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Kubuntu Natty Crashes at random

Asked by mebuntu

I've asked this on Ubuntuforums.org and haven't got any replies.
I've been running Kubuntu Natty for quite some time. I have also suffered with a fairly random crash where the computer just dies completely and restarts. There is no "crash report" dialogue, as you get with some software bugs in Kubuntu, the computer just died completely. I have looked through log files and also I've run memtest overnight, which does not indicate any errors.
I've tried overloading all four cpus; temperature went much higher than I've ever seen it normally - something like 80C and it didn't crash. So I don't think it's a temperature event.
I can't see anything in the event logs. But every so often I can be away from my desk and the machine's back at the login prompt (I don't use a screen saver) so it must have crashed and rebooted.

It would be helpful if someone could tell me how I might be able to narrow this down.

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Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#1

Does it happen as all users? Are there particular apps which make it crash?

Revision history for this message
mebuntu (salsa-temps) said : 		#2

I only ever log in as one user, there are no others. I can't identify a specific app that causes the crash. Normally I'm running google chrome, dolphin, firefox and not much else.

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#3

You can make thousands of users on your system so "there are no others" is a moot statement

Revision history for this message
mebuntu (salsa-temps) said : 		#4

I can leave it overnight, sometimes it will crash, sometimes not. Just thought about my answer, it ignores the fact that there's loads of stuff running in the background. Silly me. I'll leave it running overnight and see what happens.

Here's the output of ps -A:

  PID TTY TIME CMD
    1 ? 00:00:01 init
    2 ? 00:00:00 kthreadd
    3 ? 00:00:01 ksoftirqd/0
    6 ? 00:00:00 migration/0
    7 ? 00:00:00 migration/1
    9 ? 00:00:00 ksoftirqd/1
   11 ? 00:00:00 migration/2
   13 ? 00:00:00 ksoftirqd/2
   14 ? 00:00:00 migration/3
   16 ? 00:00:00 ksoftirqd/3
   17 ? 00:00:00 migration/4
   19 ? 00:00:00 ksoftirqd/4
   20 ? 00:00:00 migration/5
   22 ? 00:00:00 ksoftirqd/5
   23 ? 00:00:00 migration/6
   25 ? 00:00:00 ksoftirqd/6
   26 ? 00:00:00 migration/7
   27 ? 00:00:00 kworker/7:0
   28 ? 00:00:00 ksoftirqd/7
   29 ? 00:00:00 cpuset
   30 ? 00:00:00 khelper
   31 ? 00:00:00 netns
   33 ? 00:00:00 sync_supers
   34 ? 00:00:00 bdi-default
   35 ? 00:00:00 kintegrityd
   36 ? 00:00:00 kblockd
   37 ? 00:00:00 kacpid
   38 ? 00:00:00 kacpi_notify
   39 ? 00:00:00 kacpi_hotplug
   40 ? 00:00:00 ata_sff
   41 ? 00:00:00 khubd
   42 ? 00:00:00 md
   44 ? 00:00:00 khungtaskd
   45 ? 00:00:00 kswapd0
   46 ? 00:00:00 ksmd
   47 ? 00:00:00 fsnotify_mark
   48 ? 00:00:00 aio
   49 ? 00:00:00 ecryptfs-kthrea
   50 ? 00:00:00 crypto
   54 ? 00:00:00 kthrotld
   58 ? 00:00:00 kmpathd
   59 ? 00:00:00 kmpath_handlerd
   60 ? 00:00:00 kondemand
   61 ? 00:00:00 kconservative
  190 ? 00:00:00 scsi_eh_0
  191 ? 00:00:00 scsi_eh_1
  192 ? 00:00:00 scsi_eh_2
  193 ? 00:00:00 scsi_eh_3
  194 ? 00:00:00 scsi_eh_4
  195 ? 00:00:00 scsi_eh_5
  214 ? 00:00:00 scsi_eh_6
  215 ? 00:00:04 usb-storage
  217 ? 00:00:00 scsi_eh_7
  218 ? 00:00:02 usb-storage
  361 ? 00:00:00 jbd2/sda2-8
  362 ? 00:00:00 ext4-dio-unwrit
  419 ? 00:00:00 upstart-udev-br
  429 ? 00:00:00 udevd
  869 ? 00:00:00 upstart-socket-
  904 ? 00:00:00 iscsi_eh
  929 ? 00:00:00 hd-audio0
  939 ? 00:00:00 ib_addr
  941 ? 00:00:00 ib_mcast
  942 ? 00:00:00 iw_cm_wq
  944 ? 00:00:00 ib_cm
  945 ? 00:00:00 rdma_cm
  947 ? 00:00:00 iscsid
  948 ? 00:00:00 iscsid
  975 ? 00:00:00 scsi_eh_8
  976 ? 00:00:00 iscsi_q_8
  977 ? 00:00:00 scsi_wq_8
  993 ? 00:00:00 flush-8:0
 1006 ? 00:00:00 dhclient3
 1120 ? 00:00:00 kjournald
 1139 ? 00:00:00 smbd
 1148 ? 00:00:00 sshd
 1222 ? 00:00:00 rsyslogd
 1225 tty4 00:00:00 getty
 1229 tty5 00:00:00 getty
 1245 tty2 00:00:00 getty
 1246 tty3 00:00:00 getty
 1249 tty6 00:00:00 getty
 1256 ? 00:00:00 acpid
 1280 ? 00:00:01 mysqld
 1291 ? 00:00:00 winbindd
 1336 ? 00:00:00 cupsd
 1340 ? 00:00:00 atd
 1341 ? 00:00:00 cron
 1347 ? 00:00:00 kvm-irqfd-clean
 1390 ? 00:00:01 irqbalance
 1415 ? 00:00:00 libvirtd
 1419 ? 00:00:00 nmbd
 1424 ? 00:00:01 dbus-daemon
 1450 ? 00:00:00 kdm
 1456 ? 00:00:00 avahi-daemon
 1457 ? 00:00:00 avahi-daemon
 1491 ? 00:00:00 winbindd
 1502 tty7 00:01:38 Xorg
 1524 ? 00:00:00 winbindd
 1525 ? 00:00:00 NetworkManager
 1534 ? 00:00:00 apache2
 1565 ? 00:00:00 winbindd
 1567 ? 00:00:00 dnsmasq
 1570 ? 00:00:00 modem-manager
 1573 ? 00:00:00 polkitd
 1581 ? 00:00:00 smbd
 1620 ? 00:00:00 wpa_supplicant
 1654 ? 00:00:00 mediatomb
 1722 ? 00:00:00 kdm
 1727 ? 00:00:00 udevd
 1777 tty1 00:00:00 getty
 1785 ? 00:00:00 console-kit-dae
 1858 ? 00:00:00 x-session-manag
 1903 ? 00:00:00 ssh-agent
 1906 ? 00:00:00 dbus-launch
 1907 ? 00:00:01 dbus-daemon
