https://bugs.freedesktop.org/show_bug.cgi?id=105869
Bug ID: 105869
Summary: clang crashes when compiling OpenCL kernel
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel@lists.freedesktop.org
Reporter: ved...@miletic.net
QA Contact: dri-devel@lists.freedesktop.org
(from #radeon and https://paste.debian.net/1018363/)
When compiling the following OpenCL kernel
kernel void PulseWave(global float* buffer, size_t num_harmonics,
float duty_cycle)
{
size_t index = get_global_id(0);
float phase = buffer[index];
float sample = duty_cycle;
float precompute1 = (phase - duty_cycle / 2.0) * 2.0 * M_PI;
for (size_t i = 1; i <= num_harmonics; ++i)
{
float harmonic = 2.0 / (i * M_PI) * sin(M_PI * i * duty_cycle)
*
cos(i * precompute1);
sample += harmonic;
}
buffer[index] = sample * 2.0 - 1.0;
}
Clang will crash with
Thread 1 "ftz_chiptune_pu" received signal SIGSEGV, Segmentation fault.
0x00007fffe6501ba1 in llvm::LiveRange::find(llvm::SlotIndex) () from
/usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
(gdb) bt
#0 0x00007fffe6501ba1 in llvm::LiveRange::find(llvm::SlotIndex) () from
/usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#1 0x00007fffe66674a1 in ?? () from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#2 0x00007fffe66676c1 in ?? () from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#3 0x00007fffe66697e5 in llvm::RegPressureTracker::getLiveThroughAt(unsigned
int, llvm::SlotIndex) const () from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#4 0x00007fffe6669af1 in
llvm::RegPressureTracker::recede(llvm::RegisterOperands const&,
llvm::SmallVectorImpl<llvm::RegisterMaskPair>*) ()
from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#5 0x00007fffe66a0229 in
llvm::ScheduleDAGInstrs::buildSchedGraph(llvm::AAResults*,
llvm::RegPressureTracker*, llvm::PressureDiffs*, llvm::LiveIntervals*, bool) ()
from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#6 0x00007fffe65e7653 in llvm::ScheduleDAGMILive::buildDAGWithRegPressure() ()
from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#7 0x00007fffe65e76b9 in llvm::ScheduleDAGMILive::schedule() () from
/usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#8 0x00007fffe758e501 in llvm::GCNScheduleDAGMILive::schedule() () from
/usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#9 0x00007fffe758e26e in llvm::GCNScheduleDAGMILive::finalizeSchedule() ()
from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#10 0x00007fffe65e6fa7 in ?? () from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#11 0x00007fffe657cae0 in
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) () from
/usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#12 0x00007fffe63deac8 in llvm::FPPassManager::runOnFunction(llvm::Function&)
() from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#13 0x00007fffe6fb7b50 in ?? () from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#14 0x00007fffe63de3af in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
from /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1
#15 0x00007ffff42227ce in ?? () from
/usr/lib/x86_64-linux-gnu/libMesaOpenCL.so.1
#16 0x00007ffff4222ed0 in ?? () from
/usr/lib/x86_64-linux-gnu/libMesaOpenCL.so.1
#17 0x00007ffff421e6a7 in ?? () from
/usr/lib/x86_64-linux-gnu/libMesaOpenCL.so.1
#18 0x00007ffff420fea1 in ?? () from
/usr/lib/x86_64-linux-gnu/libMesaOpenCL.so.1
#19 0x00007ffff41efe02 in ?? () from
/usr/lib/x86_64-linux-gnu/libMesaOpenCL.so.1
#20 0x0000555555561129 in cl::Program::build (this=0x7fffffffde10, options=0x0,
notifyFptr=0x0, data=0x0) at /usr/include/CL/cl2.hpp:6321
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