[Bug 185265] New: digikam constantly using some CPU in a poll loop due a timeout

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[Bug 185265] New: digikam constantly using some CPU in a poll loop due a timeout

Bugzilla from rfkd@fietze-home.de
https://bugs.kde.org/show_bug.cgi?id=185265

           Summary: digikam constantly using some CPU in a poll loop due a
                    timeout
           Product: digikam
           Version: 0.10.0-rc2
          Platform: SuSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           0.10.0-rc2 (using KDE 4.2.0)
OS:                Linux
Installed from:    SuSE RPMs

Not really a "problem", but on my box digikam constantly uses 3-4% CPU doing
the following (not yet knowing where the socket on fd 7 is connected to):

19:30:10.126461 clock_gettime(CLOCK_MONOTONIC, {19813, 484402342}) = 0
19:30:10.126781 read(7, 0x839c12c, 4096) = -1 EAGAIN (Resource temporarily
unavailable)
19:30:10.127067 clock_gettime(CLOCK_MONOTONIC, {19813, 484971193}) = 0
19:30:10.127384 clock_gettime(CLOCK_MONOTONIC, {19813, 485290769}) = 0
19:30:10.127671 clock_gettime(CLOCK_MONOTONIC, {19813, 485580140}) = 0
19:30:10.127946 clock_gettime(CLOCK_MONOTONIC, {19813, 485852554}) = 0
19:30:10.128213 read(7, 0x839c12c, 4096) = -1 EAGAIN (Resource temporarily
unavailable)
19:30:10.128488 poll([{fd=3, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7,
events=POLLIN}, {fd=9, events=POLLIN}, {fd=10, events=POLLIN}, {fd=13,
events=POLLIN}], 6, 195) = 0 (Timeout)
19:30:10.326444 clock_gettime(CLOCK_MONOTONIC, {19813, 684371803}) = 0
19:30:10.326747 read(7, 0x839c12c, 4096) = -1 EAGAIN (Resource temporarily
unavailable)
19:30:10.327032 clock_gettime(CLOCK_MONOTONIC, {19813, 684936847}) = 0
19:30:10.327341 clock_gettime(CLOCK_MONOTONIC, {19813, 685250711}) = 0
19:30:10.327630 clock_gettime(CLOCK_MONOTONIC, {19813, 685535629}) = 0
19:30:10.327902 clock_gettime(CLOCK_MONOTONIC, {19813, 685810948}) = 0
19:30:10.328171 read(7, 0x839c12c, 4096) = -1 EAGAIN (Resource temporarily
unavailable)
19:30:10.328444 poll([{fd=3, events=POLLIN}, {fd=8, events=POLLIN}, {fd=7,
events=POLLIN}, {fd=9, events=POLLIN}, {fd=10, events=POLLIN}, {fd=13,
events=POLLIN}], 6, 195) = 0 (Timeout)

This is a 2x500MHz SMP box. I would assume when using digikam on something
small as a netbook, or multiple times on an application server (at home I use
this SMP box for up to three desktops), this should or could be reduced.

Therefore I rated this an enhancement, not really a bug.

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Gilles Caulier-4
https://bugs.kde.org/show_bug.cgi?id=185265





--- Comment #1 from Gilles Caulier <caulier gilles gmail com>  2009-02-22 19:52:03 ---
Can you identify which process use this cpu ?

digiKam provide also kioslave to play with SQlite database. there are separated
process, because SQlite cannot be use with multithreading.

Also, we need to know in which conditions/action in digiKam the cpu is
consumed.

Gilles Caulier

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Bugzilla from rfkd@fietze-home.de
In reply to this post by Bugzilla from rfkd@fietze-home.de
https://bugs.kde.org/show_bug.cgi?id=185265





--- Comment #2 from Roman Fietze <rfkd fietze-home de>  2009-02-22 20:34:02 ---
(In reply to comment #1)

> Can you identify which process use this cpu ?

