** Branch linked: lp:ubuntu/trusty-proposed/linux-keystone
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https://bugs.launchpad.net/bugs/1357295
Title:
bcache_writebac blocks and goes silent on trusty kernel
3.13.0-24-generic #47-Ubuntu
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Trusty:
Fix Committed
Status in “linux” source package in Utopic:
Fix Released
Bug description:
We regularly use bcache to use SSDs as an extra block cache layer for
performance on large working sets (archive mirrors, large databases,
etc). Until now we have had good success with bcache on precise LTS
with HWE kernels up to Saucy's.
Unfortunately when we mount a bcache-backed volume on a Trusty server,
it immediately loses contact with bcache_writebac:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
501 root 20 0 0 0 0 D 0.0 0.0 0:00.00
bcache_writebac
kern.log shows it losing its mind pretty much immediately on startup:
Aug 12 02:22:15 somehostname kernel: [ 6483.477618] md: bind<sdc>
Aug 12 02:22:15 somehostname kernel: [ 6483.478599] md: bind<sdd>
Aug 12 02:22:15 somehostname kernel: [ 6483.482016] md/raid0:md0: md_size
is 781443072 sectors.
Aug 12 02:22:15 somehostname kernel: [ 6483.482024] md: RAID0
configuration for md0 - 1 zone
Aug 12 02:22:15 somehostname kernel: [ 6483.482026] md: zone0=[sdc/sdd]
Aug 12 02:22:15 somehostname kernel: [ 6483.482033] zone-offset=
0KB, device-offset= 0KB, size= 390721536KB
Aug 12 02:22:15 somehostname kernel: [ 6483.482036]
Aug 12 02:22:15 somehostname kernel: [ 6483.482055] md0: detected
capacity change from 0 to 400098852864
Aug 12 02:22:15 somehostname kernel: [ 6483.487644] md0: unknown
partition table
Aug 12 02:26:55 somehostname kernel: [ 6763.657249] bio: create slab
<bio-2> at 2
Aug 12 02:26:55 somehostname kernel: [ 6763.658018] bcache:
run_cache_set() invalidating existing data
Aug 12 02:26:55 somehostname kernel: [ 6763.695447] bcache:
register_cache() registered cache device md0
Aug 12 02:26:55 somehostname kernel: [ 6763.696262] bcache:
register_bdev() registered backing device sdb
Aug 12 02:26:55 somehostname kernel: [ 6763.697833] bcache:
bch_cached_dev_attach() Caching sdb as bcache0 on set
13dcf71e-73ea-49f7-8cd6-fb8182c3cc17
Aug 12 02:27:24 somehostname kernel: [ 6793.114287] EXT4-fs (bcache0):
mounted filesystem with ordered data mode. Opts: (null)
Aug 12 02:30:16 somehostname kernel: [ 6964.514425] INFO: task
bcache_writebac:29721 blocked for more than 120 seconds.
Aug 12 02:30:16 somehostname kernel: [ 6964.608861] Not tainted
3.13.0-24-generic #47-Ubuntu
Aug 12 02:30:16 somehostname kernel: [ 6964.679403] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Aug 12 02:30:16 somehostname kernel: [ 6964.779270] bcache_writebac D
ffff8817dfb34440 0 29721 2 0x00000000
Aug 12 02:30:16 somehostname kernel: [ 6964.779278] ffff882fafe57eb8
0000000000000002 ffff882fb100afe0 ffff882fafe57fd8
Aug 12 02:30:16 somehostname kernel: [ 6964.779286] 0000000000014440
0000000000014440 ffff882fb100afe0 ffff882fb7bcac80
Aug 12 02:30:16 somehostname kernel: [ 6964.779293] ffff882fb11c0000
ffffffffa03f5840 0000000000000000 0000000000000000
Aug 12 02:30:16 somehostname kernel: [ 6964.779301] Call Trace:
Aug 12 02:30:16 somehostname kernel: [ 6964.779335] [<ffffffffa03f5840>]
? read_dirty+0x400/0x400 [bcache]
Aug 12 02:30:16 somehostname kernel: [ 6964.779346] [<ffffffff81719ee9>]
schedule+0x29/0x70
Aug 12 02:30:16 somehostname kernel: [ 6964.779356] [<ffffffff8108b2ed>]
kthread+0xad/0xf0
Aug 12 02:30:16 somehostname kernel: [ 6964.779368] [<ffffffff8108b240>]
? kthread_create_on_node+0x1d0/0x1d0
Aug 12 02:30:16 somehostname kernel: [ 6964.779379] [<ffffffff817263fc>]
ret_from_fork+0x7c/0xb0
Aug 12 02:30:16 somehostname kernel: [ 6964.779385] [<ffffffff8108b240>]
? kthread_create_on_node+0x1d0/0x1d0
Aug 12 02:32:16 somehostname kernel: [ 7084.828482] INFO: task
bcache_writebac:29721 blocked for more than 120 seconds.
