[Bug 66331] WebGL water demo crashes LLVM

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=66331

--- Comment #2 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
(In reply to comment #1)
> With current Mesa CVS (10.0.0! ;-) on RV730 AGP I get this,too.
> 
> Pure LLVM (3.3 stable) bug, NOT sb.
> 
> setenv R600_DEBUG nollvm
> Works OK.
> 
> Nice link, Grigori!
> 
> Application: konqueror (4.11.2)
> KDE Platform Version: 4.11.2
> Qt Version: 4.8.5
> Operating System: Linux 3.12.0-rc3-1-desktop i686
> Distribution: "openSUSE 12.3 (i586)"

Hopefully better (with LLVM source) trace run:

Program received signal SIGSEGV, Segmentation fault.
llvm::ScheduleDAGInstrs::addVRegUseDeps (this=0x0, SU=0xffffffff,
OperIdx=<optimized out>)
    at /usr/src/debug/llvm-3.3/lib/CodeGen/ScheduleDAGInstrs.cpp:414
414       LiveRangeQuery LRQ(LIS->getInterval(Reg),
LIS->getInstructionIndex(MI));
(gdb) list
409       MachineInstr *MI = SU->getInstr();                                    
410       unsigned Reg = MI->getOperand(OperIdx).getReg();                      
411                                                                             
412       // Lookup this operand's reaching definition.                         
413       assert(LIS && "vreg dependencies requires LiveIntervals");            
414       LiveRangeQuery LRQ(LIS->getInterval(Reg),
LIS->getInstructionIndex(MI));                  
415       VNInfo *VNI = LRQ.valueIn();                                          
416                                                                             
417       // VNI will be valid because MachineOperand::readsReg() is checked by
caller.             
418       assert(VNI && "No value to read by operand");                         
(gdb) info registers 
eax            0xad55d20        181755168                                       
ecx            0x0      0                                                       
edx            0x0      0                                                       
ebx            0xad33d000       -1389113344                                     
esp            0xbfff6f40       0xbfff6f40                                      
ebp            0x0      0x0                                                     
esi            0xad441f8        181682680                                       
edi            0xad55d20        181755168                                       
eip            0xad2e747d                                                       
    0xad2e747d <llvm::ScheduleDAGInstrs::addVRegUseDeps(llvm::SUnit*, unsigned
int)+77>             
eflags         0x210246 [ PF ZF IF RF ID ]                                      
cs             0x73     115                                                     
ss             0x7b     123                                                     
ds             0x7b     123                                                     
es             0x7b     123                                                     
fs             0x0      0                                                       
gs             0x33     51                                                      
(gdb) bt                                                                        
#0  llvm::ScheduleDAGInstrs::addVRegUseDeps (this=0x0, SU=0xffffffff,
OperIdx=<optimized out>)      
    at /usr/src/debug/llvm-3.3/lib/CodeGen/ScheduleDAGInstrs.cpp:414            
#1  0xad2e9890 in llvm::ScheduleDAGInstrs::buildSchedGraph (this=0xad55d20,
AA=<optimized out>,     
    RPTracker=0x700) at
