[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Paul White]

Bug report did not expire due to presence of an upstream bug
Upstream report was closed "RESOLVED OBSOLETE" on 2021-06-18
Last comment re bug was over 15 years ago and there was no reply to comment #53
Closing as bug report is no longer valid for currently supported releases of 
Ubuntu


** Changed in: nautilus (Ubuntu)
   Status: Incomplete => Invalid

** Changed in: nautilus (Ubuntu)
 Assignee: Ubuntu Desktop Bugs (desktop-bugs) => (unassigned)

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Sebastien Bacher]

Do you still get the issue in newer versions?

** Changed in: nautilus (Ubuntu)
   Status: Triaged => Incomplete

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Bug Watch Updater]

** Changed in: nautilus
   Status: Unknown => New

** Changed in: nautilus
   Importance: Unknown => Medium

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Martin Mai]

Thanks for the trace. I linked it at the upstream bug.

** Changed in: nautilus (Ubuntu)
   Status: Incomplete => Triaged

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

That's the one of the running nautilus, should be useful this time

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Here it is, the one with the backtrace you previously asked me

** Attachment added: "gdb-nautilus.txt"
   http://launchpadlibrarian.net/37021359/gdb-nautilus.txt

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

There are missing debug libraries that's why I stopped the process
without following the instruction, I need somebody to tell me which
packages to download to have the libraries I need, or I'm afraid the
backtrace won't be useful!

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Chris Coulson]

Thanks, but there is no backtrace there, because it seems you didn't run
"bt full" after interrupting Nautilus. Could you please try again?

Thanks

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

About our conversation, I filed the reports this morning.

However, I tried attaching the debug as mr. Coulson told me, I combined
the standard instructions with the ones you gave me Dave, loading the
libraries as it was pointed out in your post:

(gdb) symbol-file /usr/lib/debug/usr/bin/nautilus
Reading symbols from /usr/lib/debug/usr/bin/nautilus...done.

but sadly the output is a list of tons of missing debug libraries. I
attached the output, maybe you can help me finding the packages which
provide the libraries I'm missing.

Thanks in advance for your time.


** Attachment added: "gdb-nautilus.txt"
   http://launchpadlibrarian.net/37017881/gdb-nautilus.txt

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

I'm on it, I let you know if help is needed.
I it sounded offensive, I want you to know that it wasn't the goal of my 
observation. However to find bugs in Ubuntu depends on the kind of usage you do 
of the os, i'll make you an example:
I have a phenom II 965, I'm overclocking it that's why I need an accurate 
temperatures monitoring. In other OS it's not a big deal, but it took me 2 
hours to find a workaround because there are no k10 sensor scripts in ubuntu 
yet, and I had to compile a makefile (which, goes by itself it's absurd because 
this kind of architechtures exists from years nowadays).
The point is, an average pc user doesn't have the farthest idea on how to 
compile a makefile scripts and or which are the rules of writing this kind of 
files. An averege pc user doesn't even need the refined technology experience 
that leads most of the time into bugs or lack of software support (sadly not my 
case since using nautilus is a pretty basic task, as using an usbkey). The 
large part of ubuntu's user probably aren't even aware of experiencing bugs 
when they step into one, (an example of that could be the usb transfer speeds, 
which are completely ridiculous, most of all if the transfer to be made is 
between a win filesystem and a linux one) and start complaining about it on the 
ubuntu forum hoping for someone to accidentally crash into a solution (that's 
the case of the usb transfer speed, I could send you links which prove the 
presence of the issue since 7.04). 
Those factors, combined with the fact that the philosophy of free software 
needs the user not only to be a consumer but  to have an active role in the 
developing of the software (philosophy that all of us can see not everybody is 
fully embracing) absence of a pro team working on it for a livin' makes ubuntu 
very slow on dealing with some kind of problems, and saying that it's only a 
half of 1% of the people filing reports does not surprise me, not should you at 
this point, and as I've already pointed out the cause is not always the fact 
that ubuntu is a "rock solid system".

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Chris:

Thank you for all your help!

Azraele:

Do you need any assistance following the instructions Chris provided?

