*** This bug is a duplicate of bug 1215513 ***
https://bugs.launchpad.net/bugs/1215513
Damian, the "fdisk /dev/ram0" was a typo, because I was NOT in any
condition to do "copy/paste" from the system, undergoing the zram0
issue. My actual number is different : 314224, but my "situation" is
the same, because the number in the "Buffer I/O Error message" was
314223.
Everyone,
This is NOT just a "asthetic" issue under Ubuntu 12.0.4 LTS as, when I
examined my RAM situation, while "fdisk /dev/zram0" gave me "number of
sectors", I have less RAM, causing a Significant performance
degregation, and MUCH thrashing, as my system over-used the poor "Type
82 SWAP Partition" on the same hard drive as all the other files.
PLEASE re-open this, as an ACTUAL problem, not a duplicate, as I see the
"steam roller" effect on issue #1215513, where they appear set to
"close" that problem as "fixed, but with an 'ugly' message". If any of
the technicions (spelling?) are also on that other issue, PLEASE pass
along that ONLY fixing the freeze can adversely affect system
performance, at least on some of the Ubuntu Releases.
I though the LTS [12.0.4] release was supposed to be "stable". Like I
said in a prior message, I'm "supposed" to be a "big picture manager"
who just happens to administer a "semi-production" system. I "happily
jump" into "detailed debug" mode, when needed, but am "spread thin".
When I was doing things like you do, the "state of the art" release was
Red Hat 6! :-O
Now that I've "dated myself" [premature Senior Citizen], I sincerely
hope this issue gets the "fantastic customer support" I used to get,
when I could phone the developers and "brainstorm" solutions. I met
Linus Torvalds at a San Francisco Linux conference once, but don't
remember the year. He was very gracious back then. I hope you all
still maintain social skills.
Thank you and best regards,
Kenneth Parker, Seattle, WA
-- I'm a troubleshooter. I look for trouble, and shoot it!
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1217189
Title:
Buffer I/O error on device zram0 (possibly causing complete machine
lockup)
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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