Segmentation fault when cloning a sparse matrix #28913
Description
The program below results in a segmentation fault for me when run on Julia 0.7.0 on Mac.
using SparseArrays
function go()
A = sprandn(10, 10, 0.1)
v = Vector(undef, 2)
for i = 1:2
v[i] = SparseMatrixCSC(A.m, A.n, A.colptr, A.rowval, copy(A.nzval))
end
end
@time go()
Results in:
signal (11): Segmentation fault: 11
in expression starting at no file:0
_ZN4llvm9LiveRange4joinERS0_PKiS3_RNS_15SmallVectorImplIPNS_6VNInfoEEE at /Applications/Julia-0.7.app/Contents/Resources/julia/lib/julia/libLLVM.dylib (unknown line)
_ZN12_GLOBAL__N_117RegisterCoalescer8joinCopyEPN4llvm12MachineInstrERb at /Applications/Julia-0.7.app/Contents/Resources/julia/lib/julia/libLLVM.dylib (unknown line)
_ZN12_GLOBAL__N_117RegisterCoalescer20copyCoalesceWorkListEN4llvm15MutableArrayRefIPNS1_12MachineInstrEEE at /Applications/Julia-0.7.app/Contents/Resources/julia/lib/julia/libLLVM.dylib (unknown line)
_ZN12_GLOBAL__N_117RegisterCoalescer20runOnMachineFunctionERN4llvm15MachineFunctionE at /Applications/Julia-0.7.app/Contents/Resources/julia/lib/julia/libLLVM.dylib (unknown line)
_ZN4llvm19MachineFunctionPass13runOnFunctionERNS_8FunctionE at /Applications/Julia-0.7.app/Contents/Resources/julia/lib/julia/libLLVM.dylib (unknown line)
_ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE at /Applications/Julia-0.7.app/Contents/Resources/julia/lib/julia/libLLVM.dylib (unknown line)
_ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE at /Applications/Julia-0.7.app/Contents/Resources/julia/lib/julia/libLLVM.dylib (unknown line)
_ZN4llvm6legacy15PassManagerImpl3runERNS_6ModuleE at /Applications/Julia-0.7.app/Contents/Resources/julia/lib/julia/libLLVM.dylib (unknown line)
If I replace the for loop with v[1] = ... and v[2] = ..., the program works. Also, if I use copy(A.colptr) it works. It also works in Julia 0.6.4.
What I’m trying to achieve is to create a few new matrices with the same sparsity pattern as an existing matrix, but with modified values, and in order to improve performance I want to reuse the colptr and rowval vectors.
Output of versioninfo():
Julia Version 0.7.0
Commit a4cb80f3ed (2018-08-08 06:46 UTC)
Platform Info:
OS: macOS (x86_64-apple-darwin14.5.0)
CPU: Intel(R) Core(TM) i7-6920HQ CPU @ 2.90GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-6.0.0 (ORCJIT, skylake)