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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - OpenCL hangs graphics on CAYMAN"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73418#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - OpenCL hangs graphics on CAYMAN"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73418">bug 73418</a>
from <span class="vcard"><a class="email" href="mailto:christophe.choquet2@free.fr" title="christophe.choquet2@free.fr">christophe.choquet2@free.fr</a>
</span></b>
<pre>- 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.</pre>
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