*** This bug is a duplicate of bug 1215513 ***
https://bugs.launchpad.net/bugs/1215513
I STRONGLY suggest that this is NOT a duplicate of bug #1215513, as a
fix was distributed that fixes the "System Locks Up" part, but leaves
this error message.
In my first comment, both on this Bug and on Bug #1215513, I responded
to the error message by entering "fdisk /dev/ram0", under root, followed
by "p", which showed it to never be partitioned, or anything (like a
SWAP partition being defined). So it LOOKS like I was never in danger of
bug #1215513, but only experiencing the messages, noted in this Bug
(#1217189). Even though no "actual harm" is done, through a "pure
experience" of Bug # 1217189, the error messages still appear, after
"fix" of #1215513, which can CERTAINLY alarm production Linux
administrators anywhere, and cause loss of money in any case where the
Server is anything but something assisting non-profit volunteer work,
where they can be told they need to be patient and wait for their
services. (Actually, due to an early message by dac922, I was able to
disable zram services on a system that has no intention of using them).
Obviously, what happened was that the Kernel 3.8 work, IMPLEMENTING
zram0 swap was "back-ported" to the 3.2 Kernel tree, somewhere <=
vmlinuz-3.2.0-53-generic-pae!!! :-O
Remember, my system is Ubuntu 12.0.4 LTS Server, which, in my opinion is
not in any condition for "stray zram swap" creation! Fortunately,
somebody ported the package zram-config to 12.0.4, allowing me to get
it, which, in effect PERMANENTLY DISABLES the zram0 processes, because
they fail, during the install of zram-config, allowing "apt-get upgrade"
to state that it was not successful in the "install" of this package.
So I suggest that somebody on this forum, in either of these Bug reports
(again, I'm too busy administering Linux to normally submit fixes!) put
some of this text in some "FAQ file" somewhere,
Forgive my dry humor in this post. As a Linux admin, I'm trained to
"roll with the punches" and to consider the humor of life on Planet
Earth (and, forgive me for adding) the political system in the USA!!!
:-)
Thank you and best regards,
Kenneth Parker, Seattle, WA
-- I'm a Troubleshooter. I look for Trouble and Shoot It! :-)
--
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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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