[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Vlad Zagorodniy]

https://bugs.kde.org/show_bug.cgi?id=388182

Vlad Zagorodniy  changed:

   What|Removed |Added

 Status|CONFIRMED   |RESOLVED
 Resolution|--- |DUPLICATE

--- Comment #25 from Vlad Zagorodniy  ---


*** This bug has been marked as a duplicate of bug 338489 ***

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Vlad Zagorodniy]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #24 from Vlad Zagorodniy  ---
Git commit 67444e36592e78d46b757a6c72be1d50bdae19e6 by Vlad Zagorodniy.
Committed on 27/05/2019 at 14:30.
Pushed by vladz into branch 'Plasma/5.12'.

[effects/screenshot] Upload data to xpixmap in chunks

Summary:
xcb_put_image doesn't handle big images well. Contrary to XPutImage, the
caller must manually split the data in such a way that each xcb_put_image
request doesn't exceed the maximum request length. Not doing so will result
in libxcb shutting down the connection.
Related: bug 338489

Test Plan: Take a screenshot of an active fullscreen client on a 4K monitor.

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: davidedmundson, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D21370

M  +70   -10   effects/screenshot/screenshot.cpp

https://commits.kde.org/kwin/67444e36592e78d46b757a6c72be1d50bdae19e6

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Vlad Zagorodniy]

https://bugs.kde.org/show_bug.cgi?id=388182

Vlad Zagorodniy  changed:

   What|Removed |Added

 CC||i...@mikelpr.com

--- Comment #23 from Vlad Zagorodniy  ---
*** Bug 407373 has been marked as a duplicate of this bug. ***

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Andrew Crouthamel]

https://bugs.kde.org/show_bug.cgi?id=388182

Andrew Crouthamel  changed:

   What|Removed |Added

 Ever confirmed|0   |1
 Status|UNCONFIRMED |CONFIRMED

--- Comment #22 from Andrew Crouthamel  ---
If anyone is interested, I have a bunch more information in Bug 391118. This
bug is easily reproducible on my HiDPI laptop in X11 (but not Wayland).

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Andrew Crouthamel]

https://bugs.kde.org/show_bug.cgi?id=388182

Andrew Crouthamel  changed:

   What|Removed |Added

 CC||croutham...@gmail.com

--- Comment #21 from Andrew Crouthamel  ---
*** Bug 391118 has been marked as a duplicate of this bug. ***

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=388182

Henrik Fehlauer  changed:

   What|Removed |Added

 CC||rk...@lab12.net

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #20 from Martin Flöser  ---
yeah, that all makes sense. Fullscreenshot is taken in a different way, thus
the request problem is not hit.

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #19 from Altguard  ---
In addition, taking a full screen screenshot of both monitors at once does not
cause any issues - only the window screenshot.

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #18 from Altguard  ---
That just gave me an idea I didn't consider before - resizing the windows. As
it turns out, this isn't just Chromium - after trying multiple applications at
different window sizes, it looks like taking a screenshot of *any* application
past a certain window size causes the crash, and shrinking the chromium window
down allows me to take a screenshot without issues. I always have Chromium
windows open at a larger size than everything else, so I never caught on until
now. My apologies.

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=388182

Martin Flöser  changed:

   What|Removed |Added

  Component|general |effects-various
   Severity|normal  |crash

--- Comment #17 from Martin Flöser  ---
I don't understand what it has to do with Chromium, but in general it seems to
be just too much data to transfer in one X11 set property call.

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #16 from Altguard  ---
Interesting, apparently I can take an active window screenshot of Chromium on
my smaller monitor without any problems. The issue only seems to happen on my
larger main monitor, and it only happens with Chromium. Screenshots of any
other application don't cause the issue, regardless of which monitor I take the
screenshot on.

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #15 from Martin Flöser  ---
Could it be that it only breaks if you screenshot the larger screen or windows
on that screen?

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #13 from Altguard  ---
I tried running that while the problem was active, and I got the output
"Service 'org.kde.KWin' does not exist.", so the output I'm attaching was run
while the problem was not active.

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #14 from Altguard  ---
Created attachment 109827
  --> https://bugs.kde.org/attachment.cgi?id=109827=edit
Output of | qdbus org.kde.KWin /KWin supportInformation

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #12 from Martin Flöser  ---
Could you please post the output of:
qdbus org.kde.KWin /KWin supportInformation

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

Altguard  changed:

   What|Removed |Added

 Attachment #109814|0   |1
is obsolete||

--- Comment #11 from Altguard  ---
Created attachment 109821
  --> https://bugs.kde.org/attachment.cgi?id=109821=edit
Xorg log from  | xdotool key XF86LogGrabInfo

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #10 from Altguard  ---
Ah, I didn't, sorry. However, I have now done it again while the problem was
happening and there still weren't any active grabs listed (I'll attach the new
log, but it's no different as far as I could see).

