29 dev1 kernel: [ 281.030698] FS:
00007f62be453760(0000) GS:ffff88043f500000(0000)
knlGS:0000000000000000
Jan 23 11:49:29 dev1 kernel: [ 281.032772] CS: 0010 DS: 0000 ES:
0000 CR0: 0000000080050033
Jan 23 11:49:29 dev1 kernel: [ 281.034832] CR2: 0000000000000000 CR3:
00000003fa2da000 CR4: 00000000000406e0
Jan 23 11:49:29 dev1 kernel: [ 281.036908] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Jan 23 11:49:29 dev1 kernel: [ 281.038972] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Jan 23 11:49:29 dev1 kernel: [ 281.041019] Process blkid (pid: 4152,
threadinfo ffff8803fbc3c000, task ffff8803faa18000)
Jan 23 11:49:29 dev1 kernel: [ 281.043083] Stack:
Jan 23 11:49:29 dev1 kernel: [ 281.045138] ffffffff8141fa0f
ffff8803fbc3dec8 ffffffff812f5110 0000000000000000
Jan 23 11:49:29 dev1 kernel: [ 281.047243] ffff8804236496c0
0000000000000000 000000004f1d4903 00000000329f0436
Jan 23 11:49:29 dev1 kernel: [ 281.049312] 0000000000000003
ffff8804217ad3c0 ffff880404ae0a50 0000000000000000
Jan 23 11:49:29 dev1 kernel: [ 281.051352] Call Trace:
Jan 23 11:49:29 dev1 kernel: [ 281.053334] [<ffffffff8141fa0f>] ?
ioctl_dev+0x2f/0x40
Jan 23 11:49:29 dev1 kernel: [ 281.055284] [<ffffffff812f5110>]
blkdev_ioctl+0x2e0/0x740
Jan 23 11:49:29 dev1 kernel: [ 281.057191] [<ffffffff811acf10>]
block_ioctl+0x40/0x50
Jan 23 11:49:29 dev1 kernel: [ 281.059056] [<ffffffff8118843a>]
do_vfs_ioctl+0x8a/0x340
Jan 23 11:49:29 dev1 kernel: [ 281.060888] [<ffffffff8117b2ea>] ?
sys_newfstat+0x2a/0x40
Jan 23 11:49:29 dev1 kernel: [ 281.062687] [<ffffffff81188781>]
sys_ioctl+0x91/0xa0
Jan 23 11:49:29 dev1 kernel: [ 281.064478] [<ffffffff81678ec2>]
system_call_fastpath+0x16/0x1b
Jan 23 11:49:29 dev1 kernel: [ 281.066259] Code: Bad RIP value.
Jan 23 11:49:29 dev1 kernel: [ 281.068035] RIP [< (null)>]
(null)
Jan 23 11:49:29 dev1 kernel: [ 281.069812] RSP <ffff8803fbc3de60>
Jan 23 11:49:29 dev1 kernel: [ 281.071573] CR2: 0000000000000000
Jan 23 11:49:29 dev1 kernel: [ 281.073342] ---[ end trace 644c98d7f838705d ]---
On 21 January 2012 08:15, Kent Overstreet <koverstreet@xxxxxxxxxx> wrote:
> just tracked down a bug I was seeing when I was testing bcache on arm.
>
> Turns out whoever wrote bio_get_nr_vecs() never heard of integer overflow.
>
> But I bet it's the same bug you were seeing, and there's a trivial
> workaround in bcache.
>
> Patch will be up momentarily.
>
> On Fri, Jan 20, 2012 at 6:43 PM, Kent Overstreet
> <kent.overstreet@xxxxxxxxx> wrote:
>> Have you tried the bcache (3.1 based) branch with the same setup? Did
>> it occur there?
>>
>> On Fri, Jan 20, 2012 at 3:27 AM, Damien Churchill <damoxc@xxxxxxxxx> wrote:
>>> Hi there,
>>>
>>> I'm receiving the following after attempting to register a cache
>>> device, I've built the kernel using the Ubuntu Precise kernel with a
>>> patch from bcache-3.2-dev applied to the tree.
