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Message #19710
Re: [Bug 1217189] Re: Buffer I/O error on device zram0
Hence why I said I/O errors on *write*. If the block dev layer reports
an error to the VM on page-out, it knows the data hasn't been correctly
written.
I'm not sure zram actually allocates the whole amount of memory it's
configured to use, initially:
steved@xubuntu:~$ free
total used free shared buffers cached
Mem: 2050796 1473456 577340 0 254232 696144
-/+ buffers/cache: 523080 1527716
Swap: 2975088 20848 2954240
steved@xubuntu:~$ swapon -s
Filename Type Size Used Priority
/dev/zram0 partition 1025396 20848 100
/dev/mapper/lvg2-swap partition 1949692 0 -1
At the very least, free seems to know it's cache memory. Don't know
whether that's merely a presentation thing, need to look at the code.
Anyway, the SNR here is getting awful, and I don't want to contribute to
it. Anyone who wants to can contact me privately via LP.
S.
On Fri, Oct 04, 2013 at 03:28:18PM -0000, Kenneth Parker wrote:
> Mel, the reason I do NOT believe this is a duplicate of # 1215513 is
> that many get error messages (including I/O errors in some cases)
> WITHOUT a hang. But any time I see I/O error on any disk, whether
> "hardware, ram or simulated [i.e. network]", there's a chance of data
> corruption, even without crashes. Please reconsider.
>
> Steve, you also mention I/O error messages. Once again, that could
> corrupt data, the WORST TYPE of error, in my NOT SO humble opinion.
> (Think about it: If SWAP data comes back in, and your "bank balance"
> changes from 5000 to 500,000, you might THINK you have more in your
> account than you do, causing "mishaps" in International Finance.
> [Example used, due to how badly your life could be hurt].
>
> My personal solution is to come up with ONLY a Root Text console [yes,
> Ubuntu users aren't SUPPOSED to become "real Root", but I've been doing
> this sort of thing since the 1990's], "rmmod zram" [with prejudice, if
> possible], and I'm prepared to do a "permanent rename" of the correct
> name of the module, as soon as I "get around" to it. [Visions of Round
> Tuits...]
>
> A point I made earlier: Even if a SWAP partition is NOT made out of
> /dev/zram0, part of RAM is being "reserved for nothing".
>
> Thank you and best regards,
>
> Kenneth Parker, Seattle, WA
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1217189
>
> Title:
> Buffer I/O error on device zram0
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1217189/+subscriptions
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https://bugs.launchpad.net/bugs/1217189
Title:
Buffer I/O error on device zram0
Status in “linux” package in Ubuntu:
Confirmed
Status in “linux-lts-raring” package in Ubuntu:
Confirmed
Bug description:
This is on linux-image-generic-lts-raring (which I recently upgraded
to 3.8.0-29; the problem didn't occur before upgrading AFAIR)
I see this junk in my dmesg when creating / formatting a zram swap,
and then periodically. Then at some point after heavy swapping
incidents, the machine locks up. "Correlation does not imply
causation, but it does waggle its eyebrows suggestively" and all that.
---
zram: module is from the staging directory, the quality is unknown, you have been warned.
zram: num_devices not specified. Using default: 1
zram: Creating 1 devices
Adding 1031648k swap on /dev/zram0. Priority:100 extents:1 across:1031648k SS
...
Buffer I/O error on device zram0, logical block 257912 [repeated 10 times]
...