 1938 ? 00:00:00 udisks-daemon
 1939 ? 00:00:03 udisks-daemon
 1966 ? 00:00:00 start_kdeinit
 1967 ? 00:00:00 kdeinit4
 1968 ? 00:00:00 klauncher
 1970 ? 00:00:00 kded4
 1976 ? 00:00:00 kglobalaccel
 1978 ? 00:00:00 kwalletd
 1981 ? 00:00:00 upowerd
 2070 ? 00:00:00 kwrapper4
 2071 ? 00:00:00 ksmserver
 2076 ? 00:00:01 kwin
 2078 ? 00:00:00 kactivitymanage
 2084 ? 00:02:59 knotify4
 2087 ? 00:00:08 plasma-desktop
 2093 ? 00:00:00 kuiserver
 2097 ? 00:00:00 ksysguardd
 2099 ? 00:00:00 akonadi_control
 2101 ? 00:00:00 akonadiserver
 2104 ? 00:00:01 mysqld
 2129 ? 00:00:00 akonadi_birthda
 2130 ? 00:00:00 akonadi_contact
 2131 ? 00:00:00 akonadi_ical_re
 2132 ? 00:00:00 akonadi_ical_re
 2133 ? 00:00:00 akonadi_maildir
 2134 ? 00:00:00 akonadi_maildis
 2135 ? 00:00:00 akonadi_nepomuk
 2136 ? 00:00:00 akonadi_vcard_r
 2156 ? 00:00:00 nepomukserver
 2161 ? 00:00:03 nepomukservices
 2167 ? 00:00:09 virtuoso-t
 2188 ? 00:00:00 kaccess
 2199 ? 00:00:00 krunner
 2202 ? 00:00:01 pulseaudio
 2204 ? 00:00:00 rtkit-daemon
 2218 ? 00:00:03 nepomukservices
 2220 ? 00:00:00 nepomukservices
 2222 ? 00:00:00 nepomukservices
 2223 ? 00:00:00 nepomukservices
 2224 ? 00:00:00 nepomukservices
 2232 ? 00:00:00 nepomukcontroll
 2234 ? 00:00:00 kmix
 2235 ? 00:02:32 ksysguard
 2242 ? 00:00:00 konsole
 2244 ? 00:00:30 ksysguardd
 2246 ? 00:00:02 dolphin
 2248 ? 00:00:33 firefox
 2250 pts/0 00:00:00 bash
 2312 ? 00:00:00 gconfd-2
 2313 ? 00:00:01 kate
 2340 ? 00:00:00 gvfsd
 2370 ? 00:00:00 kmozillahelper
 2406 ? 00:00:00 python
 2408 ? 00:00:00 polkit-kde-auth
 2410 ? 00:00:00 kworker/7:3
 2420 ? 00:00:00 klipper
 2429 ? 00:00:00 plugin-containe
 2442 ? 00:01:16 npviewer.bin
 2472 ? 00:00:06 xsensors
 2473 ? 00:00:20 chrome
 2488 ? 00:00:00 chrome
 2490 ? 00:00:00 udevd
 2491 ? 00:00:00 chrome
 2520 ? 00:00:04 chrome
 2524 ? 00:00:04 chrome
 2526 ? 00:00:00 chrome
 2548 ? 00:00:10 chrome
 2558 ? 00:00:03 chrome
 2564 ? 00:00:05 chrome
 2574 ? 00:00:00 chrome
 2598 ? 00:00:02 chrome
 2604 ? 00:00:02 chrome
 2626 ? 00:00:03 chrome
 2639 ? 00:00:02 chrome
 2641 ? 00:00:01 chrome
 2673 ? 00:00:13 chrome
 2741 ? 00:00:25 chrome
 2754 ? 00:03:06 npviewer.bin
 2859 ? 00:00:00 kpackagekitsmar
 2924 ? 00:00:00 kworker/3:3
 3174 ? 00:00:00 apache2
 3175 ? 00:00:00 apache2
 3176 ? 00:00:00 apache2
 3177 ? 00:00:00 apache2
 3178 ? 00:00:00 apache2
 3310 ? 00:00:00 kworker/3:1
 3508 ? 00:00:00 kworker/2:2
 3510 ? 00:00:00 kworker/4:1
 3524 ? 00:00:00 kworker/4:0
 3543 ? 00:00:00 kworker/0:0
 3555 ? 00:00:00 kworker/5:2
 3556 ? 00:00:00 kworker/1:4
 3580 ? 00:00:00 kworker/2:3
 3590 ? 00:00:00 kworker/u:1
 3601 ? 00:00:00 kworker/6:1
 3603 ? 00:00:00 kworker/1:3
 3612 ? 00:00:00 kworker/5:4
 3614 ? 00:00:00 kworker/1:2
 3624 ? 00:00:00 kworker/0:1
 3625 ? 00:00:00 kworker/5:1
 3628 ? 00:00:00 kworker/2:1
 3629 ? 00:00:00 kworker/6:0
 3630 ? 00:00:00 kworker/1:1
 3640 ? 00:00:00 kworker/u:0
 3642 ? 00:00:00 packagekitd
 3647 ? 00:00:00 kworker/5:0
 3663 ? 00:00:04 chrome
 3684 ? 00:00:00 kworker/2:0
 3685 ? 00:00:00 kworker/1:0
 3686 ? 00:00:00 kworker/4:2
 3687 ? 00:00:00 kworker/4:3
 3688 ? 00:00:00 kworker/5:3