>>>
>>> The cache device was created by running:
>>> $ make-bcache -C -w 2k -b 1M /dev/sysvg/bcache-test
>>>
>>> The cache device is a logical volume, I'm unsure if that will have an impact?
>>>
>>> Regards,
>>> Damien
>>>
>>> Jan 20 11:24:36 dev1 kernel: [ 119.025724] bio: create slab <bio-1> at 1
>>> Jan 20 11:24:36 dev1 kernel: [ 119.025902] bcache: invalidating existing data
>>> Jan 20 11:24:36 dev1 kernel: [ 119.026324] ------------[ cut here ]------------
>>> Jan 20 11:24:36 dev1 kernel: [ 119.026341] kernel BUG at
>>> /home/dchurchill/Packages/oneiric/linux/linux-3.2.0~bcache/include/linux/scatterlist.h:63!
>>> Jan 20 11:24:36 dev1 kernel: [ 119.026367] invalid opcode: 0000 [#1] SMP
>>> Jan 20 11:24:36 dev1 kernel: [ 119.026380] CPU 0
>>> Jan 20 11:24:36 dev1 kernel: [ 119.026385] Modules linked in: rfcomm
>>> bnep bluetooth ip6table_filter ip6_tables ebtable_nat ebtables
>>> ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
>>> xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp
>>> iptable_filter ip_tables x_tables kvm_intel kvm parport_pc ppdev
>>> snd_hda_codec_hdmi snd_hda_codec_realtek binfmt_misc bridge usbhid hid
>>> psmouse snd_hda_intel stp snd_hda_codec snd_hwdep snd_pcm snd_seq_midi
>>> eeepc_wmi asus_wmi sparse_keymap radeon ttm drm_kms_helper drm wmi
>>> mac_hid serio_raw video snd_rawmidi snd_seq_midi_event mei(C) snd_seq
>>> snd_timer snd_seq_device snd i2c_algo_bit soundcore dm_multipath
>>> snd_page_alloc rbd libceph lp parport firewire_ohci firewire_core
>>> crc_itu_t e1000e pata_marvell r8169 btrfs zlib_deflate libcrc32c
>>> Jan 20 11:24:36 dev1 kernel: [ 119.026612]
>>> Jan 20 11:24:36 dev1 kernel: [ 119.026617] Pid: 2420, comm: bash
>>> Tainted: G C 3.2.0-9-generic #17~oneiric1 System
>>> manufacturer System Product Name/P8H67-M EVO
>>> Jan 20 11:24:36 dev1 kernel: [ 119.026649] RIP:
>>> 0010:[<ffffffff812f3588>] [<ffffffff812f3588>]
>>> blk_rq_map_sg+0x178/0x350
>>> Jan 20 11:24:36 dev1 kernel: [ 119.027607] RSP: 0018:ffff880420fbf7c8
>>> EFLAGS: 00010002
>>> Jan 20 11:24:36 dev1 kernel: [ 119.028564] RAX: 0000000000000000 RBX:
>>> ffff8803fa608a20 RCX: 2700013524000135
>>> Jan 20 11:24:36 dev1 kernel: [ 119.029529] RDX: 0000000000000011 RSI:
>>> 0000000027000135 RDI: ffff8803fa608a00
>>> Jan 20 11:24:36 dev1 kernel: [ 119.030492] RBP: ffff880420fbf828 R08:
>>> 0000000000001000 R09: ffff880421862f00
>>> Jan 20 11:24:36 dev1 kernel: [ 119.031455] R10: 0000000000000001 R11:
>>> 0000000000000001 R12: ffff8803fa60a510
