[llvm-dev] [Mesa-dev] issues with split llvm libraries and llvmpipe and failing to load library
Nicolai Hähnle via llvm-dev
llvm-dev at lists.llvm.org
Thu Feb 11 07:05:45 PST 2016
On 10.02.2016 22:59, Dave Airlie wrote:
> Hey,
>
> So in Fedora rawhide we are now building llvm 3.7.1 into the lots of
> little shared libraries format.
Barring all the other problems, are you sure this is a good idea? I
remember somebody mentioning that at least LLVM's own test suite runs
much slower in this build configuration. I don't know whether this is
"only" due to a slower startup time in the dynamic linker or also due to
slower compile times at runtime, but it's probably worth measuring.
Another thing to keep in mind is that of the many buildbots LLVM has,
apparently _none of them_ run in the lots of little shared libraries
format (as I discovered a few months ago thanks to a regression there).
Unless you can convince the LLVM folks to change that, you (Fedora) will
likely end up in the fun situation of becoming the de facto maintainer
of that format.
Sorry I can't be of more help with the actual issues you're having.
Nicolai
> However I'm running into a major problem with the fact that sometimes
> dlclose isn't dropping all the LLVM libraries from the address space
> of the process.
>
> We have a sequence like this:
>
> a) X server asks mesa gbm library to init, it loads the
> kms_swrast_dri.so with dlopen(LAZY|GLOBAL). kms_swrast_dri.so is
> linked against a large bunch of LLVM libraries (see below).
>
> b) gbm discovers it can't do what it wants and dlcloses the library.
> At this point a bunch of the LLVM libraries drop out of the map,
> pretty much everything down to LLVMTarget. Everything from
> LLVMTarget onwards remains loaded and I've no idea how to discover why.
>
> c) later X tries to load kms_swrast_dri.so for GLX usage, and it
> brings back in all the LLVM libraries that got dropped out, however as
> LLVMObject has never been cleaned up, it has all the command line
> options in it, so we get
> : CommandLine Error: Option 'x86-asm-syntax' registered more than once!
> LLVM ERROR: inconsistency in registered CommandLine options
> and things crash.
>
> So anyone any ideas why we the linker isn't dropping all the other
> LLVM libraries, or any workaround for this, apart from just going back
> to the single libLLVM?
>
> Dave.
>
> [airlied at f21vm ~]$ ldd /usr/lib64/dri/kms_swrast_dri.so
> linux-vdso.so.1 (0x00007ffec17fe000)
> libcrypto.so.10 => /lib64/libcrypto.so.10 (0x00007f8a68ac5000)
> libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f8a688a3000)
> libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f8a68685000)
> libdl.so.2 => /lib64/libdl.so.2 (0x00007f8a68481000)
> libexpat.so.1 => /lib64/libexpat.so.1 (0x00007f8a68255000)
> libdrm_intel.so.1 => /lib64/libdrm_intel.so.1 (0x00007f8a68033000)
> libdrm_nouveau.so.2 => /lib64/libdrm_nouveau.so.2 (0x00007f8a67e2b000)
> libdrm_radeon.so.1 => /lib64/libdrm_radeon.so.1 (0x00007f8a67c1f000)
> libdrm_amdgpu.so.1 => /lib64/libdrm_amdgpu.so.1 (0x00007f8a67a16000)
> libdrm.so.2 => /lib64/libdrm.so.2 (0x00007f8a67807000)
> libelf.so.1 => /lib64/libelf.so.1 (0x00007f8a675ef000)
> libLLVMAMDGPUCodeGen.so.3.7 => /lib64/libLLVMAMDGPUCodeGen.so.3.7
> (0x00007f8a672e2000)
> libLLVMAMDGPUAsmParser.so.3.7 =>
> /lib64/libLLVMAMDGPUAsmParser.so.3.7 (0x00007f8a670a1000)
> libLLVMAMDGPUUtils.so.3.7 => /lib64/libLLVMAMDGPUUtils.so.3.7
> (0x00007f8a66e9f000)
> libLLVMAMDGPUDesc.so.3.7 => /lib64/libLLVMAMDGPUDesc.so.3.7
> (0x00007f8a66b9b000)
> libLLVMAMDGPUInfo.so.3.7 => /lib64/libLLVMAMDGPUInfo.so.3.7
> (0x00007f8a66999000)
> libLLVMAMDGPUAsmPrinter.so.3.7 =>
> /lib64/libLLVMAMDGPUAsmPrinter.so.3.7 (0x00007f8a66774000)
> libLLVMObjCARCOpts.so.3.7 => /lib64/libLLVMObjCARCOpts.so.3.7
> (0x00007f8a6654e000)
> libLLVMOption.so.3.7 => /lib64/libLLVMOption.so.3.7 (0x00007f8a66340000)
> libLLVMIRReader.so.3.7 => /lib64/libLLVMIRReader.so.3.7 (0x00007f8a6613b000)