Seems to be a thread of the originally started process. Strace shows e.g the
following lines:

15685 <first line in strace output, the original process>
...
15685 20:17:22.664063 clone(child_stack=0xade46474,
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT
_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0xade46bd8, {entry_number:6,
base_addr:0xade46b90, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0,
limit_in_pages:1, seg_not_present:0, useable:1}, child_tidptr=0xade46bd8) =
15695
...
15685 20:25:58.280403 clock_gettime(CLOCK_MONOTONIC,  <unfinished ...>
15695 20:25:58.280535 <... futex resumed> ) = 0
15685 20:25:58.280649 <... clock_gettime resumed> {23161, 638303372}) = 0
15695 20:25:58.280870 clock_gettime(CLOCK_MONOTONIC,  <unfinished ...>
15685 20:25:58.280994 clock_gettime(CLOCK_MONOTONIC,  <unfinished ...>
15695 20:25:58.281125 <... clock_gettime resumed> {23161, 638786876}) = 0
15685 20:25:58.281264 <... clock_gettime resumed> {23161, 638893226}) = 0
15695 20:25:58.281464 clock_gettime(CLOCK_MONOTONIC,  <unfinished ...>
15685 20:25:58.281589 clock_gettime(CLOCK_MONOTONIC,  <unfinished ...>
15695 20:25:58.281720 <... clock_gettime resumed> {23161, 639382182}) = 0
15685 20:25:58.281857 <... clock_gettime resumed> {23161, 639488045}) = 0
15695 20:25:58.282046 clock_gettime(CLOCK_MONOTONIC,  <unfinished ...>
15685 20:25:58.282169 clock_gettime(CLOCK_MONOTONIC,  <unfinished ...>
15695 20:25:58.282299 <... clock_gettime resumed> {23161, 639963573}) = 0
15685 20:25:58.282437 <... clock_gettime resumed> {23161, 640067675}) = 0
15695 20:25:58.282616 gettimeofday( <unfinished ...>
15685 20:25:58.282738 read(7,  <unfinished ...>
15695 20:25:58.282873 <... gettimeofday resumed> {1235330758, 282723}, NULL) =
0
15685 20:25:58.283012 <... read resumed> 0x839c124, 4096) = -1 EAGAIN (Resource
temporari
ly unavailable)
15695 20:25:58.283182 clock_gettime(CLOCK_REALTIME,  <unfinished ...>
15685 20:25:58.283337 poll([{fd=3, events=POLLIN}, {fd=8, events=POLLIN},
{fd=7, events=P
OLLIN}, {fd=9, events=POLLIN}, {fd=10, events=POLLIN}, {fd=11, events=POLLIN},
{fd=35, ev
ents=POLLIN}, {fd=33, events=POLLIN}, {fd=34, events=POLLIN}, {fd=32,
events=POLLIN}, {fd
=39, events=POLLIN}], 11, 191 <unfinished ...>
15695 20:25:58.283692 <... clock_gettime resumed> {1235330758, 283317687}) = 0
...
... <forever>

PID 15685 is the originally started process with the executable digikam. Top
also show PID 15685 as the process using the CPU, I do not (yet) know which one
of the two threads use that CPU, 15685  or 15695.

> Also, we need to know in which conditions/action in digiKam the cpu is
> consumed.

The system is completely idle, esp. I waited quite some while after I accessed
any file, even if it was just to read it (a "sitecopy --update ..."). Digikam
is showing a completely empty directory (my "incoming" directory AAA-Temp)
while the strace was taken.

