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Bug 2461 - KGet uses 100% of CPU
Summary: KGet uses 100% of CPU
Status: NEW
Alias: None
Product: TDE
Classification: Unclassified
Component: tdenetwork (show other bugs)
Version: 3.5.13.x [Trinity]
Hardware: amd64 Debian Wheezy
: P5 normal
Assignee: Timothy Pearson
URL:
Depends on:
Blocks:
 
Reported: 2015-06-16 01:08 CDT by Jan Stolarek
Modified: 2018-05-27 11:11 CDT (History)
4 users (show)

See Also:
Compiler Version:
TDE Version String:
Application Version:
Application Name:

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Description Jan Stolarek 2015-06-16 01:08:25 CDT 
It often happens that during downloading KGet starts using 100% of CPU power. Pausing all the downloads does not help. I'm experiencing the problem on one machine with TDE 3.5.13.2 and on a different machine that still uses KDE 3.5, so the problem has been present for quite long.
Comment 1 Timothy Pearson 2015-06-16 02:10:06 CDT 
It would greatly help troubleshooting if you could generate a backtrace of kget while it is using 100% of your CPU.  You will need the tdenetwork-trinity debug symbols installed, then execute:
gdb --pid <pid of the kget process>
thread apply all bt

Please post the results here for analysis; we can then work on resolving the issue.

Thanks!
Comment 2 Jan Stolarek 2015-06-17 04:24:33 CDT 
I'm trying to reproduce the problem but can't. One possibility is that I exaggerated by saying this happens often. Or is there a chance that installing debugging libraries somehow makes the problem go away?
Comment 3 Alex Couture 2015-06-28 08:26:41 CDT 
I confirm that the CPU use is quite high at 25-40% on my Asus EEE X101CH with Ubuntu 14.10 and TDE R14 nighlty build. I'll try to give debug info.

-Alexandre
Comment 4 Alex Couture 2015-06-28 08:37:44 CDT 
Is there something interesting in this? It seems quite short:


[sudo] password for alexandre:
GNU gdb (Ubuntu 7.8-1ubuntu4) 7.8.0.20141001-cvs
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
Type "show configuration" for configuration details.
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Attaching to process 3579
Reading symbols from /opt/trinity/bin/kget...(no debugging symbols found)...done.
Reading symbols from /opt/trinity/lib/libtdeio.so.14...Reading symbols from /usr/lib/debug//opt/trinity/lib/libtdeio.so.14.0.0...done.
done.
Loaded symbols for /opt/trinity/lib/libtdeio.so.14
Reading symbols from /usr/lib/i386-linux-gnu/libXext.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXext.so.6
Reading symbols from /opt/trinity/lib/libtdeui.so.14...Reading symbols from /usr/lib/debug//opt/trinity/lib/libtdeui.so.14.0.0...done.
done.
Loaded symbols for /opt/trinity/lib/libtdeui.so.14
Reading symbols from /opt/trinity/lib/libtdecore.so.14...Reading symbols from /usr/lib/debug//opt/trinity/lib/libtdecore.so.14.0.0...done.
done.
Loaded symbols for /opt/trinity/lib/libtdecore.so.14
Reading symbols from /opt/trinity/lib/libDCOP.so.14...Reading symbols from /usr/lib/debug//opt/trinity/lib/libDCOP.so.14.0.0...done.
done.
Loaded symbols for /opt/trinity/lib/libDCOP.so.14
Reading symbols from /usr/lib/libtqt-mt.so.3...Reading symbols from /usr/lib/debug//usr/lib/libtqt-mt.so.3.5.0...done.
done.
Loaded symbols for /usr/lib/libtqt-mt.so.3
Reading symbols from /usr/lib/i386-linux-gnu/libstdc++.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libstdc++.so.6
Reading symbols from /lib/i386-linux-gnu/libc.so.6...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/libc-2.19.so...done.
done.
Loaded symbols for /lib/i386-linux-gnu/libc.so.6
Reading symbols from /lib/i386-linux-gnu/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libgcc_s.so.1
Reading symbols from /opt/trinity/lib/libtdesu.so.14...Reading symbols from /usr/lib/debug//opt/trinity/lib/libtdesu.so.14.0.0...done.
done.
Loaded symbols for /opt/trinity/lib/libtdesu.so.14
Reading symbols from /opt/trinity/lib/libtdewalletclient.so.1...Reading symbols from /usr/lib/debug//opt/trinity/lib/libtdewalletclient.so.1.0.1...done.
done.
Loaded symbols for /opt/trinity/lib/libtdewalletclient.so.1
Reading symbols from /usr/lib/libr.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libr.so.0
Reading symbols from /lib/i386-linux-gnu/libacl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libacl.so.1
Reading symbols from /usr/lib/i386-linux-gnu/libmagic.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libmagic.so.1
Reading symbols from /lib/i386-linux-gnu/libdl.so.2...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/libdl-2.19.so...done.
done.
Loaded symbols for /lib/i386-linux-gnu/libdl.so.2
Reading symbols from /usr/lib/i386-linux-gnu/libX11.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libX11.so.6
Reading symbols from /lib/i386-linux-gnu/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libz.so.1
Reading symbols from /usr/lib/i386-linux-gnu/libfontconfig.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libfontconfig.so.1
Reading symbols from /opt/trinity/lib/libtdefx.so.14...Reading symbols from /usr/lib/debug//opt/trinity/lib/libtdefx.so.14.0.0...done.
done.
Loaded symbols for /opt/trinity/lib/libtdefx.so.14
Reading symbols from /usr/lib/libtqt.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libtqt.so.4
Reading symbols from /lib/i386-linux-gnu/libm.so.6...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/libm-2.19.so...done.
done.
Loaded symbols for /lib/i386-linux-gnu/libm.so.6
Reading symbols from /usr/lib/i386-linux-gnu/libidn.so.11...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libidn.so.11
Reading symbols from /usr/lib/i386-linux-gnu/libXcomposite.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXcomposite.so.1
Reading symbols from /usr/lib/i386-linux-gnu/libICE.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libICE.so.6
Reading symbols from /usr/lib/i386-linux-gnu/libSM.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libSM.so.6
Reading symbols from /lib/i386-linux-gnu/libudev.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libudev.so.1
Reading symbols from /usr/lib/libdbus-1-tqt.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libdbus-1-tqt.so.0
Reading symbols from /usr/lib/libart_lgpl_2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libart_lgpl_2.so.2
Reading symbols from /usr/lib/i386-linux-gnu/libXrender.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXrender.so.1
Reading symbols from /lib/i386-linux-gnu/libuuid.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libuuid.so.1
Reading symbols from /usr/lib/i386-linux-gnu/libaudio.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libaudio.so.2
Reading symbols from /usr/lib/i386-linux-gnu/libjpeg.so.8...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libjpeg.so.8
Reading symbols from /lib/i386-linux-gnu/libpng12.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libpng12.so.0
Reading symbols from /lib/i386-linux-gnu/libglib-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libglib-2.0.so.0
Reading symbols from /usr/lib/i386-linux-gnu/libXi.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXi.so.6