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#5

Make a new user and log in as that, see if its better

Revision history for this message
mebuntu (salsa-temps) said : 		#6

OH, by the way. temple@ubuntu:

$ cut -d: -f1 /etc/passwd
root
daemon
bin
sys
sync
games
man
lp
mail
news
uucp
proxy
www-data
backup
list
irc
gnats
nobody
libuuid
syslog
mysql
messagebus
usbmux
avahi-autoipd
avahi
kernoops
pulse
rtkit
saned
hplip
kdm
temple
mediatomb
smbguest
libvirt-qemu
sshd

Revision history for this message
mebuntu (salsa-temps) said : 		#7

I only ever use the user "temple"

Revision history for this message
mebuntu (salsa-temps) said : 		#8

ok, will make another user tomorrow morning. Thank you.

Revision history for this message
mebuntu (salsa-temps) said : 		#9

I'm beginning to think it might be desktop effects that are crashing the system. I'll disable them and see if it stops crashing.

Revision history for this message
mebuntu (salsa-temps) said : 		#10

There you go! It just crashed. I had just been having a look at the various system logs and it just died. It literally goes to "power down" black screen, i.e. it doesn't show any kind of error message or shut down. When it rebooted nepomuk service stub came up with a crash. I can upload that into a bug report if need be. I'll create a new user now and see what happens.

Here's the crash information:

Application: Nepomuk Service Stub (nepomukservicestub), signal: Aborted
__lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
 in ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
[Current thread is 1 (Thread 0x7fa20842c780 (LWP 2238))]

