* [Bug 105339] Deadlock inside glClientWaitSync
2018-03-04 23:55 [Bug 105339] Deadlock inside glClientWaitSync bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
--- Comment #1 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
Created attachment 137783
--> https://bugs.freedesktop.org/attachment.cgi?id=137783&action=edit
Binary test built with Debug & full symbols
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^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug 105339] Deadlock inside glClientWaitSync
2018-03-04 23:55 [Bug 105339] Deadlock inside glClientWaitSync bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
--- Comment #2 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
Created attachment 137784
--> https://bugs.freedesktop.org/attachment.cgi?id=137784&action=edit
Relevant Source Code
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^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug 105339] Deadlock inside glClientWaitSync
2018-03-04 23:55 [Bug 105339] Deadlock inside glClientWaitSync bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
--- Comment #3 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
I've uploaded a binary with the repro.
Unfortunately it wasn't easy to repro the problem on a simpler one-liner test
case.
Just download the binary and run Sample_PlanarReflections-2.2.0
Let me know if you have issues executing the file (e.g. a hardcoded path
slipped through, missing library)
Just move around the scene (WASD + mouse). It should hang within the first
minute. It often hangs in the first 10 seconds, but it can take up to 2
minutes, at least on my machine.
As for the code, it hangs inside GL3PlusRenderSystem::_endFrame in
RenderSystems/GL3Plus/src/OgreGL3PlusRenderSystem.cpp which purposedly runs a
lot of fences to trigger the deadlock.
I included the source code so the symbols work for you
If anyone wants to build it from source code, let me know and I will assist.
I'm using Ogre 2.2's f7302ccfa4a9fde3f0e47835924f37db1b3b06b8 build, but
OgreGL3PlusRenderSystem.cpp has been modified to trigger the bug more easily.
Please note that only this sample so far appears to trigger the race condition.
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^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug 105339] Deadlock inside glClientWaitSync
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
--- Comment #4 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
By the way, if I change the waits to the following:
while( waitRet != GL_ALREADY_SIGNALED && waitRet != GL_CONDITION_SATISFIED )
{
waitDuration = 1 second;
waitRet = glClientWaitSync( fenceName, waitFlags, waitDuration );
assert( waitRet != GL_WAIT_FAILED );
}
Then it still deadlocks. glClientWaitSync returns, but the fence never
completes, leaving the while() loop as an infinite loop.
Once it starts deadlock, if I step inside si_fence_finish I can see that
rfence->tc_token is 0, which either means that it was always 0, or it has been
already zeroed.
I do not know how to continue debugging this race condition as I am not
familiar with the code.
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^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug 105339] Deadlock inside glClientWaitSync
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
--- Comment #5 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
I traced the regression to commit:
commit bc65dcab3bc48673ff6180afb036561a4b8b1119
Author: Nicolai Hähnle <nicolai.haehnle@amd.com>
Date: Fri Nov 10 10:58:10 2017 +0100
radeonsi: avoid syncing the driver thread in si_fence_finish
It is really only required when we need to flush for deferred fences.
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Although I slightly suspect the former code was just making the race condition
much harder to trigger, considering I've played other Dolphin games in the past
(before this regression) and they ocasionally hanged in a similar way after 2-4
hours of continuous play or so (extremely rare to trigger) and it wouldn't
always happen (But that may have been a different bug).
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^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug 105339] Deadlock inside glClientWaitSync [Regresion bc65dcab3bc48673ff6180afb036561a4b8b1119]
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
Matias N. Goldberg <dark_sylinc@yahoo.com.ar> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Deadlock inside |Deadlock inside
|glClientWaitSync |glClientWaitSync [Regresion
| |bc65dcab3bc48673ff6180afb03
| |6561a4b8b1119]
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^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug 105339] Deadlock inside glClientWaitSync [Regresion bc65dcab3bc48673ff6180afb036561a4b8b1119]
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
--- Comment #6 from Ben Clapp <benclapp55@gmail.com> ---
With a TR 1950X CPU, RX 580 GPU, Debian testing branch (buster), Mesa 18.0, I'm
also able to reproduce this bug. (I also discovered it using Dolphin.)
The issue wasn't present in 17.3.7, but when I made the jump to 18.0 it began
occurring.
The exact timing of the freeze is a bit inconsistent, but I can get it to
happen fairly quickly and consistently.
It seems to be strictly an application freeze, as opposed to a GPU hang, you
can kill dolphin-emu and continue using your system without issue/reboot.
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
Gregor Münch <gr.muench@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nhaehnle@gmail.com
--- Comment #7 from Gregor Münch <gr.muench@gmail.com> ---
added author of regression
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^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug 105339] Deadlock inside glClientWaitSync [Regresion bc65dcab3bc48673ff6180afb036561a4b8b1119]
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https://bugs.freedesktop.org/show_bug.cgi?id=105339
Marek Olšák <maraeo@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #8 from Marek Olšák <maraeo@gmail.com> ---
I think this one is fixed by:
commit 7083ac7290a0c37a45494437a45441112f3cc36c
Author: Marek Olšák <marek.olsak@amd.com>
Date: Tue Apr 24 17:01:35 2018 -0400
util/u_queue: fix a deadlock in util_queue_finish
Cc: 18.0 18.1 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Feel free to reopen if you encounter the issue again.
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