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Bugzilla from andi.clemens@gmx.net
In reply to this post by Bugzilla from rfkd@fietze-home.de
https://bugs.kde.org/show_bug.cgi?id=185265





--- Comment #3 from Andi Clemens <andi clemens gmx net>  2009-02-22 21:04:51 ---
I get million of those messages, too. Even in showFoto... something is polling
like crazy. I checked other apps that use dirwatch and such stuff, they all are
quiet. But showFoto and digikam constantly are talking to someone, I get 10
messages per second.

read(8, "\1\0F\6\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\30\0\0\0e\n\0\0"...,
4096) = 32
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
clock_gettime(CLOCK_MONOTONIC, {12124, 465636003}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 472280283}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 478896207}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 485614798}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 492279960}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 498894486}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 505616010}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 512281661}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 518898283}) = 0
clock_gettime(CLOCK_MONOTONIC, {12124, 525616803}) = 0
gettimeofday({1235332748, 285342}, NULL) = 0
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
select(9, [8], [8], NULL, NULL)         = 1 (out [8])
writev(8, [{"\22\0\6\0\30\0@\3\25\1\0\0\4\0\0\0
\0\0\0\0\0\0\0\233\24%\0\243\0@\3\1"..., 5116}, {NULL, 0}, {""..., 0}], 3) =
5116
read(8,
"\34yG\6\30\0@\3\25\1\0\0\210\1\271\0\0\264\331\277\352\n\t\10\330\264\331\277\30\0@\3\34"...,
4096) = 64
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
gettimeofday({1235332748, 338660}, NULL) = 0
select(9, [8], [8], NULL, NULL)         = 1 (out [8])
writev(8, [{"+\0\1\0"..., 4}, {NULL, 0}, {""..., 0}], 3) = 4
select(9, [8], [], NULL, NULL)          = 1 (in [8])
read(8,
"\1\1j\6\0\0\0\0\1\0\340\1\0\0\0\0\4\0\0\0d\n\0\0\350\n\22\n\0\0\0\0"..., 4096)
= 32
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
gettimeofday({1235332748, 405322}, NULL) = 0
select(9, [8], [8], NULL, NULL)         = 1 (out [8])
writev(8, [{"+\0\1\0"..., 4}, {NULL, 0}, {""..., 0}], 3) = 4
select(9, [8], [], NULL, NULL)          = 1 (in [8])
read(8,
"\1\1k\6\0\0\0\0\1\0\340\1\0\0\0\0\4\0\0\0d\n\0\0\350\n\22\n\0\0\0\0"..., 4096)
= 32
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
gettimeofday({1235332748, 471934}, NULL) = 0
select(9, [8], [8], NULL, NULL)         = 1 (out [8])
writev(8, [{"+\0\1\0"..., 4}, {NULL, 0}, {""..., 0}], 3) = 4
select(9, [8], [], NULL, NULL)          = 1 (in [8])

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Bugzilla from andi.clemens@gmx.net
In reply to this post by Bugzilla from rfkd@fietze-home.de
https://bugs.kde.org/show_bug.cgi?id=185265





--- Comment #4 from Andi Clemens <andi clemens gmx net>  2009-02-22 21:08:22 ---
Created an attachment (id=31554)
 --> (http://bugs.kde.org/attachment.cgi?id=31554)
complete output when starting showFoto

This file shows all the output. There are strange messages when showFoto tries
to read files like

access("/home/andi/.kde4/share/locale/en_US/LC_SCRIPTS/digikamimageplugin_inserttext/digikamimageplugin_inserttext.js",
R_OK) = -1 ENOENT (No such file or directory)

or

access("/home/andi/.kde4/share/locale/en_US/LC_SCRIPTS/digikamimageplugin_oilpaint/digikamimageplugin_oilpaint.js",
R_OK) = -1 ENOENT (No such file or directory)

Is this normal? There are thousands of such messages...

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Marcel Wiesweg
In reply to this post by Bugzilla from rfkd@fietze-home.de
https://bugs.kde.org/show_bug.cgi?id=185265


Marcel Wiesweg <[hidden email]> changed:

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--- Comment #5 from Marcel Wiesweg <marcel wiesweg gmx de>  2009-02-22 21:26:43 ---
I set a breakpoint on read():