Thread 5 (Thread 0x7fa1f74bb700 (LWP 2365)):
#0 __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1 0x00007fa205a8b80f in _L_lock_12013 () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007fa205a898d8 in __libc_free (mem=0x7fa205d9c1c0) at malloc.c:3736
#3 0x00007fa207f2bdbd in deleteNode (this=0xe484f0, it=...) at ../../include/QtCore/../../src/corelib/tools/qhash.h:508
#4 QHash<QObject*, QObject**>::erase (this=0xe484f0, it=...) at ../../include/QtCore/../../src/corelib/tools/qhash.h:838
#5 0x00007fa207f27923 in QMetaObject::removeGuard (ptr=0xf1ec28) at kernel/qobject.cpp:434
#6 0x00007fa20268e2d0 in ?? () from /usr/lib/libsopranoclient.so.1
#7 0x00007fa20268e319 in ?? () from /usr/lib/libsopranoclient.so.1
#8 0x00007fa202909105 in ?? () from /usr/lib/libsoprano.so.4
#9 0x00007fa206d8fbb8 in Nepomuk::ResourceData::determineUri (this=0xf118f0) at ../../nepomuk/core/resourcedata.cpp:561
#10 0x00007fa206da2775 in Nepomuk::Resource::determineFinalResourceData (this=0x7fa1f0001fb0) at ../../nepomuk/core/resource.cpp:930
#11 0x00007fa206da47cd in Nepomuk::Resource::operator== (this=0x7fa1f0001fb0, other=...) at ../../nepomuk/core/resource.cpp:503
#12 0x00007fa1fe69e5a4 in QList<Nepomuk::Query::Term>::contains (this=<value optimized out>, t=...) at /usr/include/qt4/QtCore/qlist.h:864
#13 0x00007fa1fe69e09a in Nepomuk::Query::Term::optimized (this=0xf13960) at ../../../nepomuk/query/term.cpp:110
#14 0x00007fa1fe69dfe8 in Nepomuk::Query::Term::optimized (this=0x7fa1f74ba8c0) at ../../../nepomuk/query/term.cpp:101
#15 0x00007fa1fe6aa1a5 in Nepomuk::Query::Query::toSparqlQuery (this=0xefad28, sparqlFlags=...) at ../../../nepomuk/query/query.cpp:438
#16 0x00007fa1f7d003db in Nepomuk::Query::Folder::sparqlQuery (this=<value optimized out>) at ../../../../nepomuk/services/queryservice/folder.cpp:122
#17 0x00007fa1f7d03157 in Nepomuk::Query::SearchRunnable::run (this=0xeff170) at ../../../../nepomuk/services/queryservice/searchrunnable.cpp:81
#18 0x00007fa207e22188 in QThreadPoolThread::run (this=0xefde00) at concurrent/qthreadpool.cpp:106
#19 0x00007fa207e2d175 in QThreadPrivate::start (arg=0xefde00) at thread/qthread_unix.cpp:320
#20 0x00007fa2057f5d8c in start_thread (arg=0x7fa1f74bb700) at pthread_create.c:304
#21 0x00007fa205af304d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#22 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fa1f6cba700 (LWP 2366)):
#0 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1 0x00007fa207e2c2b3 in QMutexPrivate::wait (this=0xef2e40, timeout=-1) at thread/qmutex_unix.cpp:84
#2 0x00007fa207e28ce5 in QMutex::lock (this=0xef39f0) at thread/qmutex.cpp:167
#3 0x00007fa206da275c in QMutexLocker (this=<value optimized out>) at /usr/include/qt4/QtCore/qmutex.h:102
#4 Nepomuk::Resource::determineFinalResourceData (this=<value optimized out>) at ../../nepomuk/core/resource.cpp:926
#5 0x00007fa206da47cd in Nepomuk::Resource::operator== (this=0xf12c60, other=...) at ../../nepomuk/core/resource.cpp:503
#6 0x00007fa1fe69e5a4 in QList<Nepomuk::Query::Term>::contains (this=<value optimized out>, t=...) at /usr/include/qt4/QtCore/qlist.h:864
#7 0x00007fa1fe69e09a in Nepomuk::Query::Term::optimized (this=0x7fa1f00026c0) at ../../../nepomuk/query/term.cpp:110
#8 0x00007fa1fe69dfe8 in Nepomuk::Query::Term::optimized (this=0x7fa1f6cb99b0) at ../../../nepomuk/query/term.cpp:101
#9 0x00007fa1fe6aa1a5 in Nepomuk::Query::Query::toSparqlQuery (this=0x7fa1f6cb9db0, sparqlFlags=...) at ../../../nepomuk/query/query.cpp:438
#10 0x00007fa1f7d03d35 in Nepomuk::Query::CountQueryRunnable::run (this=0xeff2e0) at ../../../../nepomuk/services/queryservice/countqueryrunnable.cpp:74
#11 0x00007fa207e22188 in QThreadPoolThread::run (this=0xeff3c0) at concurrent/qthreadpool.cpp:106
#12 0x00007fa207e2d175 in QThreadPrivate::start (arg=0xeff3c0) at thread/qthread_unix.cpp:320
#13 0x00007fa2057f5d8c in start_thread (arg=0x7fa1f6cba700) at pthread_create.c:304
#14 0x00007fa205af304d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#15 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fa1f64b9700 (LWP 2368)):
#0 __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1 0x00007fa205a8b80f in _L_lock_12013 () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007fa205a898d8 in __libc_free (mem=0x7fa205d9c1c0) at malloc.c:3736
#3 0x00007fa207ecaa04 in ~QByteArray (this=0x7fa1f00057a0, parseOptions=QUrlPrivate::ParseAndSet) at ../../include/QtCore/../../src/corelib/tools/qbytearray.h:383
#4 QUrlPrivate::parse (this=0x7fa1f00057a0, parseOptions=QUrlPrivate::ParseAndSet) at io/qurl.cpp:3830
#5 0x00007fa207ed624b in QUrl::operator== (this=0x7fa1f64b7890, url=...) at io/qurl.cpp:5958
#6 0x00007fa206db1c32 in Nepomuk::Types::EntityPrivate::load (this=0xef3c70) at ../../nepomuk/types/entity.cpp:99
#7 0x00007fa206db0961 in Nepomuk::Types::EntityPrivate::init (this=0xef3c70) at ../../nepomuk/types/entity.cpp:51
#8 0x00007fa206db80d7 in Nepomuk::Types::Property::maxCardinality (this=<value optimized out>) at ../../nepomuk/types/property.cpp:384
#9 0x00007fa1fe6a1700 in uniqueVarName (this=0x7fa1f00040b0, qbd=0x7fa1f64b8310) at ../../../nepomuk/query/querybuilderdata_p.h:121
#10 Nepomuk::Query::ComparisonTermPrivate::getMainVariableName (this=0x7fa1f00040b0, qbd=0x7fa1f64b8310) at ../../../nepomuk/query/comparisonterm.cpp:357
