Issue 1:
I noticed this problem on my machine. I think it may be a bug as another person was able to reproduce it on their machine.

The problem is that julia crashes when I use the dot function from LinearAlgebra.jl on arrays of complex numbers that are longer than 10^4. If the arrays of complex numbers have of length 10001 or more, it crashes. If the arrays are real dot works just fine. If the arrays are complex and are less than 10001 entries dot works fine.

Another interesting point is that when I run the code for the dot function (found in the repository for LinearAlgebra) and use that function it works as it should in this case. So, when I run

function dot end

function dot(x, y) # arbitrary iterables
ix = iterate(x)
iy = iterate(y)
if ix === nothing
if iy !== nothing
throw(DimensionMismatch("x and y are of different lengths!"))
end
return dot(zero(eltype(x)), zero(eltype(y)))
end
if iy === nothing
throw(DimensionMismatch("x and y are of different lengths!"))
end
(vx, xs) = ix
(vy, ys) = iy
s = dot(vx, vy)
while true
ix = iterate(x, xs)
iy = iterate(y, ys)
ix === nothing && break
iy === nothing && break
(vx, xs), (vy, ys) = ix, iy
s += dot(vx, vy)
end
if !(iy === nothing && ix === nothing)
throw(DimensionMismatch("x and y are of different lengths!"))
end
return s
end

dot(x::Number, y::Number) = conj(x) * y

function dot(x::AbstractArray, y::AbstractArray)
lx = length(x)
if lx != length(y)
throw(DimensionMismatch("first array has length $(lx) which does not match the length of the second, $(length(y))."))
end
if lx == 0
return dot(zero(eltype(x)), zero(eltype(y)))
end
s = zero(dot(first(x), first(y)))
for (Ix, Iy) in zip(eachindex(x), eachindex(y))
@inbounds s += dot(x[Ix], y[Iy])
end
s
end

foo(n) = randn(n) + im*randn(n)

dot(foo(10^7),foo(10^7))

It works fine but if I run:

using LinearAlgebra: dot

foo(n) = randn(n) + im*randn(n)

dot(foo(10001),foo(10001))

julia crashes.

The error message I get before julia dies is here:

Please submit a bug report with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception:
Please submit a bug repor
Please submit a bug report with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1d407280 -- at 0x1d407280 -- OLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1d407280 -- at 0x1d407280 -- at 0x1d407280 -- OLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1d407280 -- at 0x1d407280 -- OLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1d407280 -- at 0x1d407280 -- OLATION at 0x1d407280 -- at 0x1d407280 -- OLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1d407280 -- at 0x1d407280 -- OLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1d407280 --

Here are my configurations

julia> versioninfo()
Julia Version 1.5.2
Commit 539f3ce943 (2020-09-23 23:17 UTC)
Platform Info:
OS: Windows (x86_64-w64-mingw32)
CPU: Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-9.0.1 (ORCJIT, skylake)

I am happy to supply any other help information.

Thank you.

Issue 2:
To reproduce

x = zeros(ComplexF64, 10001)
x' * x

The error message is

Please submit a bug report with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1a3e7280 -- at 0x1a3e7280 -- OLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1a3e7280 -- OLATION with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x1a3e7280 -- unknown function (ip: 000000001A3E7280)
in expression starting at REPL[10]:1
in expression starting at REPL[10]:1
)
reproduce this fault, and any error messages that follow (in their entirety). Thanks.

julia> versioninfo()
Julia Version 1.5.0
Commit 96786e22cc (2020-08-01 23:44 UTC)
Platform Info:
OS: Windows (x86_64-w64-mingw32)
CPU: Intel(R) Core(TM) i5-8265U CPU @ 1.60GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-9.0.1 (ORCJIT, skylake)

Does not happen on julia 1.4.2.