> libLLVMAsmParser.so.3.7 => /lib64/libLLVMAsmParser.so.3.7
> (0x00007f8a65ef2000)
> libLLVMLinker.so.3.7 => /lib64/libLLVMLinker.so.3.7 (0x00007f8a65cdc000)
> libLLVMipo.so.3.7 => /lib64/libLLVMipo.so.3.7 (0x00007f8a65a4a000)
> libLLVMVectorize.so.3.7 => /lib64/libLLVMVectorize.so.3.7
> (0x00007f8a657ef000)
> libLLVMAArch64Disassembler.so.3.7 =>
> /lib64/libLLVMAArch64Disassembler.so.3.7 (0x00007f8a655d0000)
> libLLVMAArch64CodeGen.so.3.7 =>
> /lib64/libLLVMAArch64CodeGen.so.3.7 (0x00007f8a652b0000)
> libLLVMAArch64AsmParser.so.3.7 =>
> /lib64/libLLVMAArch64AsmParser.so.3.7 (0x00007f8a65058000)
> libLLVMAArch64Desc.so.3.7 => /lib64/libLLVMAArch64Desc.so.3.7
> (0x00007f8a64dde000)
> libLLVMAArch64Info.so.3.7 => /lib64/libLLVMAArch64Info.so.3.7
> (0x00007f8a64bdc000)
> libLLVMAArch64AsmPrinter.so.3.7 =>
> /lib64/libLLVMAArch64AsmPrinter.so.3.7 (0x00007f8a64979000)
> libLLVMAArch64Utils.so.3.7 => /lib64/libLLVMAArch64Utils.so.3.7
> (0x00007f8a64768000)
> libLLVMBitWriter.so.3.7 => /lib64/libLLVMBitWriter.so.3.7
> (0x00007f8a64541000)
> libLLVMX86Disassembler.so.3.7 =>
> /lib64/libLLVMX86Disassembler.so.3.7 (0x00007f8a641df000)
> libLLVMX86AsmParser.so.3.7 => /lib64/libLLVMX86AsmParser.so.3.7
> (0x00007f8a63f4b000)
> libLLVMX86CodeGen.so.3.7 => /lib64/libLLVMX86CodeGen.so.3.7
> (0x00007f8a63b61000)
> libLLVMSelectionDAG.so.3.7 => /lib64/libLLVMSelectionDAG.so.3.7
> (0x00007f8a63761000)
> libLLVMAsmPrinter.so.3.7 => /lib64/libLLVMAsmPrinter.so.3.7
> (0x00007f8a634e6000)
> libLLVMCodeGen.so.3.7 => /lib64/libLLVMCodeGen.so.3.7 (0x00007f8a63014000)
> libLLVMScalarOpts.so.3.7 => /lib64/libLLVMScalarOpts.so.3.7
> (0x00007f8a62c92000)
> libLLVMProfileData.so.3.7 => /lib64/libLLVMProfileData.so.3.7
> (0x00007f8a62a67000)
> libLLVMInstCombine.so.3.7 => /lib64/libLLVMInstCombine.so.3.7
> (0x00007f8a627aa000)
> libLLVMInstrumentation.so.3.7 =>
> /lib64/libLLVMInstrumentation.so.3.7 (0x00007f8a6253f000)
> libLLVMTransformUtils.so.3.7 =>
> /lib64/libLLVMTransformUtils.so.3.7 (0x00007f8a6226b000)
> libLLVMipa.so.3.7 => /lib64/libLLVMipa.so.3.7 (0x00007f8a62043000)
> libLLVMX86Desc.so.3.7 => /lib64/libLLVMX86Desc.so.3.7 (0x00007f8a61c95000)
> libLLVMMCDisassembler.so.3.7 =>
> /lib64/libLLVMMCDisassembler.so.3.7 (0x00007f8a61a8f000)
> libLLVMX86Info.so.3.7 => /lib64/libLLVMX86Info.so.3.7 (0x00007f8a6188d000)
> libLLVMX86AsmPrinter.so.3.7 => /lib64/libLLVMX86AsmPrinter.so.3.7
> (0x00007f8a61647000)
> libLLVMX86Utils.so.3.7 => /lib64/libLLVMX86Utils.so.3.7 (0x00007f8a6143e000)
> libLLVMMCJIT.so.3.7 => /lib64/libLLVMMCJIT.so.3.7 (0x00007f8a61233000)
> libLLVMExecutionEngine.so.3.7 =>
> /lib64/libLLVMExecutionEngine.so.3.7 (0x00007f8a61011000)
> libLLVMTarget.so.3.7 => /lib64/libLLVMTarget.so.3.7 (0x00007f8a60e02000)
> libLLVMAnalysis.so.3.7 => /lib64/libLLVMAnalysis.so.3.7 (0x00007f8a60a33000)
> libLLVMRuntimeDyld.so.3.7 => /lib64/libLLVMRuntimeDyld.so.3.7
> (0x00007f8a607e4000)
> libLLVMObject.so.3.7 => /lib64/libLLVMObject.so.3.7 (0x00007f8a60574000)
> libLLVMMCParser.so.3.7 => /lib64/libLLVMMCParser.so.3.7 (0x00007f8a60347000)
> libLLVMBitReader.so.3.7 => /lib64/libLLVMBitReader.so.3.7
> (0x00007f8a60112000)
> libLLVMMC.so.3.7 => /lib64/libLLVMMC.so.3.7 (0x00007f8a5fe91000)
> libLLVMCore.so.3.7 => /lib64/libLLVMCore.so.3.7 (0x00007f8a5fa56000)
> libLLVMSupport.so.3.7 => /lib64/libLLVMSupport.so.3.7 (0x00007f8a5f66a000)
> libm.so.6 => /lib64/libm.so.6 (0x00007f8a5f360000)
> libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f8a5f149000)
> libc.so.6 => /lib64/libc.so.6 (0x00007f8a5ed72000)
> libz.so.1 => /lib64/libz.so.1 (0x00007f8a5eb5c000)
> libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f8a5e8e7000)
> /lib64/ld-linux-x86-64.so.2 (0x0000565263dae000)
> libpciaccess.so.0 => /lib64/libpciaccess.so.0 (0x00007f8a5e6dc000)
> librt.so.1 => /lib64/../lib64/librt.so.1 (0x00007f8a5e4d2000)
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