Aug 12 02:32:16 somehostname kernel: [ 7084.922987] Not tainted
3.13.0-24-generic #47-Ubuntu
Aug 12 02:32:16 somehostname kernel: [ 7084.993239] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Aug 12 02:32:16 somehostname kernel: [ 7085.093858] bcache_writebac D
ffff8817dfb34440 0 29721 2 0x00000000
Aug 12 02:32:16 somehostname kernel: [ 7085.093866] ffff882fafe57eb8
0000000000000002 ffff882fb100afe0 ffff882fafe57fd8
Aug 12 02:32:16 somehostname kernel: [ 7085.093874] 0000000000014440
0000000000014440 ffff882fb100afe0 ffff882fb7bcac80
Aug 12 02:32:16 somehostname kernel: [ 7085.093881] ffff882fb11c0000
ffffffffa03f5840 0000000000000000 0000000000000000
Aug 12 02:32:16 somehostname kernel: [ 7085.093897] Call Trace:
Aug 12 02:32:16 somehostname kernel: [ 7085.093918] [<ffffffffa03f5840>]
? read_dirty+0x400/0x400 [bcache]
Aug 12 02:32:16 somehostname kernel: [ 7085.093928] [<ffffffff81719ee9>]
schedule+0x29/0x70
Aug 12 02:32:16 somehostname kernel: [ 7085.093944] [<ffffffff8108b2ed>]
kthread+0xad/0xf0
Aug 12 02:32:16 somehostname kernel: [ 7085.093950] [<ffffffff8108b240>]
? kthread_create_on_node+0x1d0/0x1d0
Aug 12 02:32:16 somehostname kernel: [ 7085.093959] [<ffffffff817263fc>]
ret_from_fork+0x7c/0xb0
Aug 12 02:32:16 somehostname kernel: [ 7085.093964] [<ffffffff8108b240>]
? kthread_create_on_node+0x1d0/0x1d0
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-33-generic 3.13.0-33.58
ProcVersionSignature: Ubuntu 3.13.0-33.58-generic 3.13.11.4
Uname: Linux 3.13.0-33-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: nick 2424 F.... pulseaudio
/dev/snd/controlC0: nick 2424 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Aug 15 11:08:19 2014
HibernationDevice: RESUME=UUID=dae1fd50-2dc0-48b2-bd93-5823478772b6
InstallationDate: Installed on 2014-05-29 (77 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO 20ALCTO1WW
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-33-generic.efi.signed
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-33-generic N/A
linux-backports-modules-3.13.0-33-generic N/A
linux-firmware 1.127.5
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/06/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GIET69WW (2.19 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20ALCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: 0B98405 STD
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvrGIET69WW(2.19):bd02/06/2014:svnLENOVO:pn20ALCTO1WW:pvrThinkPadX240:rvnLENOVO:rn20ALCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20ALCTO1WW
dmi.product.version: ThinkPad X240
dmi.sys.vendor: LENOVO
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