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Chris Coulson]

I've not had a chance to read every comment in this bug in detail yet,
but it seems that the backtraces provided were from running Nautilus
with sudo. There should be no need to do this, and that might be why the
backtrace doesn't show anything useful (if it is your users instance of
Nautilus which has broken, then running a second instance of nautilus
under GDB as a different user won't be much use)

Nautilus will exit if you run a new instance when there is already one
running in your session, so you can't just run "gdb nautilus". You need
to attach GDB to the instance of nautilus which is already running in
your session. The procedure for doing this is documented in
https://wiki.ubuntu.com/Backtrace#Already%20running%20programs

Please try and do this (only when Nautilus is consuming a lot of CPU).
It also helps sometimes to interrupt and obtain a backtrace several
times, to make sure that it is interrupted in roughly the same code path
each time.

** Changed in: nautilus (Ubuntu)
   Status: Triaged => Incomplete

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Chris Coulson]

Thanks for sending upstream Dave. We still keep upstreamed tasks open in
Launchpad though, so I'm reopening the Ubuntu bug

** Changed in: nautilus (Ubuntu)
   Status: Invalid => Triaged

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

I am sorry you feel this way.   Please keep in mind that if we could
reproduce this problem on any other machine then it would be much easier
to resolve and fix.  I have 5 test machines here and none of them,
including my primary machine has ever seen the memory or CPU utilization
you describe.   My girlfriend has 2 laptops and both run Kubuntu.  Her
sister uses Ubuntu.  We all use various bitorrent clients and none of
them have even temporarily demonstrated this problem.  I also feel a bit
obligated to point out that out of 13,000,000 people (and growing) using
any of the *buntu distros; less than 1/2 of 1% have filed a bug report
since Ubuntu's inception.

I personally have contributed at least a couple of hours of my life
(completely unpaid) getting your bug report together.  It has been
forwarded upstream so the people who actually write this particular
software can get a chance to resolve the problem.   You indicated this
has been a problem for about 20 months.  I think it is appropriate to
assume it will take more than 5 days to respond to your bug report.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

I don't wanna be rude but it seems that nobody gives a shxt!! It's obvious that 
free software isn't well developed as the other ones but at least one should 
have good support to fix the unbelievable number of bugs that it has attached..
Plus it seems to be a pretty serious bug since with the nautilus not working, 
it's pretty hard to use the OS..

I'm quite disappointed.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Thank you for your bug report. This bug has been reported to the
developers of the software. You can track it and make comments at:

https://bugzilla.gnome.org/show_bug.cgi?id=604643

** Bug watch added: GNOME Bug Tracker #604643
   https://bugzilla.gnome.org/show_bug.cgi?id=604643

** Also affects: nautilus via
   https://bugzilla.gnome.org/show_bug.cgi?id=604643
   Importance: Unknown
   Status: Unknown

** Changed in: nautilus (Ubuntu)
   Status: Confirmed => Invalid

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

I already posted a screenshot showing both system monitor and top, you can see 
there that clearly it's nautilus the problem.
I don't think it is a thumbnails issue-related because most of the time it goes 
2.2 gigs big and 100% cpu there are no nautilus browser windows opened, it's 
only the desktop process

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

I already post a screenshot showing both system monitor and top, you can see 
there that clearly it's nautilus the problem.
I don't think it is a thumbnails issue-related because most of the time it goes 
2.2 gigs big and 100% cpu there are no nautilus browser windows opened, it's 
only the desktop process

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Sebastien Bacher]

do you get the issue if your turn thumbnailing off in the nautilus
options?

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Sebastien Bacher]

the stracktrace there seems to indicate nautilus is in its idle loop and
it should be using any cpu, are you sure the cpu use is due to nautilus?

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Here we go.

If you push it upstream I'll be tankful! Send us the link


** Attachment added: "gdb-nautilus.txt"
   http://launchpadlibrarian.net/36812967/gdb-nautilus.txt

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

Would you feel comfortable installing libglib2.0-0-dbg and
libgtk2.0-0-dbg and repeating the debug process?   If so then I will be
happy to push it upstream for you.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Sebastien Bacher]

the current stacktrace is useless since it has no symbols,
libglib2.0-0-dbg and libgtk2.0-0-dbg should be installed, would also be
useful if somebody having the issue send the bug upstream since it seems
to happen to very few users and could be configuration specific

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Sebastien Bacher]

The issue is an upstream one and it would be nice if somebody having it
could send the bug the to the people writting the software
(https://wiki.ubuntu.com/Bugs/Upstream/GNOME)

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

Please keep in mind I am only a volunteer triager.

I am going to mark the bug confirmed and hopefully the backtrace will
help a developer isolate the cause and find a solution. If not then
please do not be upset if the status is returned to "incomplete" with a
request for additional information.