/usr/src/debug/llvm-3.3/lib/CodeGen/ScheduleDAGInstrs.cpp:776               
#2  0xad21a4dc in llvm::DefaultVLIWScheduler::schedule (this=0xad55d20)         
    at /usr/src/debug/llvm-3.3/lib/CodeGen/DFAPacketizer.cpp:124                
#3  0xad21a7c9 in llvm::VLIWPacketizerList::PacketizeMIs (this=0xbfff7368,
MBB=<optimized out>,     
    BeginItr=..., EndItr=...) at
/usr/src/debug/llvm-3.3/lib/CodeGen/DFAPacketizer.cpp:164          
#4  0xad90f426 in llvm::R600Packetizer::runOnMachineFunction (this=<optimized
out>, Fn=...)         
    at /usr/src/debug/llvm-3.3/lib/Target/R600/R600Packetizer.cpp:444           
#5  0xad27cbb5 in llvm::MachineFunctionPass::runOnFunction (this=0xac81dd0,
F=...)
    at /usr/src/debug/llvm-3.3/lib/CodeGen/MachineFunctionPass.cpp:33
#6  0xacdb7307 in llvm::FPPassManager::runOnFunction (this=0x36, F=...)
    at /usr/src/debug/llvm-3.3/lib/IR/PassManager.cpp:1530
#7  0xacdb7530 in llvm::FPPassManager::runOnModule (this=0xaba13d8, M=...)
    at /usr/src/debug/llvm-3.3/lib/IR/PassManager.cpp:1550
#8  0xacdb77d9 in llvm::MPPassManager::runOnModule (this=0xac6db08, M=...)
    at /usr/src/debug/llvm-3.3/lib/IR/PassManager.cpp:1608
#9  0xacdb7fa1 in llvm::PassManagerImpl::run (this=0xac6a1e0, M=...)
    at /usr/src/debug/llvm-3.3/lib/IR/PassManager.cpp:1703
#10 0xacdb8157 in llvm::PassManager::run (this=0xbfff7578, M=...)
    at /usr/src/debug/llvm-3.3/lib/IR/PassManager.cpp:1738
#11 0xacea2651 in LLVMTargetMachineEmit (T=<optimized out>, M=0xaaed0c0,
OS=..., 
    codegen=<optimized out>, ErrorMessage=<optimized out>)
    at /usr/src/debug/llvm-3.3/lib/Target/TargetMachineC.cpp:194
#12 0xacea27a3 in LLVMTargetMachineEmitToMemoryBuffer (T=0xac68280,
M=0xaaed0c0, codegen=
    LLVMObjectFile, ErrorMessage=0xbfff7640, OutMemBuf=<optimized out>)
    at /usr/src/debug/llvm-3.3/lib/Target/TargetMachineC.cpp:220
#13 0xade1c7d6 in radeon_llvm_compile () from /usr/lib/dri/updates/r600_dri.so
---Type <return> to continue, or q <return> to quit---
#14 0xade173e2 in r600_llvm_compile () from /usr/lib/dri/updates/r600_dri.so
#15 0xaddc80f7 in r600_shader_from_tgsi () from
/usr/lib/dri/updates/r600_dri.so
#16 0xaddc9335 in r600_pipe_shader_create () from
/usr/lib/dri/updates/r600_dri.so
#17 0xadddadfd in r600_shader_select () from /usr/lib/dri/updates/r600_dri.so
#18 0xadddafb4 in r600_create_shader_state () from
/usr/lib/dri/updates/r600_dri.so
#19 0xadbd4413 in st_translate_fragment_program () from
/usr/lib/dri/updates/r600_dri.so
#20 0xadbd4fd6 in st_get_fp_variant () from /usr/lib/dri/updates/r600_dri.so
#21 0xadb9ccfc in update_fp () from /usr/lib/dri/updates/r600_dri.so
#22 0xadb9997e in st_validate_state () from /usr/lib/dri/updates/r600_dri.so
#23 0xadbaea9c in st_draw_vbo () from /usr/lib/dri/updates/r600_dri.so
#24 0xadb82745 in vbo_handle_primitive_restart () from
/usr/lib/dri/updates/r600_dri.so
#25 0xadb84247 in vbo_validated_drawrangeelements () from
/usr/lib/dri/updates/r600_dri.so
#26 0xadb8462c in vbo_exec_DrawElements () from
/usr/lib/dri/updates/r600_dri.so
#27 0xb2775b9f in ?? () from /usr/lib/libQtWebKit.so.4
#28 0xb27661f5 in ?? () from /usr/lib/libQtWebKit.so.4
#29 0xb292f430 in ?? () from /usr/lib/libQtWebKit.so.4
#30 0xb2e1d92b in ?? () from /usr/lib/libQtWebKit.so.4
#31 0xb2e03109 in ?? () from /usr/lib/libQtWebKit.so.4
#32 0xfffffffb in ?? ()
#33 0xb2ea305e in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType,
JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) () from
/usr/lib/libQtWebKit.so.4
#34 0xb0b5ea4c in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

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