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Message #15449
[Bug 1300722] Re: hud-service is eating up 100% of one of my CPUs in a poll loop
What I'm looking for is a way to cause this to happen by running a
single application and performing a particular action in it. Even if it
takes a number of tries that's fine. I just need to be able to trigger
somewhat reliably within a few minutes.
I know exactly the part of the codebase that is getting sent into this
loop, but I simply don't understand how it's getting there.
You can determine which application is the culprit by looking in
"~/.cache/upstart/hud.log". In there you'll probably see it mentioning
an application hitting a "safety value". The app will have an ID like
":1.22". If you use the application d-feet (see screenshot above) you
will be able to figure out which application it is. The IDs are
temporary, so if the window has closed, you won't be able to find out
what application it was.
--
You received this bug notification because you are a member of DX
Packages, which is subscribed to hud in Ubuntu.
https://bugs.launchpad.net/bugs/1300722
Title:
hud-service is eating up 100% of one of my CPUs in a poll loop
Status in Unity HUD:
Confirmed
Status in “hud” package in Ubuntu:
In Progress
Bug description:
hud-service is polling like crazy:
Context Switches:
PID Process Voluntary Involuntary Total
Ctxt Sw/Sec Ctxt Sw/Sec Ctxt Sw/Sec
2295 hud-service 46084.63 42.94 46127.58 (very high)
2325 hud-service 0.09 0.00 0.09 (very low)
2329 hud-service 0.07 0.00 0.07 (very low)
2340 hud-service 0.05 0.00 0.05 (very low)
Total 46084.84 42.94 46127.78
File I/O operations:
No file I/O operations detected.
System calls traced:
PID Process Syscall Count Rate/Sec
2295 hud-service poll 999983 23124.8503
2295 hud-service write 10 0.2313
2295 hud-service sendmsg 4 0.0925
2325 hud-service restart_syscall 1 0.0231
2329 hud-service restart_syscall 1 0.0231
2340 hud-service restart_syscall 1 0.0231
Total 1000000 23125.2435
(gdb) where
#0 0x00007fda8121cfbd in poll () at ../sysdeps/unix/syscall-template.S:81
#1 0x00007fda7f1bb4b8 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#2 0x00007fda7f1ba3ff in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#3 0x00007fda7f1a49dc in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#4 0x00007fda7f1a5464 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#5 0x00007fda82ce9e65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6 0x00007fda82d2fc64 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7 0x00007fda82d30582 in QDBusPendingCallWatcher::waitForFinished() () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8 0x00007fda83eb940b in DBusMenuImporter::slotMenuAboutToShow() () from /usr/lib/x86_64-linux-gnu/libdbusmenu-qt5.so.2
#9 0x00007fda8435d2a6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x000000000045ab3f in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
#11 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
#12 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
#13 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
#14 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
#15 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
#16 0x000000000045ae8d in hud::service::DBusMenuCollector::activate() ()
#17 0x0000000000441e43 in hud::service::WindowImpl::activate() ()
#18 0x0000000000439f6a in hud::service::QueryImpl::updateToken(QSharedPointer<hud::service::Window>) ()
#19 0x000000000043a672 in hud::service::QueryImpl::refresh() ()
#20 0x000000000044b115 in ?? ()
#21 0x00007fda8435d2a6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x000000000045662a in hud::service::ApplicationListImpl::FocusedWindowChanged(unsigned int, QString const&, unsigned int) ()
#23 0x00007fda8435d2a6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x0000000000467361 in ComCanonicalUnityWindowStackInterface::FocusedWindowChanged(unsigned int, QString const&, unsigned int) ()
#25 0x00000000004678bd in ?? ()
#26 0x0000000000467c63 in ComCanonicalUnityWindowStackInterface::qt_metacall(QMetaObject::Call, int, void**) ()
#27 0x00007fda82cf180f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#28 0x00007fda8435e22e in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007fda823d5c2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007fda823dadf6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007fda84335c2d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007fda84337e07 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007fda84382cd3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007fda833dbe04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007fda833dc048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: hud 13.10.1+14.04.20140326-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7
Uname: Linux 3.13.0-20-generic x86_64
ApportVersion: 2.14-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Apr 1 12:23:11 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-03-25 (7 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140323)
SourcePackage: hud
UpgradeStatus: No upgrade log present (probably fresh install)
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References