Thanks for reporting this bug and any supporting documentation. Since
this bug has enough information provided for a developer to begin work,
I'm going to mark it as confirmed and let them handle it from here.
Thanks for taking the time to make Ubuntu better!

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Thanks for reporting this bug and any supporting documentation. Since
this bug has enough information provided for a developer to begin work,
I'm going to mark it as confirmed and let them handle it from here.
Thanks for taking the time to make Ubuntu better!

** Changed in: nautilus (Ubuntu)
   Status: Incomplete => Confirmed

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Ok, I think I made it: perhaps I left it open for too much time, but the
output is recursive so I think it's probably useful, you let me know.

** Attachment added: "backtrace.txt"
   http://launchpadlibrarian.net/36773129/backtrace.txt

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Okay..   Clearly the documentation is a bit lacking so lets try creating
on our own.

sudo gdb nautilus 2>&1 | tee ~/gdb-nautilus.txt

.. should produce "Reading symbols from /usr/bin/nautilus...(no
debugging symbols found)...done."   Now type "quit" then press RETURN or
ENTER so we exit gdb.

Now try this:

sudo apt-get update
sudo apt-get install nautilus-dbg 
sudo apt-get install libgnome-desktop*
sudo killall nautilus
sudo gdb nautilus 2>&1 | tee ~/gdb-nautilus.txt

You should see gdb load and it finds the debug symbols:

"Reading symbols from /usr/lib/debug/usr/bin/nautilus...done.
(gdb) "

Now.. from the gdb prompt..

(gdb) exec-file /usr/bin/nautilus
(gdb) symbol-file /usr/lib/debug/usr/bin/nautilus
Load new symbol table from "/usr/lib/debug/usr/bin/nautilus"? (y or n) y
Reading symbols from /usr/lib/debug/usr/bin/nautilus...done.
(gdb) handle SIG33 pass nostop noprint
SignalStop  Print   Pass to program Description
SIG33 NoNo  Yes Real-time event 33
(gdb) set pagination 0
(gdb) run

Nautilus should load.  Leave it open for a bit and confirm it is still
growing in size.   At some point close the window.   Then hold down the
CTRL button and press C to terminate gdb debugging because it will
probably fail to terminate on its own.  (Make sure you are inside the
gdb terminal window when you press CTRL-C).

You should see something like..

Program received signal SIGINT, Interrupt.
0x00b54422 in __kernel_vsyscall ()
(gdb) 

Now..

(gdb) backtrace full
(gdb) info registers
(gdb) x/16i $pc
(gdb) thread apply all backtrace
(gdb) quit
A debugging session is active.

Inferior 1 [process 8089] will be killed.

Quit anyway? (y or n) y

Once this is done you should attach the resulting gdb-nautilus.txt.
Hopefully that will be everything we need.

Please attach an updated moves.txt if you run into problems.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

I'm sorry man, in my country it was 3 a.m. when I tried to install it, I wasn't 
that much careful.
I see what I did wrong, I installed the correct debug symbols but it still says 
I don't have any! Watch by yourself.

** Attachment added: "moves2.txt"
   http://launchpadlibrarian.net/36740566/moves2.txt

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

Good..   I reviewed your moves.txt and here is where the problem begins:

alexand...@alexandros-desktop:~$ apt-cache policy yelp

This documentation:

https://wiki.ubuntu.com/DebuggingProgramCrash

States:

"Remember that 'yelp' [which is the package name of "Help and Support"
located under the 'System' menu] is just an example and not a part of
the command. It is just used to demonstrate the procedure. You will have
to replace 'yelp' with the name of the package you want to debug. "

In your case the command "apt-cache policy yelp" should have been "apt-
cache policy nautilus"  (since Nautilus is the thread  consuming an
exceptional amount of CPU).   You should also replace "yelp" with
"nautilus" in the subsequent commands where necessary.The rest looks
good.   Just start at "apt-cache policy yelp", post your updated console
log and your new backtrace.

Glad you followed-up.  Keep working on it.   We'll get there..

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Here's the moves I made, you let me know if I made something wrong.

** Attachment added: "moves.txt"
   http://launchpadlibrarian.net/36733210/moves.txt

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Man I'm gettin' a little nervous here. I followed your instructions move by 
move. As a matter of fact I copied every single command and inserted it in the 
terminal in the ordinated fashion you gave me. I even checked again if 
nautilus-dbg was installed, and it is.
But still I get that the debug symbols are missing.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

Thank you for taking the time to report this bug and helping to make
Ubuntu better.

The backtrace indicates you failed to install debugging symbols as per
the documentation provided.