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #9 from Martin Flöser  ---
There are no active grabs listed. Did you do this command when the problem was
visible?

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #8 from Altguard  ---
Created attachment 109814
  --> https://bugs.kde.org/attachment.cgi?id=109814=edit
Xorg log from  | xdotool key XF86LogGrabInfo

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #7 from Altguard  ---
Ah, my apologies. I forgot all about this after  the holidays. I'll attach the
log now.

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Christoph Feck]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #6 from Christoph Feck  ---
If you can provide the information requested in comment #5, please add it.

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #5 from Martin Flöser  ---
>From the video KWin is not (!) frozen. Compositing is active (we can see that
when moving the konsole window) and rendering continues when entering the
"frozen" state. As rendering is done in the main thread this means that KWin is
not frozen.

To me it looks like something holds either a mouse, keyboard or X-Server grab.

Please use
xdotool key XF86LogGrabInfo

to print the active grabs to /var/log/Xorg.0.log

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #4 from Altguard  ---
Also, it just  crossed my mind to screenshot Chromium after restarting kwin_x11
in konsole, which produces this:

===
$ kwin_x11
QXcbConnection: XCB error: 3 (BadWindow), sequence: 172, resource id: 2097158,
major code: 20 (GetProperty), minor code: 0
OpenGL vendor string:   NVIDIA Corporation
OpenGL renderer string: GeForce GTX 1070/PCIe/SSE2
OpenGL version string:  3.1.0 NVIDIA 387.34
OpenGL shading language version string: 1.40 NVIDIA via Cg compiler
Driver: NVIDIA
Driver version: 387.34
GPU class:  Unknown
OpenGL version: 3.1
GLSL version:   1.40
X server version:   1.19.5
Linux kernel version:   4.14.8
Requires strict binding:no
GLSL shaders:   yes
Texture NPOT support:   yes
Virtual Machine:no
kpluginindex: Not cached "/home/altguard/.local/share/kwin/effects"
kpluginindex: Not cached "/usr/share/kwin/effects"
kf5.kcoreaddons.desktopparser: Property type "Url" is not a known QVariant
type. Found while parsing property definition for "X-KWin-Video-Url" in
"/usr/share/kservicetypes5/kwineffect.desktop"
kpluginindex: Not cached "/usr/local/share/kwin/effects"
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2090, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2092, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2100, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2110, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2111, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2112, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2113, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2114, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2115, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2116, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2117, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2120, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2121, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2122, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 2123, resource id: 0,
major code: 14 (GetGeometry), minor code: 0
kpluginindex: Not cached "/home/altguard/.local/share/kwin/scripts/"
kpluginindex: Not cached "/usr/share/kwin/scripts/"
kpluginindex: Not cached "/usr/local/share/kwin/scripts/"
===

After screenshotting Chromium:

===
The X11 connection broke (error 4). Did the X11 server die?
The X11 connection broke: Maximum allowed requested length exceeded (code 4)
XIO:  fatal IO error 2 (No such file or directory) on X server ":0"
  after 4871 requests (4871 known processed) with 0 events remaining.
$
===

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #3 from Altguard  ---
I'm unclear as  to whether or not you'd like for me to  run gdb on the process
before or after kwin locks, so I tried both.

Trying to run it after locking kwin, I get "ptrace: No such process". After
searching through htop and ksysguard, it seems like the kwin_x11 process is
entirely gone after screenshotting Chromium, and running "kwin_x11" from
konsole actually fixes the problem.

The attached file is from running gdb while kwin is still working properly
(Which I'm assuming is not what you needed from me, but its  there just  in
case).

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[Altguard]

https://bugs.kde.org/show_bug.cgi?id=388182

--- Comment #2 from Altguard  ---
Created attachment 109506
  --> https://bugs.kde.org/attachment.cgi?id=109506=edit
gdb output

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[kwin] [Bug 388182] Plasma breaks when taking a screenshot of chromium

[David Edmundson]

https://bugs.kde.org/show_bug.cgi?id=388182

David Edmundson  changed:

   What|Removed |Added

   Target Milestone|1.0 |---
Product|plasmashell |kwin
  Component|general |general
Version|master  |unspecified
   Assignee|k...@davidedmundson.co.uk|kwin-bugs-n...@kde.org

--- Comment #1 from David Edmundson  ---
>From your video kwin's locked (but not dead, which is why you can't --replace
it)

Can you run the following:

switch to a TTY (or ssh in from another computer)
run "sudo gdb --pid `pidof kwin_x11`"

when that loads type

set logging on
set pagination off
bt


then quit

you should then find a file called gdb.txt in that directory.

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