[Mesa-dev] issues with split llvm libraries and llvmpipe and failing to load library

Dave Airlie airlied at gmail.com
Thu Feb 11 03:59:25 UTC 2016 

Hey,

So in Fedora rawhide we are now building llvm 3.7.1 into the lots of
little shared libraries format.

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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