Reading symbols from /usr/lib/i386-linux-gnu/libXrandr.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXrandr.so.2
Reading symbols from /usr/lib/i386-linux-gnu/libXcursor.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXcursor.so.1
Reading symbols from /usr/lib/i386-linux-gnu/libXinerama.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXinerama.so.1
Reading symbols from /usr/lib/i386-linux-gnu/libXft.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXft.so.2
Reading symbols from /usr/lib/i386-linux-gnu/libfreetype.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libfreetype.so.6
Reading symbols from /lib/i386-linux-gnu/libpthread.so.0...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/libpthread-2.19.so...done.
done.
[New LWP 3596]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
Loaded symbols for /lib/i386-linux-gnu/libpthread.so.0
Reading symbols from /lib/ld-linux.so.2...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/ld-2.19.so...done.
done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /usr/lib/libbfd-2.24.90-system.20141014.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libbfd-2.24.90-system.20141014.so
Reading symbols from /lib/i386-linux-gnu/libattr.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libattr.so.1
Reading symbols from /usr/lib/i386-linux-gnu/libxcb.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libxcb.so.1
Reading symbols from /lib/i386-linux-gnu/libexpat.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libexpat.so.1
Reading symbols from /lib/i386-linux-gnu/libselinux.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libselinux.so.1
Reading symbols from /lib/i386-linux-gnu/librt.so.1...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/librt-2.19.so...done.
done.
Loaded symbols for /lib/i386-linux-gnu/librt.so.1
Reading symbols from /lib/i386-linux-gnu/libdbus-1.so.3...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libdbus-1.so.3
Reading symbols from /usr/lib/i386-linux-gnu/libXt.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXt.so.6
Reading symbols from /usr/lib/i386-linux-gnu/libXau.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXau.so.6
Reading symbols from /lib/i386-linux-gnu/libpcre.so.3...(no debugging symbols found)...done.
Loaded symbols for /lib/i386-linux-gnu/libpcre.so.3
Reading symbols from /usr/lib/i386-linux-gnu/libXfixes.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXfixes.so.3
Reading symbols from /usr/lib/i386-linux-gnu/libXdmcp.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libXdmcp.so.6
Reading symbols from /lib/i386-linux-gnu/libnss_compat.so.2...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/libnss_compat-2.19.so...done.
done.
Loaded symbols for /lib/i386-linux-gnu/libnss_compat.so.2
Reading symbols from /lib/i386-linux-gnu/libnsl.so.1...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/libnsl-2.19.so...done.
done.
Loaded symbols for /lib/i386-linux-gnu/libnsl.so.1
Reading symbols from /lib/i386-linux-gnu/libnss_nis.so.2...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/libnss_nis-2.19.so...done.
done.
Loaded symbols for /lib/i386-linux-gnu/libnss_nis.so.2
Reading symbols from /lib/i386-linux-gnu/libnss_files.so.2...Reading symbols from /usr/lib/debug//lib/i386-linux-gnu/libnss_files-2.19.so...done.
done.
Loaded symbols for /lib/i386-linux-gnu/libnss_files.so.2
Reading symbols from /usr/lib/tqt3/plugins/imageformats/libqmng.so...Reading symbols from /usr/lib/debug//usr/lib/tqt3/plugins/imageformats/libqmng.so...done.
done.
Loaded symbols for /usr/lib/tqt3/plugins/imageformats/libqmng.so
Reading symbols from /usr/lib/i386-linux-gnu/libmng.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/libmng.so.2
Reading symbols from /usr/lib/i386-linux-gnu/liblcms2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i386-linux-gnu/liblcms2.so.2
Reading symbols from /opt/trinity/lib/trinity/plugins/styles/qtcurve.so...Reading symbols from /usr/lib/debug//opt/trinity/lib/trinity/plugins/styles/qtcurve.so...done.
done.
Loaded symbols for /opt/trinity/lib/trinity/plugins/styles/qtcurve.so
Reading symbols from /usr/lib/tqt3/plugins/inputmethods/libqimsw-multi.so...Reading symbols from /usr/lib/debug//usr/lib/tqt3/plugins/inputmethods/libqimsw-multi.so...done.
done.
Loaded symbols for /usr/lib/tqt3/plugins/inputmethods/libqimsw-multi.so
Reading symbols from /usr/lib/tqt3/plugins/inputmethods/libqimsw-none.so...Reading symbols from /usr/lib/debug//usr/lib/tqt3/plugins/inputmethods/libqimsw-none.so...done.
done.
Loaded symbols for /usr/lib/tqt3/plugins/inputmethods/libqimsw-none.so
Reading symbols from /usr/lib/tqt3/plugins/inputmethods/libqsimple.so...Reading symbols from /usr/lib/debug//usr/lib/tqt3/plugins/inputmethods/libqsimple.so...done.
done.
Loaded symbols for /usr/lib/tqt3/plugins/inputmethods/libqsimple.so
Reading symbols from /usr/lib/tqt3/plugins/inputmethods/libqxim.so...Reading symbols from /usr/lib/debug//usr/lib/tqt3/plugins/inputmethods/libqxim.so...done.
done.
Loaded symbols for /usr/lib/tqt3/plugins/inputmethods/libqxim.so
pthread_mutex_lock (mutex=0x8cbd80c) at forward.c:192
192     forward.c: No such file or directory.
(gdb) thread apply all bt