BUG: scheduling while atomic: rsyslogd/1439/0x00000001
Pid: 1439, comm: rsyslogd Tainted: PF WC O 3.8.0-29-generic #42~precise1-Ubuntu
[20931.796635] Pid: 1439, comm: rsyslogd Tainted: PF WC O 3.8.0-29-generic #42~precise1-Ubuntu
[20931.796638] Call Trace:
[20931.796649] [<c1619449>] __schedule_bug+0x52/0x5e
[20931.796653] [<c162c265>] __schedule+0x575/0x5f0
[20931.796660] [<f8439e06>] ? zram_make_request+0xe6/0x100 [zram]
[20931.796666] [<c111c38d>] ? release_pages+0x18d/0x1c0
[20931.796669] [<c162c573>] schedule+0x23/0x60
[20931.796673] [<c162d0fd>] rwsem_down_failed_common+0x9d/0xf0
[20931.796677] [<c162d162>] rwsem_down_write_failed+0x12/0x20
[20931.796681] [<c12f809a>] call_rwsem_down_write_failed+0x6/0x8
[20931.796685] [<c162ba44>] ? down_write+0x24/0x30
[20931.796689] [<f8439169>] zram_slot_free_notify+0x29/0x50 [zram]
[20931.796693] [<f8439140>] ? zram_stat64_inc+0x30/0x30 [zram]
[20931.796700] [<c11460bc>] swap_entry_free+0xdc/0x170
[20931.796703] [<c162d100>] ? rwsem_down_failed_common+0xa0/0xf0
[20931.796708] [<c1146458>] swap_free+0x28/0x40
[20931.796712] [<c1134ba0>] do_swap_page+0x390/0x6f0
[20931.796717] [<c10180f8>] ? sched_clock+0x8/0x10
[20931.796721] [<c11365aa>] handle_pte_fault+0x21a/0x2b0
[20931.796726] [<c10451e1>] ? kmap_atomic_prot+0xf1/0x120
[20931.796730] [<c113746a>] handle_mm_fault+0x1fa/0x2d0
[20931.796735] [<c1630ad0>] __do_page_fault+0x190/0x4f0
[20931.796740] [<c12f63bc>] ? sprintf+0x1c/0x20
[20931.796744] [<c104c132>] ? print_time.part.4+0x82/0xc0
[20931.796748] [<c1630e30>] ? __do_page_fault+0x4f0/0x4f0
[20931.796752] [<c1630e3d>] do_page_fault+0xd/0x10
[20931.796756] [<c162dc17>] error_code+0x67/0x6c
[20931.796759] [<c12f8716>] ? __copy_to_user_ll+0x46/0x70
[20931.796763] [<c12f8970>] copy_to_user+0x40/0x60
[20931.796767] [<c104e218>] syslog_print+0xc8/0x210
[20931.796770] [<c104eae6>] do_syslog+0x206/0x390
[20931.796775] [<c106d570>] ? add_wait_queue+0x50/0x50
[20931.796780] [<c11c3680>] ? kmsg_poll+0x50/0x50
[20931.796784] [<c11c36d0>] kmsg_read+0x50/0x60
[20931.796788] [<c11b6584>] proc_reg_read+0x64/0xa0
[20931.796793] [<c116469c>] vfs_read+0x8c/0x160
[20931.796797] [<c10a898d>] ? sys_futex+0xed/0x130
[20931.796801] [<c11b6520>] ? proc_reg_write+0xa0/0xa0
[20931.796805] [<c11647b7>] sys_read+0x47/0x80
...
[30855.181542] Write-error on swap-device (251:0:131064)
[43457.030155] Write-error on swap-device (251:0:131064)
[43705.090381] Buffer I/O error on device zram0, logical block 16383
Anyway, there's a couple of lkml messages related to this "Buffer I/O
error on device zram0", please investigate
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.8.0-29-generic 3.8.0-29.42~precise1
ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
Uname: Linux 3.8.0-29-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: i386
Date: Tue Aug 27 07:33:37 2013
EcryptfsInUse: Yes
MarkForUpload: True
ProcEnviron:
TERM=rxvt
LC_COLLATE=C
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-lts-raring
UpgradeStatus: No upgrade log present (probably fresh install)
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-29-lowlatency.
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: muresan 29305 F.... pulseaudio
/dev/snd/pcmC0D0p: muresan 29305 F...m pulseaudio
/dev/snd/controlC1: muresan 29305 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 44'
Mixer name : 'SigmaTel STAC9205'
Components : 'HDA:838476a0,102801f1,00100204 HDA:14f12c06,14f1000f,00100000'
Controls : 26
Simple ctrls : 12
Card1.Amixer.info:
Card hw:1 'USB'/'E-MU Systems, Inc. E-MU 0202 | USB at usb-0000:00:1d.0-2, full speed'
Mixer name : 'USB Mixer'
Components : 'USB041e:3f02'
Controls : 4
Simple ctrls : 2
DistroRelease: Ubuntu 12.04
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=88836c66-16ea-407f-8753-3190c09ca82f
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
MachineType: Dell Inc. Inspiron 1520
MarkForUpload: True
NonfreeKernelModules: nvidia
Package: linux-lts-raring
ProcEnviron:
TERM=rxvt
LC_COLLATE=C
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-lowlatency root=UUID=a7047dd8-61aa-4cbe-b36d-697a5e7ee64b ro
ProcVersionSignature: Ubuntu 3.8.0-29.21-lowlatency 3.8.13.5
RelatedPackageVersions:
linux-restricted-modules-3.8.0-29-lowlatency N/A
linux-backports-modules-3.8.0-29-lowlatency N/A
linux-firmware 1.79.6
RfKill:
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
StagingDrivers: zram
Tags: precise staging
Uname: Linux 3.8.0-29-lowlatency i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin audio cdrom davfs2 dialout dip floppy fuse lpadmin netdev plugdev powerdev sambashare scanner video
dmi.bios.date: 02/03/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0UW306
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd02/03/2008:svnDellInc.:pnInspiron1520:pvr:rvnDellInc.:rn0UW306:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1520
dmi.sys.vendor: Dell Inc.
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References