Created attachment 126700 [details] stderr output with R600_DEBUG=vs,tcs,tes,gs,ps,cs 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 480] (rev c7) mesa git, linux drm-next-4.9-wip, llvm 4.0.0svn_r282018 So I'm trying to start janusvr -render vive with the steamvr-osvr steamvr plugin. Because osvr-rendermanager still doesn't do core profile, I start it with MESA_GL_VERSION_OVERRIDE=3.3COMPAT MESA_GLSL_VERSION_OVERRIDE=330 ./janusvr -render vive But llvm segfaults: Thread 12 "si_shader:1" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffc3568700 (LWP 28734)] 0x00007fffc59ee0c6 in llvm::SSAUpdaterImpl<llvm::SSAUpdater>::BuildBlockList(llvm::BasicBlock*, llvm::SmallVectorImpl<llvm::SSAUpdaterImpl<llvm::SSAUpdater>::BBInfo*>*) () from /usr/lib/libLLVM-4.0svn.so #0 0x00007fffc59ee0c6 in llvm::SSAUpdaterImpl<llvm::SSAUpdater>::BuildBlockList(llvm::BasicBlock*, llvm::SmallVectorImpl<llvm::SSAUpdaterImpl<llvm::SSAUpdater>::BBInfo*>*) () at /usr/lib/libLLVM-4.0svn.so #1 0x00007fffc59f2acf in llvm::SSAUpdater::GetValueAtEndOfBlockInternal(llvm::BasicBlock*) () at /usr/lib/libLLVM-4.0svn.so #2 0x00007fffc59f942a in llvm::SSAUpdater::RewriteUseAfterInsertions(llvm::Use&) () at /usr/lib/libLLVM-4.0svn.so #3 0x00007fffc5cb7551 in (anonymous namespace)::StructurizeCFG::runOnRegion(llvm::Region*, llvm::RGPassManager&) () at /usr/lib/libLLVM-4.0svn.so #4 0x00007fffc5f3571c in llvm::RGPassManager::runOnFunction(llvm::Function&) () at /usr/lib/libLLVM-4.0svn.so #5 0x00007fffc53c03a2 in llvm::FPPassManager::runOnFunction(llvm::Function&) () at /usr/lib/libLLVM-4.0svn.so #6 0x00007fffc53c0443 in llvm::FPPassManager::runOnModule(llvm::Module&) () at /usr/lib/libLLVM-4.0svn.so #7 0x00007fffc53c0a54 in llvm::legacy::PassManagerImpl::run(llvm::Module&) () at /usr/lib/libLLVM-4.0svn.so #8 0x00007fffc61a5d57 in LLVMTargetMachineEmit(LLVMOpaqueTargetMachine*, LLVMOpaqueModule*, llvm::raw_pwrite_stream&, LLVMCodeGenFileType, char**) () at /usr/lib/libLLVM-4.0svn.so #9 0x00007fffc61a6139 in LLVMTargetMachineEmitToMemoryBuffer () at /usr/lib/libLLVM-4.0svn.so #10 0x00007fffc889e7c3 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #11 0x00007fffc8814605 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #12 0x00007fffc88161d2 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #13 0x00007fffc8822f73 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #14 0x00007fffc868ec34 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #15 0x00007fffc868e9f6 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #16 0x00007ffff2636454 in start_thread () at /usr/lib/libpthread.so.0 #17 0x00007ffff1ad67df in clone () at /usr/lib/libc.so.6
Created attachment 126706 [details] gdb.txt assertion with full backtrace With full debugging llvm and mesa I get an assertion instead: janusvr: /home/chris/build/llvm-svn/src/llvm/include/llvm/Analysis/LoopInfoImpl.h:247: void llvm::LoopBase<N, M>::verifyLoop() const [with BlockT = llvm::BasicBlock; LoopT = llvm::Loop]: Assertion `std::any_of(GraphTraits<BlockT*>::child_begin(BB), GraphTraits<BlockT*>::child_end(BB), [&](BlockT *B){return contains(B);}) && "Loop block has no in-loop successors!"' failed. backtrace full attached
I can reproduce this running plain JanusVR, and I'm going to investigate. Looks like there are actually two bugs - the one you originally reported, and another that prevents proper dumping of the affected shader.
This should be fixed in Mesa master now (commit 6f87d7a14699277be6dd17e9e712841c4057c4df).
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