[Bug 105339] Deadlock inside glClientWaitSync

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105339

            Bug ID: 105339
           Summary: Deadlock inside glClientWaitSync
           Product: Mesa
           Version: git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: dark_sylinc at yahoo.com.ar
        QA Contact: dri-devel at lists.freedesktop.org

Calling glClientWaitSync under specific conditions will run into an
unrecoverable deadlock.

The only known workaround is to issue a glFlush before glClientWaitSync.

I originally discovered this problem in the Dolphin Emulator, see ticket
https://bugs.dolphin-emu.org/issues/10904
However I am now reporting it because I was able to reproduce this bug
independently.

Reported affected systems so far:
Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
16GB RAM (1 stick)
GPU: Radeon RX 560 Series (POLARIS11 / DRM 3.19.0 / 4.14.11, LLVM 6.0.0)
Mesa 18.1.0-devel (git-183ce5e629)
Xubuntu 17.10
Kernel 4.14.11

i3 4150 @ 3.50ghz
DDR3 12GB RAM
AMD R7 260X 2GB VRAM
Ubuntu 17.10
Kernel 4.15.4
Mesa 18.1.0-devel


I will try to upload a simple repro if I can in the next few hours.
I stumble on this issue because our Ogre 2.2 sample "Sample_PlanarReflections"
is affected by it.

My git version is stuck at 847d0a393d7f0f967f39302900d5330f32b804c8 due to an
unrelated regression reported at
https://bugs.freedesktop.org/show_bug.cgi?id=105218

However I know the bug is still present as of
1f5618e81c00199d3349b1ade797382635b2af85 (which is not latest)

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