"Reading symbols from /usr/bin/nautilus...Reading symbols from 
/usr/lib/debug/usr/bin/nautilus...done.
(no debugging symbols found)...done."

If you fail to carefully follow the instructions shown in the
documentation then any resulting backtrace will fail to provide the
necessary information needed to track down this bug.   Please try to
obtain a backtrace following the instructions at
http://wiki.ubuntu.com/DebuggingProgramCrash and upload the backtrace
(as an attachment) to the bug report. This will greatly help us in
tracking down your problem.

If you are unsure about any specific step then proceed as far as
possible while capturing your terminal buffer to a text file.  This will
help us isolate any failures in the documentation that may be preventing
you from capturing an useful backtrace.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Here's the result of the backtrace I ran while nautilus was overloaded.

** Attachment added: "gdb-nautilus.txt"
   http://launchpadlibrarian.net/36714023/gdb-nautilus.txt

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

The thing I don't understand it's why they asked me to do this. Nautilus
does not crash: it devours all the system resources, but it works on.
The fact that it doesn't crash while using 2.2 gigs of memory does not
make it less of a problem. I don't really know if the debug will be of
any help. However I'll let it overload as usual then run gdb and post
the output.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

Lets go through this step-by-step because I am not confident I fully
understand what you have done so far.

First..   Have you issued these commands from the command line:

1)
echo "deb http://ddebs.ubuntu.com $(lsb_release -cs) main restricted universe 
multiverse" | sudo tee -a /etc/apt/sources.list.d/ddebs.list
2)
echo "deb http://ddebs.ubuntu.com $(lsb_release -cs)-updates main restricted 
universe multiverse 
deb http://ddebs.ubuntu.com $(lsb_release -cs)-security main restricted 
universe multiverse
deb http://ddebs.ubuntu.com $(lsb_release -cs)-proposed main restricted 
universe multiverse" |
sudo tee -a /etc/apt/sources.list.d/ddebs.list
3)
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 428D7C01 5E0577F2
4)
gpg -o - --export 428D7C01 | sudo apt-key add -
5)
sudo apt-get update
6)
sudo apt-get install nautilus-dbg



If you entered command #1 and #2 correctly then entering this command:

cat /etc/apt/sources.list.d/ddebs.list

Should provide these results:

deb http://ddebs.ubuntu.com karmic main restricted universe multiverse
deb http://ddebs.ubuntu.com karmic-updates main restricted universe multiverse
deb http://ddebs.ubuntu.com karmic-security main restricted universe multiverse
deb http://ddebs.ubuntu.com karmic-proposed main restricted universe multiverse



If you entered command #3 correctly then you should see a message saying
you imported 2 keys successfully.   If you entered command #4 correctly
then it should simply respond with "OK".   Command #5 and #6 should
complete without errors.



Let me know if you make it this far.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Is anybody out there???

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

I made it work using the sudo prefix, but it still gives me this error:

This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
...
Reading symbols from /usr/bin/nautilus...(no debugging symbols found)...done.

probably because of the missing signatures that I posted before. I' ll post the 
debug files that It as given me.
If you'll provide me with good debug symbol archive signing keys I'll provide 
you more valuable infos.

** Attachment added: "gdb-nautilus.txt"
   http://launchpadlibrarian.net/36630688/gdb-nautilus.txt

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

and when I give the debug symbol archive signing key:

gpg --keyserver keyserver.ubuntu.com --recv-key 428D7C01 5E0577F2
gpg --check-sigs 428D7C01 # signed by key of Martin Pitt
gpg -o - --export 428D7C01 | sudo apt-key add -

It gives me as output:

2 signatures not checked due to missing keys

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

When I use gdb following this procedure:

Start gdb:
gdb 2>&1 | tee gdb-.txt
(gdb) handle SIG33 pass nostop noprint
(gdb) set pagination 0
(gdb) attach 
(If the program is running as root, use sudo gdb instead of just gdb above.)
Continue the :
(gdb) continue
The program will continue running. Perform any actions necessary to reproduce 
the crash. If the program hangs but doesn't crash you can press ctrl+c in gdb 
while the program is frozen and then continue with the next step.

When I give the command continue, in the system monitor nautilus is "stopped" 
(that's what's written in the cpu % value),
and if I go back to gdb pressing cntrl+c to start the debug it gives me:
this sign:
^C
and does not responds to any of my commands...