#11 0x00007fa1fe6a1e8d in Nepomuk::Query::ComparisonTermPrivate::toSparqlGraphPattern (this=0x7fa1f00040b0, resourceVarName=..., qbd=0x7fa1f64b8310) at ../../../nepomuk/query/comparisonterm.cpp:142
#12 0x00007fa1fe69fe36 in Nepomuk::Query::AndTermPrivate::toSparqlGraphPattern (this=<value optimized out>, resourceVarName=..., qbd=0x7fa1f64b8310) at ../../../nepomuk/query/andterm.cpp:34
#13 0x00007fa1fe6aa318 in Nepomuk::Query::Query::toSparqlQuery (this=0xef38a8, sparqlFlags=...) at ../../../nepomuk/query/query.cpp:466
#14 0x00007fa1f7d003db in Nepomuk::Query::Folder::sparqlQuery (this=<value optimized out>) at ../../../../nepomuk/services/queryservice/folder.cpp:122
#15 0x00007fa1f7d03157 in Nepomuk::Query::SearchRunnable::run (this=0xf18df0) at ../../../../nepomuk/services/queryservice/searchrunnable.cpp:81
#16 0x00007fa207e22188 in QThreadPoolThread::run (this=0xf18ee0) at concurrent/qthreadpool.cpp:106
#17 0x00007fa207e2d175 in QThreadPrivate::start (arg=0xf18ee0) at thread/qthread_unix.cpp:320
#18 0x00007fa2057f5d8c in start_thread (arg=0x7fa1f64b9700) at pthread_create.c:304
#19 0x00007fa205af304d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#20 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fa1f5cb8700 (LWP 2369)):
[KCrash Handler]
#6 0x00007fa205a40d05 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#7 0x00007fa205a44ab6 in abort () at abort.c:92
#8 0x00007fa205a79d7b in __libc_message (do_abort=2, fmt=0x7fa205b62400 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:189
#9 0x00007fa205a83bb6 in malloc_printerr (action=3, str=0x7fa205b62980 "malloc(): memory corruption (fast)", ptr=<value optimized out>) at malloc.c:6283
#10 0x00007fa205a86e78 in _int_malloc (av=0x7fa205d9c1c0, bytes=<value optimized out>) at malloc.c:4308
#11 0x00007fa205a8931e in __libc_malloc (bytes=41) at malloc.c:3660
#12 0x00007fa207e2f036 in QByteArray::QByteArray (this=0x7fa1f5cb6630, data=0x7fa1f0005781 "hasSymbol", size=9) at tools/qbytearray.cpp:1306
#13 0x00007fa207ecab79 in QUrlPrivate::parse (this=0x7fa1f00057a0, parseOptions=QUrlPrivate::ParseAndSet) at io/qurl.cpp:3850
#14 0x00007fa207ed624b in QUrl::operator== (this=0x7fa1f5cb6890, url=...) at io/qurl.cpp:5958
#15 0x00007fa206db1c32 in Nepomuk::Types::EntityPrivate::load (this=0xefbf80) at ../../nepomuk/types/entity.cpp:99
#16 0x00007fa206db0961 in Nepomuk::Types::EntityPrivate::init (this=0xefbf80) at ../../nepomuk/types/entity.cpp:51
#17 0x00007fa206db80d7 in Nepomuk::Types::Property::maxCardinality (this=<value optimized out>) at ../../nepomuk/types/property.cpp:384
#18 0x00007fa1fe6a1700 in uniqueVarName (this=0xf1a990, qbd=0x7fa1f5cb7310) at ../../../nepomuk/query/querybuilderdata_p.h:121
#19 Nepomuk::Query::ComparisonTermPrivate::getMainVariableName (this=0xf1a990, qbd=0x7fa1f5cb7310) at ../../../nepomuk/query/comparisonterm.cpp:357
#20 0x00007fa1fe6a1e8d in Nepomuk::Query::ComparisonTermPrivate::toSparqlGraphPattern (this=0xf1a990, resourceVarName=..., qbd=0x7fa1f5cb7310) at ../../../nepomuk/query/comparisonterm.cpp:142
#21 0x00007fa1fe69fe36 in Nepomuk::Query::AndTermPrivate::toSparqlGraphPattern (this=<value optimized out>, resourceVarName=..., qbd=0x7fa1f5cb7310) at ../../../nepomuk/query/andterm.cpp:34
#22 0x00007fa1fe6aa318 in Nepomuk::Query::Query::toSparqlQuery (this=0xef8de8, sparqlFlags=...) at ../../../nepomuk/query/query.cpp:466
#23 0x00007fa1f7d003db in Nepomuk::Query::Folder::sparqlQuery (this=<value optimized out>) at ../../../../nepomuk/services/queryservice/folder.cpp:122
#24 0x00007fa1f7d03157 in Nepomuk::Query::SearchRunnable::run (this=0xf19760) at ../../../../nepomuk/services/queryservice/searchrunnable.cpp:81
#25 0x00007fa207e22188 in QThreadPoolThread::run (this=0xf19880) at concurrent/qthreadpool.cpp:106
#26 0x00007fa207e2d175 in QThreadPrivate::start (arg=0xf19880) at thread/qthread_unix.cpp:320
#27 0x00007fa2057f5d8c in start_thread (arg=0x7fa1f5cb8700) at pthread_create.c:304
#28 0x00007fa205af304d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#29 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa20842c780 (LWP 2238)):
#0 __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1 0x00007fa205a8b80f in _L_lock_12013 () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007fa205a898d8 in __libc_free (mem=0x7fa205d9c1c0) at malloc.c:3736
#3 0x00007fa207f3ee57 in socketNotifierSourceCheck (source=0xdd5980) at kernel/qeventdispatcher_glib.cpp:92
#4 0x00007fa204d19854 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007fa204d1a122 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6 0x00007fa204d1a639 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7 0x00007fa207f3f3ef in QEventDispatcherGlib::processEvents (this=0xd8c4a0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#8 0x00007fa20630a4de in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#9 0x00007fa207f13882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#10 0x00007fa207f13abc in QEventLoop::exec (this=0x7fffea9bcaf0, flags=...) at kernel/qeventloop.cpp:201
#11 0x00007fa207f17ecb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#12 0x0000000000403c3f in main (argc=2, argv=<value optimized out>) at ../../../nepomuk/servicestub/main.cpp:165

