here is solution:
run mkswap with "-c"
mkswap -c /dev/zram0
(you can fix this in package zram-config, if you want :)
cat /etc/init/zram-config.conf | grep mkswap
mkswap /dev/zram${DEVNUMBER}
you need to change this line to:
mkswap -c /dev/zram${DEVNUMBER}
Explanation:
See:
modprobe zram zram_num_devices=1
( dmesg | grep zram ) :
[ 979.545213] zram: module is from the staging directory, the quality is
unknown, you have been warned.
[ 979.550810] zram: Creating 1 devices ...
Next:
echo $((345*1024*1024)) > /sys/block/zram0/disksize
(dmesg still silent....)
Next:
mkswap /dev/zram0
Setting up swapspace version 1, size = 353276 KiB
no label, UUID=a95522e0-fb27-4dce-8006-3e3cbf9a6f75
(dmesg:)
[ 1115.120823] Buffer I/O error on device zram0, logical block 88319
[ 1115.120838] Buffer I/O error on device zram0, logical block 88319
[ 1115.121111] Buffer I/O error on device zram0, logical block 88319
[ 1115.121145] Buffer I/O error on device zram0, logical block 88319
[ 1115.121166] Buffer I/O error on device zram0, logical block 88319
[ 1115.121191] Buffer I/O error on device zram0, logical block 88319
[ 1115.121212] Buffer I/O error on device zram0, logical block 88319
[ 1115.121347] Buffer I/O error on device zram0, logical block 88319
[ 1115.121376] Buffer I/O error on device zram0, logical block 88319
[ 1115.121431] Buffer I/O error on device zram0, logical block 88319
[ 1127.081652] Buffer I/O error on device zram0, logical block 88319
[ 1127.081671] Buffer I/O error on device zram0, logical block 88319
[ 1127.081952] Buffer I/O error on device zram0, logical block 88319
[ 1127.081987] Buffer I/O error on device zram0, logical block 88319
[ 1127.082007] Buffer I/O error on device zram0, logical block 88319
[ 1127.082028] Buffer I/O error on device zram0, logical block 88319
[ 1127.082046] Buffer I/O error on device zram0, logical block 88319
[ 1127.082183] Buffer I/O error on device zram0, logical block 88319
[ 1127.082211] Buffer I/O error on device zram0, logical block 88319
[ 1127.082265] Buffer I/O error on device zram0, logical block 88319
See! "logical block 88319"! 88319 * 4096 = 361754624; error on bite
number 361754624 (one block = 4096 bites)
I was create 361758720 bites (echo $((345*1024*1024)) returns 361758720;
3617858720 (memory, for zram) - 361754624 (number of bite with error ) =
4096!
Zram create device, with damaged last sector!
How to solve it?
mkswap --help:
....
-c, --check check bad blocks before creating the swap area
mkswap -c /dev/zram0
one bad page
Setting up swapspace version 1, size = 353272 KiB
no label, UUID=bb7a0771-5f00-47b0-9238-723b8cd61b20
Yes, one bad page!
(you can see difference in size; - without "-c" option "size = 353276 KiB",
with it - succesfully find "one bad page", and size is 4 KB less:
size = 353272 KiB
....
swapon /dev/zram0 -p 10
and, dmesg:
1546.782347] Buffer I/O error on device zram0, logical block 88319
[ 1546.782369] Buffer I/O error on device zram0, logical block 88319
[ 1546.782500] Buffer I/O error on device zram0, logical block 88319
....
You can see, time(in beginning of "dmesg"): time not when you run
"swapon", time = time when "mkswap" check partition"; so, your "swap" is
safe and stable!
Enjoy!
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1215513
Title:
System locks up, requires hard reset
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Precise:
Fix Committed
Status in “linux” source package in Quantal:
Fix Committed
Status in “linux” source package in Raring:
Fix Committed
Status in “linux” source package in Saucy:
Fix Released
Bug description:
Since I started using 3.8.0-29 I experienced system lock ups at random
times. First one was while running Virtualbox (windows guest) but
later have been without virtualbox running for example while shutting
down or while reading a webpage.
I could not find any relevant log, but I'd post any log file
considered useful.
This has hapened in 2 different machines (the one im reporting from is
intel with intel graphics and the other is AMD with radeon graphics).
Both 64 bits.
Up until 3.8.0-27 inclusive I had not had a lockup in years in any of
those machines. I have been running Ubuntu 64 bit since at least 2008
in one of them.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-29-generic 3.8.0-29.42
ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
Uname: Linux 3.8.0-29-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: fede 1829 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
CurrentDmesg:
Date: Thu Aug 22 12:49:35 2013
HibernationDevice: RESUME=UUID=ee5b2280-eed3-41e2-8675-103fbdd703d1
InstallationDate: Installed on 2012-12-03 (261 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-generic
root=UUID=0d34a8a5-2002-47e8-9128-a35623612ec1 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-29-generic N/A
linux-backports-modules-3.8.0-29-generic N/A
linux-firmware 1.106
RfKill:
SourcePackage: linux
StagingDrivers: zram
UpgradeStatus: Upgraded to raring on 2013-04-25 (118 days ago)
dmi.bios.date: 09/11/2006
dmi.bios.vendor: Intel Corp.
dmi.bios.version: TS94610J.86A.0047.2006.0911.0110
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: D946GZIS
dmi.board.vendor: Intel Corporation
dmi.board.version: AAD66165-501
dmi.chassis.type: 2
dmi.modalias:
dmi:bvnIntelCorp.:bvrTS94610J.86A.0047.2006.0911.0110:bd09/11/2006:svn:pn:pvr:rvnIntelCorporation:rnD946GZIS:rvrAAD66165-501:cvn:ct2:cvr:
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