Help would be appreciated

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Pedro Villavicencio]

Please try to obtain a backtrace of that  following the instructions at
http://wiki.ubuntu.com/DebuggingProgramCrash and upload the backtrace
(as an attachment) to the bug report. This will greatly help us in
tracking down your problem.

** Changed in: nautilus (Ubuntu)
   Status: Confirmed => Incomplete

** Changed in: nautilus (Ubuntu)
 Assignee: (unassigned) => Ubuntu Desktop Bugs (desktop-bugs)

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Well I can say the concern is appreciated nonetheless. Let's hope then
that the A-class developer find a solution to this problem, It's quite
serious and a good os should not have to face something like that I
fear.

After all I think that this one, and the usb transfer speed are the two
major problems of this nice free software, have the two of 'em nailed
would remarkably improve the quality of the ubuntu experience.

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

Please keep in mind I am only a volunteer triager with a love for Ubuntu
and free software which is half a star-system away from a good
developer.

I am going to mark the bug confirmed and hopefully the strace will help
a developer isolate the cause and find a solution.   If not then please
do not be upset if the status is returned to "incomplete" with a request
for additional information.

Thanks for reporting this bug and any supporting documentation. Since
this bug has enough information provided for a developer to begin work,
I'm going to mark it as confirmed and let them handle it from here.
Thanks for taking the time to make Ubuntu better!


** Changed in: nautilus (Ubuntu)
   Status: Incomplete => Confirmed

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Here the strace file my man. Show the world what it means to be ubuntu
programmer!

** Attachment added: "Strace.rar"
   http://launchpadlibrarian.net/36574399/Strace.rar

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Pedro Villavicencio]

** Changed in: nautilus (Ubuntu)
   Importance: Undecided => Medium

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

How do I stop strace? the log has reached 900 MB I think it's enough.
Even because the size of nautilus is approx 1300 MB so you should be
able to see what is the problem in the log..

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

:D :D sorry

I'll leave it open with strace and post the results

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

I am assuming you are actually typing:

strace -Ff -tt -p 14226 2>&1 | tee strace-nautilus.log

and not:

strace -Ff -tt -p <14226> 2>&1 | tee strace-.log

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Azraele]

Well I'll do my best to find a procedure but the strange thing is that i
don't have really to do anything to make the problem happen, in fact
yesterday I killed nautilus (because of the unbelievable size) then I
started it again (since to have a nautilus process I don't really need
to open a file browsing window, I have one since the system boot, it's
the desktop one i think, problem is when I boot it is 24 megs big and
then it starts growing like a pie) and left it opened overnight with
ktorrent downloading. Since I am the only user of the pc, I can solidly
state that nobody touched it all the night: without any action it grows
by himself. Nonetheless I will left it opened with strace, problem is
when i give the command :

strace -Ff -tt -p <14226> 2>&1 | tee strace-.log

where 14226 is the process id it gives me this output:

bash: syntax error near unexpected token `14226'

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[Bug 492810] Re: Nautilus uses 100% cpu after downloading torrent

[Dave Walker]

Azraele:

Could you also obtain an strace of Nautilus after it has spiked to 100%?

1 - Make sure strace is installed.

  apt-get install strace

2 - Find the process ID of :

  pidof nautilus

3 - Start strace with the process ID:

  strace -Ff -tt -p  2>&1 | tee strace-.log

4 - Perform any actions necessary to reproduce the bug.  
5 - You may have to hit Control-C to get strace to detach from a running 
program.
6 - Attach the complete output from strace, contained in strace-.log, 
in your bug report.

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[Bug 492810] Re: Nautilus uses 100% cpu

[Dave Walker]

Azraele:

I am very sorry for doubting you.   You are correct and your concerns
are valid.   Do you have any other thoughts on how to reproduce the
problem?   Is Nautilus launching on its own and spiking to 100% while
downloading?  after the downloads are complete?  Are you opening
Nautilus to browse the folders where the torrents are being stored when
the problem occurs?

We will need to figure out the steps necessary to recreate the problem
before we can confirm the bug.  Once I can recreate the problem then it
will become very easy to reproduce and get it fixed.   Any help you can
provide to get us there would be appreciated.

** Summary changed:

- Nautilus uses 100% cpu
+ Nautilus uses 100% cpu after downloading torrent

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[Bug 492810] Re: Nautilus uses 100% cpu

[Azraele]

Well the problem is a have 4 gigs of memory, and as you can see in my
screenshot my system has never used since i built it any swap memory.
The second point is that nautilus is using 2.2 gigs of memory: isn't
that unusual that with only one nautilus window opened it is using so
much memory? and then again: how can it use 100% cpu? you can see it in
the screenshot too! of course my processor doesn't get stuck because it
has 4 cores, which are pretty difficult to get stuck altogheter since
their used to multitask different process simultaneously and never use 4
cores for one process, but if it were the case my cpu would be stuck
with this stats: seems a problem to me but maybe i'm wrong..

