[Bug 73418] OpenCL hangs graphics on CAYMAN

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #3 from christophe.choquet2 at free.fr ---
- If I run the OpenCL hello_world without starting the X server, it is running
fine. No hangs even if I run it multiple times. X starts properly after.

- If I run hello_world within an X session, it hangs ever two tries.

- If I start X server and run it in console, black screen/hang when returning
to the X session

With ddd, I have tracked the issue down to the point it hangs:
(gdb) bt
#0  radeon_drm_ws_queue_cs (ws=0x60b2e0, cs=0x7ffff7f6a010) at
radeon_drm_winsys.c:555
#1  0x00007ffff293a7e8 in radeon_drm_cs_flush (rcs=0x7ffff7f6a010, flags=2,
cs_trace_id=0) at radeon_drm_cs.c:567
#2  0x00007ffff2950f6d in r600_context_flush (ctx=0x6251d0, flags=2) at
r600_hw_context.c:356
#3  0x00007ffff2951f3b in r600_flush (ctx=0x6251d0, flags=0) at r600_pipe.c:88
#4  0x00007ffff2952056 in r600_flush_gfx_ring (ctx=0x6251d0, flags=0) at
r600_pipe.c:120
#5  0x00007ffff2952034 in r600_flush_from_st (ctx=0x6251d0,
fence=0x7fffffffb390, flags=0) at r600_pipe.c:115
#6  0x00007ffff6c0718a in clover::command_queue::flush (this=0x642000) at
core/queue.cpp:48
#7  0x00007ffff6c182f2 in clover::hard_event::wait (this=0xaca350) at
core/event.cpp:124
#8  0x00007ffff6c60811 in clFinish (d_q=0x642008) at api/event.cpp:268
#9  0x000000000040136c in main (argc=1, argv=0x7fffffffdd58) at
hello_world.c:193

If I run line 563 pipe_semaphore_signal(&ws->cs_queued) the system hang.

The calling parameters are in a mesa dev list post.

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