#0  0x00007ffff1977830 in read () from /lib64/libpthread.so.0
#1  0x00007fffea394400 in ?? () from /usr/lib64/libxcb.so.1
#2  0x00007fffea3948b8 in xcb_poll_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007fffefcde8b5 in ?? () from /usr/lib64/libX11.so.6
#4  0x00007fffefcdeff6 in _XEventsQueued () from /usr/lib64/libX11.so.6
#5  0x00007fffefcb0634 in XCheckWindowEvent () from /usr/lib64/libX11.so.6
#6  0x00007fffde15196b in ?? () from
/usr/lib64/gstreamer-0.10/libgstximagesink.so
#7  0x00007fffed2a0764 in ?? () from /usr/lib64/libglib-2.0.so.0
#8  0x00007ffff1971070 in start_thread () from /lib64/libpthread.so.0
#9  0x00007ffff0f6a10d in clone () from /lib64/libc.so.6
#10 0x0000000000000000 in ?? ()

which seems to be from phonon/gstreamer.

A breakpoint on poll() is always caught by Qt's/glib's event loop. I believe
that is normal.

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

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https://bugs.kde.org/show_bug.cgi?id=185265





--- Comment #6 from Andi Clemens <andi clemens gmx net>  2009-02-22 21:31:08 ---
So phonon is making that noise? Then amarok should do this output, too... I'll
check...

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Bugzilla from andi.clemens@gmx.net
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https://bugs.kde.org/show_bug.cgi?id=185265





--- Comment #7 from Andi Clemens <andi clemens gmx net>  2009-02-22 21:33:45 ---
Amarok behaves the same, but without those error messages from my comment #3:

read(8, 0x98eda18, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)

Question is why? Have we initialized something different?

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Gilles Caulier-4
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https://bugs.kde.org/show_bug.cgi?id=185265





--- Comment #8 from Gilles Caulier <caulier gilles gmail com>  2009-06-03 08:01:36 ---
If this entry is relevant of Phonon, please move it on right B.K.O component...

Gilles

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Gilles Caulier-4
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----------------------------------------------------------------------------
            Version|0.10.0-rc2                  |0.10.0




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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

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--- Comment #9 from Roman Fietze <rfkd fietze-home de>  2009-09-03 21:26:27 ---
This is still true for digikam Version 0.10.0 using KDE 4.3.1 release 163.

Interesting is, that other KDE 4 applications do not use some CPU when they are
idle, even applications that could eventually use the sound system, e.g. amarok
2.

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

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--- Comment #10 from Stefan Fleiter <stefan fleiter web de>  2009-10-16 21:17:55 ---
Still true for Version 1.0.0-beta5.
Amarok only uses some CPU while not playing audio after it has played audio
once.
This is tracked in phonon bug 204114.
But digikam is causes a lot of wakeups and thereby uses a lot of
cpu and power without playing audio once. So there does seem
to be another bug there.

This shortens battery lifetime for notebooks and netbooks considerably
and thus makes digikam not very well suited for mobile presentations
of photos.

See following powertop output:

PowerTOP 1.11   (C) 2007, 2008 Intel Corporation                                

Collecting data for 15 seconds


Cn                Avg residency
C0 (cpu running)        ( 1.5%)
polling           0.0ms ( 0.0%)
C1 mwait          0.0ms ( 0.0%)
C2 mwait          0.1ms ( 0.0%)
C4 mwait          6.4ms (98.5%)
P-states (frequencies)        
  2.21 Ghz     0.1%            
  2.21 Ghz     0.0%            
  1.60 Ghz     0.0%            
  1200 Mhz     0.1%            
   800 Mhz    99.8%            
Wakeups-from-idle per second : 153.5    interval: 15.0s
no ACPI power usage estimate available                
Top causes for wakeups:                                
  46.1% (106.1)           digikam : hrtimer_start_range_ns (hrtimer_wakeup)
  24.1% ( 55.5)       <interrupt> : extra timer interrupt                  
   8.2% ( 18.8)       <interrupt> : ahci                                    
   5.1% ( 11.8)     <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
   4.3% (  9.8)       <interrupt> : ata_piix                                  
   3.5% (  8.0)     <kernel core> : usb_hcd_poll_rh_status (rh_timer_func)    
   2.8% (  6.3)      <kernel IPI> : Rescheduling interrupts                  
   1.6% (  3.7)     <kernel core> : hrtimer_start (tick_sched_timer)          
   0.9% (  2.0)       <interrupt> : nvidia                                    
   0.5% (  1.2)    plasma-desktop : hrtimer_start_range_ns (hrtimer_wakeup)  
   0.4% (  1.0)     <kernel core> : add_timer (tg3_timer)                    
   0.4% (  1.0)     <kernel core> : nv_kern_rc_timer (nv_kern_rc_timer)      
   0.2% (  0.5)          kwalletd : hrtimer_start_range_ns (hrtimer_wakeup)  
   0.2% (  0.5)               gpm : hrtimer_start_range_ns (hrtimer_wakeup)  
   0.2% (  0.4)          lancelot : hrtimer_start_range_ns (hrtimer_wakeup)  
   0.2% (  0.4)   hald-addon-stor : hrtimer_start_range_ns (hrtimer_wakeup)  
   0.2% (  0.4)             spamd : hrtimer_start_range_ns (hrtimer_wakeup)  
   0.1% (  0.3)     <kernel core> : neigh_periodic_timer (neigh_periodic_timer)
   0.1% (  0.3)           konsole : neigh_periodic_timer (neigh_periodic_timer)
   0.1% (  0.2)           konsole : hrtimer_start_range_ns (hrtimer_wakeup)    
   0.1% (  0.2)           dolphin : hrtimer_start_range_ns (hrtimer_wakeup)    
   0.1% (  0.2)           pdflush : wb_kupdate (wb_timer_fn)                    
   0.1% (  0.1)     <kernel core> : inet_twdr_hangman (inet_twdr_hangman)      
   0.1% (  0.1)   hald-addon-stor : blk_add_timer (blk_rq_timed_out_timer)      
   0.1% (  0.1)           pdflush : add_timer (commit_timeout)                  
   0.1% (  0.1)       ksoftirqd/0 : add_timer (sta_info_cleanup)                
   0.1% (  0.1)           kcryptd : blk_plug_device (blk_unplug_timeout)        
   0.1% (  0.1)             kded4 : hrtimer_start_range_ns (hrtimer_wakeup)    
   0.1% (  0.1)           krunner : hrtimer_start_range_ns (hrtimer_wakeup)    
   0.0% (  0.1)       <interrupt> : PS/2 keyboard/mouse/touchpad                
   0.0% (  0.1)              Xorg : hrtimer_start_range_ns (hrtimer_wakeup)    
   0.0% (  0.1)              bash : start_rt_bandwidth (sched_rt_period_timer)  
   0.0% (  0.1)    btrfs-submit-0 : worker_loop (process_timeout)              
   0.0% (  0.1)          events/0 : queue_delayed_work (delayed_work_timer_fn)  
   0.0% (  0.1)        kjournald2 : blk_add_timer (blk_rq_timed_out_timer)      
   0.0% (  0.1)         ssh-agent : hrtimer_start_range_ns (hrtimer_wakeup)    
   0.0% (  0.1)    NetworkManager : hrtimer_start_range_ns (hrtimer_wakeup)    
   0.0% (  0.1)              Xorg : add_timer (peer_check_expire)

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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Gilles Caulier-4
In reply to this post by Bugzilla from rfkd@fietze-home.de
https://bugs.kde.org/show_bug.cgi?id=185265


Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |KDE platform plugin
            Version|0.10.0                      |unspecified
            Product|digikam                     |Phonon




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[Bug 185265] digikam constantly using some CPU in a poll loop due a timeout

Gilles Caulier-4
In reply to this post by Bugzilla from rfkd@fietze-home.de
https://bugs.kde.org/show_bug.cgi?id=185265


Gilles Caulier <[hidden email]> changed:

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                 CC|                            |[hidden email]
         AssignedTo|[hidden email]       |[hidden email]




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