** Attachment added: "Screenshot-1.png"
   http://launchpadlibrarian.net/36524977/Screenshot-1.png

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[Bug 492810] Re: Nautilus uses 100% cpu

[Dave Walker]

I fully understand.   Does your machine respond normally?   If your CPU
was truly pegged at 100% then your machine would be completely unusable.
You would not be able to launch Firefox, Nautilis or much of anything.
It is possible the applet is reporting inaccurate data or it is being
mis-read.   Could you post a screenshot of the utility where it shows
your machine is consuming 100% of the CPU?Just press the PRINT
SCREEN button your keyboard, save the screen print to disk then attach
it to this bug report.   Make sure there is no private data on your
screen before taking the screen print.

Are you comfortable accessing the console?  If so then I can walk you
through confirming your system is using 100% of the cpu.

The RAM consumption is completely normal for both Windows and Linux.  I
am attaching a screenshot of a pretty standard Windows performance
monitor.  In this case, even with moderate use, a Windows Vista consumes
about 1.2GB of RAM and Windows 7 consumes even more.   The reason why
your system appears to use 876MB (which is a pretty small number) is
because most of that is used by your swap partition.

There are 2 reasons why data is swapped to disk. First, when the system
requires more memory than is physically available, the kernel swaps out
less used pages and gives memory to the current application (process)
that needs the memory immediately.  This is unlikely in your case
because you have enough RAM available.   Second, a significant number of
the pages used by an application during its startup phase may only be
used for initialization and then never used again. The system can swap
out those pages and free the memory for other applications or even for
the disk cache.  If your system is loaded long enough then eventually
that data will be garbage collected freeing up space for other data.
If you have enough RAM then that data may be stored in your swap
partition for days, weeks, months or years assuming your machine is
never rebooted.

I hope this helps.


** Attachment added: "Windows Performance Tab"
   http://launchpadlibrarian.net/36507451/WindowsPerformanceTab.jpg

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[Bug 492810] Re: Nautilus uses 100% cpu

[Azraele]

First o f all the distro I am using is ubuntu 9.10, with the latest
kernel and updates. I opended ktorrent, and left it opened overnight
downloading as usual. I use nautilus as everybody does, moving though
dirs moving files (usually large ones): but i am a bit chaotic  that's
why I open lots of nautilus windows, which it's what made me notice that
the nautilus was slowing down. So I closed all the windows opened but
from the system monitor applet i noticed the cpu was stuck at 100%. The
following morning doing the same thing I noticed that when I opened a
new nautilus window or broswed an internet page with many flash video
the nautilus size increased drastically: the problem is when I closed
firefox or the file browser the memory usage of the nautilus process (
of course i monitored this with system monitor too) did not decrease as
expect but kept the same size: obviously with this behavior the process
size increased every time I used something related to it reaching the
unbeliavable size this morning of 1.7 gigs.

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[Bug 492810] Re: Nautilus uses 100% cpu

[Dave Walker]

Greetings,

I am happy to help!Could you please tell me how you concluded
Nautilus is consuming 100% of the CPU and 876MB of RAM for some period
of time?   I need the specific steps you took to recreate this problem
so I can reproduce this problem.

You may find it helpful to read "How to report bugs effectively"
http://www.chiark.greenend.org.uk/~sgtatham/bugs.html. We'd be grateful
if you would then provide a more complete description of the problem.

We have instructions on debugging some types of problems at
http://wiki.ubuntu.com/DebuggingProcedures

At a minimum, we need:
1. the specific steps or actions you took that caused you to encounter the 
problem,
2. the behavior you expected, and
3. the behavior you actually encountered (in as much detail as possible).
Thanks! 


** Changed in: nautilus (Ubuntu)
   Status: New => Incomplete

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[Bug 492810] Re: Nautilus uses 100% cpu

[Azraele]

I've just noticed that with no nautilus windows open it is using 876
Megs of memory wich is just too much, even vista uses less memory!!! and
I am quite certain that the memory use will increase since when
yesterday it started using 100% cpu ubunutu was using 2.0 Gigs of
memory, which of course with only ktorrent open is too much.

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