Re: [Chromium-users] Crash with multitile-sort

[Paul M. <p.e...@ru...>]

Brian Paul wrote:

> Paul Melis wrote:
>
>> Brian Paul wrote:
>>
>>> Paul Melis wrote:
>>>
>>>> Brian Paul wrote:
>>>>
>>>>> Paul Melis wrote:
>>>>>
>>>>>> Paul Melis wrote:
>>>>>>
>>>>>>
>>>>>>> Hello,
>>>>>>> While attempting to create a multi-tilesort configuration based 
>>>>>>> on the multitilesort.conf file included with CR1.9 two things 
>>>>>>> happen:
>>>>>>> 1. I get a warning about the state tracker being re-initialized
>>>>>>> 2. One of the crservers crashes (backtrace from the coredump 
>>>>>>> shows it to be in crSPUCopyDispatchTable()).
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> Just a bit more info, the crash is happening in 
>>>>>> spu_loader/spucopy.c, crSPUCopyDispatchTable().
>>>>>> In the first for-loop, the assignment temp = 
>>>>>> dst->copy_of->copyList sets temp to 0x1, which is later used as 
>>>>>> temp->copy.
>>>>>>
>>>>>> #0  0x5557f040 in crSPUCopyDispatchTable (dst=0x80d62c0, 
>>>>>> src=0x817d8c8) at spucopy.c:630
>>>>>> 630                             if (temp->copy == dst)
>>>>>> (gdb) bt
>>>>>> #0  0x5557f040 in crSPUCopyDispatchTable (dst=0x80d62c0, 
>>>>>> src=0x817d8c8) at spucopy.c:630
>>>>>> #1  0x08087fc5 in crStateDiffAPI (api=0x817d8c8) at state_flush.c:33
>>>>>> #2  0x080515e0 in crServerInit (argc=1, argv=0xffffd494) at 
>>>>>> server_main.c:240
>>>>>> #3  0x08051655 in CRServerMain (argc=1, argv=0xffffd494) at 
>>>>>> server_main.c:254
>>>>>> #4  0x08051012 in main (argc=1, argv=0xffffd494) at main.c:22
>>>>>> (gdb) p temp
>>>>>> $1 = (struct _copy_list_node *) 0x1
>>>>>> (gdb) p dst->copy_of
>>>>>> $2 = (struct _spu_dispatch_table *) 0xffffa520
>>>>>> (gdb)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> The demo was crashing for me too, but in a different way. I've 
>>>>> checked in fixes to tilesortspu_get.c and state_bufferobject.c 
>>>>> that fixed things here.  Can you try the current CVS code?
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> I'm sorry to say it doesn't fix the crash I'm experiencing. The 
>>>> stack trace above is still valid. I've attached a reduced version 
>>>> of my original configuration script. This shows the crash for me 
>>>> when running with e.g. "python multitilesort_crash.conf glxgears", 
>>>> but other apps fail in the same way.
>>>>
>>>> I had some trouble figuring out how exactly to set up the tiling 
>>>> parameters for this setup, so I might be doing something unusual 
>>>> there.
>>>
>>>
>>>
>>>
>>> Hmmm, works for me.
>>>
>>> What's the setting of RELEASE and THREADSAFE in your options.mk file?
>>
>>
>>
>> Both are 0.
>> I (now) guess that threadsafe should be turned on in case multiple 
>> instances of the same SPU are run on the same system?
>
>
> No.  You only need threadsafety if your application makes OpenGL calls 
> from more than one thread.

Hello Brian,
I'm still experiencing this crash after having recently picked up 
looking at it again.
Do you have any clue where this could come from and what I should 
investigate to get any further?

Regards,
Paul



-- 
Paul Melis

VR Specialist,
Center for High-Performance Computing & Visualization,
University of Groningen,
The Netherlands

T: +31 50 363 9298
E: p.e...@ru...
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