Thread 2 (Thread 0xb4ffbb40 (LWP 3596)):
#0  0xb76fdc80 in __kernel_vsyscall ()
#1  0xb5a07cac in pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:187
#2  0xb61680bc in __pthread_cond_wait (cond=0x8cc8b20,
    mutex=0xb6b2c364 <TQWaitCondition::wait(unsigned long)::mutex>)
    at forward.c:149
#3  0xb677b0fc in TQWaitCondition::wait (this=0x8cbb48c, time=4294967295)
    at tools/qwaitcondition_unix.cpp:245
#4  0x080693aa in Slave::run() ()
#5  0xb64c2ee0 in TQThreadInstance::start (_arg=0x8cc39a4)
    at kernel/qthread_unix.cpp:142
#6  0xb5b7b0ba in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#7  0xb5b248f4 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#8  0xb5a03f16 in start_thread (arg=0xb4ffbb40) at pthread_create.c:309
#9  0xb615b11e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:129

Thread 1 (Thread 0xb57027c0 (LWP 3579)):
#0  pthread_mutex_lock (mutex=0x8cbd80c) at forward.c:192
#1  0xb677a55e in TQRecursiveMutexPrivate::lock (this=0x8cbd808)
    at tools/qmutex_unix.cpp:251
---Type <return> to continue, or q <return> to quit---
#2  0xb677a9e0 in TQMutex::lock (this=0x8d65410) at tools/qmutex_unix.cpp:479
#3  0xb6523e00 in TQObject::activate_signal (this=0x8d78360, clist=0x8d26308,
    o=0xbfa7854c) at kernel/qobject.cpp:2807
#4  0xb65242f7 in TQObject::activate_signal (this=0x8d78360, signal=148093536,
    param=18) at kernel/qobject.cpp:2963
#5  0xb68144e7 in TQSocketNotifier::activated (this=0x8d78360, t0=18)
    at .moc/release-shared-mt/moc_ntqsocketnotifier.cpp:94
#6  0xb6542c6c in TQSocketNotifier::event (this=0x8d78360, e=0xbfa787a0)
    at kernel/qsocketnotifier.cpp:261
#7  0xb64c9b1b in TQApplication::internalNotify (this=0x8cbd80c,
    receiver=0x8d78360, e=0xbfa787a0) at kernel/qapplication.cpp:2883
#8  0xb64ca089 in TQApplication::notify (this=0xbfa78a2c, receiver=0x8d78360,
    e=0xbfa787a0) at kernel/qapplication.cpp:2726
#9  0xb6c1860d in TDEApplication::notify (this=0xbfa78a2c, receiver=0x8d78360,
    event=0xbfa787a0)
    at /build/buildd/tdelibs-trinity-14.1.0~r1256/tdecore/tdeapplication.cpp:660
#10 0xb64c9967 in TQApplication::sendEvent (receiver=0x8d78360,
    event=0xbfa787a0) at kernel/qapplication.cpp:2458
#11 0xb64bfafd in TQEventLoop::activateSocketNotifiers (this=0x8ad7620)
    at kernel/qeventloop_unix_glib.cpp:735
#12 0xb64ab466 in TQEventLoop::gsourceDispatch (this=0x8ad7620, gs=0x8ad6ba0)
    at kernel/qeventloop_x11_glib.cpp:587
---Type <return> to continue, or q <return> to quit---
#13 0xb64ab4ea in qt_gsource_dispatch (source=0x8ad6ba0, callback=0x0,
    user_data=0x0) at kernel/qeventloop_x11_glib.cpp:123
#14 0xb5b53c04 in g_main_context_dispatch ()
   from /lib/i386-linux-gnu/libglib-2.0.so.0
#15 0xb5b53f29 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#16 0xb5b53ff6 in g_main_context_iteration ()
   from /lib/i386-linux-gnu/libglib-2.0.so.0
#17 0xb64aa981 in TQEventLoop::processEvents (this=0x8ad7620, flags=4)
    at kernel/qeventloop_x11_glib.cpp:279
#18 0xb64dee5b in TQEventLoop::enterLoop (this=0x8ad7620)
    at kernel/qeventloop.cpp:227
#19 0xb64dede4 in TQEventLoop::exec (this=0x8ad7620)
    at kernel/qeventloop.cpp:174
#20 0xb64ca8dd in TQApplication::exec (this=0xbfa78a2c)
    at kernel/qapplication.cpp:3015
#21 0x080687bf in main ()
(gdb)        

Hope it helps!
-Alexandre
Comment 5 Jan Stolarek 2015-06-28 08:41:38 CDT 
During normal operation KGet uses around 25%-40% of CPU on my machine as well, so I wouldn't say that's unusual. What happens when you pause all the downloads? The way this bug manifests is that the CPU usage stays at 100%.

Please post logs by putting them into a file and attaching that file to a ticket - otherwise the discussion is extremely hard to read.
Comment 6 Alex Couture 2015-06-28 08:47:28 CDT 
Hi,

When on pause, I get 0.3% CPU use in kget. 25-40% CPU use to download a file on a moder computer is quite high.

-Alexandre