Revision history for this message
Joshua O'Leary (jmoleary) said : 		#11

If the desktop effects are crashing try this:
Go into kde system settings > Desktop Effects
Click the Advanced tab.
Change compositing type to 'XRender' and click apply.

The OpenGL compositing often crashes the netbook's cards, as did mine, but Xrender is much more lightweight.

Revision history for this message
mebuntu (salsa-temps) said : 		#12

OK, I'll try that maybe in a day or two, if it doesn't crash when effects are off.

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mebuntu (salsa-temps) said : 		#13

Crashed again while I was out. I will change to XRender and see what happens.

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mebuntu (salsa-temps) said : 		#14

Not convinced it's anything to do with OpenGL as desktop effects were switched off anyway. Does anyone know which log might give us some evidence?

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mebuntu (salsa-temps) said : 		#15

Hello, well, I created the new user and switched off opengl and it crashed this morning while I was out for a couple of hours. How can I get any diags? I'm thinking of going to Oneiric later this week so maybe I should go for it and see what happens? It would be better to find some kind of diagnostic info' though.

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actionparsnip (andrew-woodhead666) said : 		#16

Have you tested your RAM using memtest from Grub?

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mebuntu (salsa-temps) said : 		#17

Yes, I mentioned that at the beginning of the thread. Ram memtest overnight and no errors.

Revision history for this message
Babak (b-bostan) said : 		#18

I have also kinda the same issue. I upgraded to kubuntu 11.04 (natty) about a month ago and didn't have any issues till today when my machine crashed 3 times. I wasn't running any apps but chrome, Firefox and console. In my case the crash was different from what mebuntu is experiencing. In my case the screen freezes ( the mouse doesn't move) and then after a minute or so mouse starts working but everything else is still frozen (I can move the mouse but can't click or drag anything). And I have to restart the machine.
I tried to find a log file that can give me a clue but couldn't. Can you direct me to the correct log file. I have also switched to XRender to see if it helps and would let you know if it freezes again. I am running an Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz, 8Gig RARM, 42Gig Swap. And I am the only user on this machine who has logged in ever.

Revision history for this message
Babak (b-bostan) said : 		#19

I confirm that my machine is still crashing. It actually crashed three times today right after each other. However, I know that it is just the UI that crashes. Because I was listening to grooveshark over internet and it didn't stop after the crash. Is there any log file that I can take a look at?

Revision history for this message
mebuntu (salsa-temps) said : 		#20

Well, I'll probably have to close this question. I've installed Oneiric today and so I have waved goodbye to Natty. Initial impression is good as always. We'll see if there's still a crash. The annoying issue of not saving my dual monitor setup is still present. GRRR.

Revision history for this message
mebuntu (salsa-temps) said : 		#21

It's not really solved but I will not pursue it here.