[Bug 82977] New: freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

[Bug 82977] New: freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

          Priority: medium
            Bug ID: 82977
          Assignee: dri-devel@lists.freedesktop.org
           Summary: freeze when copying between larger OpenGL buffers
                    (glCopyBufferSubData)
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: osbios@web.de
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Created attachment 105127
  --> https://bugs.freedesktop.org/attachment.cgi?id=105127&action=edit
glxinfo

Ubuntu 14.04. With Oibaf repository for GPU drivers.
Radeon 7870 (Pitcairn)

When I try to run glCopyBufferSubData on large buffers (128MB works ok, 200MiB
not) my Desktop freezes and I only can move the mouse around.
The mouse curser image stays the same after that. E.g. a normal pointer or text
marker icon.

I have no relevant message in dmsg.0 or Xorg.1.log, as far as I can tell.


Minimal example code that will trigger the freeze (After using sdl2 to init
Core GL3.3 Context + Window):

int bufferSize = 200 * 1024 * 1024;
GLuint clientBufferId, serverBufferId;
glGenBuffers(1, &clientBufferId);
glBindBuffer(GL_ARRAY_BUFFER, clientBufferId);
glBufferStorage(GL_ARRAY_BUFFER, bufferSize, 0, /*GL_DYNAMIC_STORAGE_BIT |
GL_MAP_WRITE_BIT | GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT|
GL_CLIENT_STORAGE_BIT*/0);

glGenBuffers(1, &serverBufferId);
glBindBuffer(GL_ARRAY_BUFFER, serverBufferId);
glBufferStorage(GL_ARRAY_BUFFER, bufferSize, 0, 0);

glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_COPY_READ_BUFFER,  clientBufferId);
glBindBuffer(GL_COPY_WRITE_BUFFER, serverBufferId);
glCopyBufferSubData(GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, 0, 0,
bufferSize);

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Can you flesh out the minimal reproducer so we can just compile and run it?

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #2 from Osbios <osbios@web.de> ---
Created attachment 105143
  --> https://bugs.freedesktop.org/attachment.cgi?id=105143&action=edit
minimal example only needs sdl2 to compile

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #3 from Osbios <osbios@web.de> ---
Created attachment 105144
  --> https://bugs.freedesktop.org/attachment.cgi?id=105144&action=edit
CMakeLists.txt

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 288 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #4 from Osbios <osbios@web.de> ---
Created attachment 105145
  --> https://bugs.freedesktop.org/attachment.cgi?id=105145&action=edit
FindSDL2.cmake

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #5 from Osbios <osbios@web.de> ---
Here is a minimal example, only needs sdl2. cmake files included.
Sometimes I hat to run the executable 2-3 times before it froze my system.

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #6 from Osbios <osbios@web.de> ---
I tryed to get a more exact size that triggers the freeze. And im down to
128MiB. (Still could be lower)
Because it often need several tries before it freezes I changed from repeating
my program in the console to just a simple loop around the C++ code
(generating, copy, deleting of the buffers)
Looping over 64 MiB sized buffers now gave me errors in the program console and
in dmesg.

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #7 from Osbios <osbios@web.de> ---
Created attachment 105177
  --> https://bugs.freedesktop.org/attachment.cgi?id=105177&action=edit
dmesg

Ignore the ext4 errors please ;]

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 288 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #8 from Osbios <osbios@web.de> ---
Created attachment 105178
  --> https://bugs.freedesktop.org/attachment.cgi?id=105178&action=edit
console output

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 403 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #9 from Osbios <osbios@web.de> ---
Created attachment 105179
  --> https://bugs.freedesktop.org/attachment.cgi?id=105179&action=edit
main.cpp with looping (generating, copy, deleting) buffers

This triggers the error messages in the application console and dmesg

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #10 from Osbios <osbios@web.de> ---
ok forget the errors I get except the freezing.
The driver was just ranning our of memory because I hat no glFinish and gave it
no time for the actually copy/deleting of the buffers befor creating new ones.

There is no exact buffer size that causes the freeze.
If I try often enough I managed to kill it with a 123032 KiB buffer so far.

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
You're saying you can still get the freeze even with glFinish() in the loop?
And it never recovers from that?

Can you still switch to a console with Ctrl-Alt-Fx after the freeze, or log in
via SSH? If so, can you attach the dmesg output from at least 10 seconds after
the freeze?

Does this still happen with a newer kernel?

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #12 from Osbios <osbios@web.de> ---
Trying to copy 200 MiB, only the screen frezes. SSH works fine.
I can just kill -9 the program and everything is ok again. After that I have
this line in dmesg

[ 1851.802876] radeon 0000:01:00.0: failed to get a new IB (-512)

When I try to switch to console while my program still runs it appears to do
notihing, but after I kill -9 the program via ssh, I'm in the console.
I also tryed to move a windows around during the freeze, but that didn't work. 
Sometimes the mouse pointer freezes, too.

Also the size of the buffer does not matter, relevant is how much bytes get
copyed by glCopyBufferSubData.
And the bigger the copy is the more likely the freeze seems to be.

With a 256 MiB copy I managed to get a kernel bug message in dmesg and could
not recover by killing the program.

Will bake me some fresh kernels now.

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #13 from Osbios <osbios@web.de> ---
Created attachment 105283
  --> https://bugs.freedesktop.org/attachment.cgi?id=105283&action=edit
dmesg when trying to copy 256 MiB

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

--- Comment #14 from Christian König <deathsimple@vodafone.de> ---
(In reply to comment #13)
> Created attachment 105283 [details]
> dmesg when trying to copy 256 MiB

That's a known issue with older kernels, please update your kernel and make
sure it has "drm/radeon: update IB size estimation for VM".

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

Osbios <osbios@web.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

--- Comment #15 from Osbios <osbios@web.de> ---
Yes, it works with 3.17.0-rc2.

For anyone else, here is a link to the Kernel Bug Tracker:
https://bugzilla.kernel.org/show_bug.cgi?id=71081

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[Bug 82977] freeze when copying between larger OpenGL buffers (glCopyBufferSubData)

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https://bugs.freedesktop.org/show_bug.cgi?id=82977

Christian König <deathsimple@vodafone.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #16 from Christian König <deathsimple@vodafone.de> ---
Thanks, please open up a new bug report if you have further issues.

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