>>> Jan 20 11:24:36 dev1 kernel: [ 119.032417] R13: 0000000027000135 R14:
>>> ffff8803fa60a520 R15: 00000000000000d3
>>> Jan 20 11:24:36 dev1 kernel: [ 119.033385] FS:
>>> 00007f5259391720(0000) GS:ffff88043f400000(0000)
>>> knlGS:0000000000000000
>>> Jan 20 11:24:36 dev1 kernel: [ 119.034361] CS: 0010 DS: 0000 ES:
>>> 0000 CR0: 000000008005003b
>>> Jan 20 11:24:36 dev1 kernel: [ 119.035336] CR2: 00007f6d332e8000 CR3:
>>> 0000000401c16000 CR4: 00000000000406f0
>>> Jan 20 11:24:36 dev1 kernel: [ 119.036310] DR0: 0000000000000000 DR1:
>>> 0000000000000000 DR2: 0000000000000000
>>> Jan 20 11:24:36 dev1 kernel: [ 119.037287] DR3: 0000000000000000 DR6:
>>> 00000000ffff0ff0 DR7: 0000000000000400
>>> Jan 20 11:24:36 dev1 kernel: [ 119.038266] Process bash (pid: 2420,
>>> threadinfo ffff880420fbe000, task ffff880403b3dc40)
>>> Jan 20 11:24:36 dev1 kernel: [ 119.039252] Stack:
>>> Jan 20 11:24:36 dev1 kernel: [ 119.040220] 0000000000000011
>>> ffff880400fcd2b0 ffff8803fa608800 0100000000000001
>>> Jan 20 11:24:36 dev1 kernel: [ 119.041196] ffff8804213a3368
>>> ffff880421862f00 ffff880420fbf828 ffff8804209cb858
>>> Jan 20 11:24:36 dev1 kernel: [ 119.042171] ffff880400fcd2b0
>>> 0000000000000001 0000000000000020 ffff880424e96800
>>> Jan 20 11:24:36 dev1 kernel: [ 119.043130] Call Trace:
>>> Jan 20 11:24:36 dev1 kernel: [ 119.044070] [<ffffffff81442521>]
>>> scsi_init_sgtable+0x41/0x70
>>> Jan 20 11:24:36 dev1 kernel: [ 119.045036] [<ffffffff8144258d>]
>>> scsi_init_io+0x3d/0x150
>>> Jan 20 11:24:36 dev1 kernel: [ 119.045983] [<ffffffff8144279a>]
>>> scsi_setup_fs_cmnd.part.34+0x5a/0x90
>>> Jan 20 11:24:36 dev1 kernel: [ 119.046917] [<ffffffff814427ff>]
>>> scsi_setup_fs_cmnd+0x2f/0x40
>>> Jan 20 11:24:36 dev1 kernel: [ 119.047837] [<ffffffff8145fb3f>]
>>> sd_prep_fn+0xaf/0xaf0
>>> Jan 20 11:24:36 dev1 kernel: [ 119.048747] [<ffffffff813017f4>] ?
>>> cfq_dispatch_request+0x64/0xa0
>>> Jan 20 11:24:36 dev1 kernel: [ 119.049654] [<ffffffff812eecda>]
>>> blk_peek_request+0xba/0x240
>>> Jan 20 11:24:36 dev1 kernel: [ 119.050558] [<ffffffff81442cf8>]
>>> scsi_request_fn+0x58/0x4c0
>>> Jan 20 11:24:36 dev1 kernel: [ 119.051461] [<ffffffff812e7c73>] ?
>>> __elv_add_request+0x1b3/0x290
>>> Jan 20 11:24:36 dev1 kernel: [ 119.052361] [<ffffffff812ef590>]
>>> blk_queue_bio+0x290/0x380
>>> Jan 20 11:24:36 dev1 kernel: [ 119.053262] [<ffffffff812ec114>]
>>> generic_make_request.part.50+0x74/0xb0
>>> Jan 20 11:24:36 dev1 kernel: [ 119.054170] [<ffffffff812ec528>]
>>> generic_make_request+0x68/0x70
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