[Mesa-dev] [PIGLIT,radeonsi] crash in spec/glsl-1.50/execution/geometry/max-input-components – who's bug is it?

[Kai Wasserbäch]

Michel Dänzer schrieb am 15.04.2014 09:27:
> On 23.03.2014 04:53, Kai Wasserbäch wrote:
>> Dear Mesa devs,
>> I'm not sure whether this is a bug in Mesa, LLVM or in eglibc. The crash happens
>> in _int_malloc, but since that is certainly one of the more often used
>> functions, I'm not yet convinced, the fault lies indeed with eglibc.
>>
>> Therefore I'm attaching the full backtrace of the crash in
>> spec/glsl-1.50/execution/geometry/max-input-components (it takes a very long
>> time until the crash actually happens, Piglit recorded an execution time of
>> 1538.0506579875946) and hope you can point me to the right bug tracker.
>>
>> I'm unable to tell, whether this is a regression or not, since today was the
>> first time I was able to run a full Piglit quick test, without crashing my X on
>> this machine with the radeonsi.
> 
> It's not a regression. If you build LLVM with assertions enabled, you get:
> 
> shader_runner:
> /home/daenzer/src/llvm-git/llvm/lib/CodeGen/RegAllocGreedy.cpp:2268:
> unsigned int
> {anonymous}::RAGreedy::selectOrSplitImpl(llvm::LiveInterval&,
> llvm::SmallVectorImpl<unsigned int>&,
> {anonymous}::RAGreedy::SmallVirtRegSet&, unsigned int): Assertion
> `NewVRegs.empty() && "Cannot append to existing NewVRegs"' failed.
> 
> So this is an LLVM issue. It might be worth testing if Tom's register
> spilling patches help.

Can you point me to those patches? Preferrably as a branch, but ML is ok as well.

Thanks,
Kai

P.S.: Sorry for not coming back with a Valgrind log, but after waiting for
almost twelve hours I killed the job and didn't have time to start a new one.



-- 

Kai Wasserbäch (Kai Wasserbaech)

E-Mail: kai at dev.carbon-project.org

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