MbedTLS_jll seems broken on win64

[vtjnash]

observed at https://travis-ci.com/github/JuliaCI/Coverage.jl/jobs/434224582 (maybe a [compat] bounds issue?)

[visr]

Indeed it's broken, so many packages don't work on julia master right now.

Using the latest (v2.24.0+1) version of MbedTLS_jll gives the same as the CI log above:

julia> using MbedTLS_jll
ERROR: InitError: could not load library "C:\Users\visser_mn\.julia\artifacts\766d976def66e8367dd690d05cfe422f883d43ba\bin\libmbedtls.dll"

I had a look with DependencyWalker, here is a brief snippet of the output that may show the issue:

using DependencyWalker
Library(MbedTLS_jll.libmbedtls_path)
◼ C:\Users\visser_mn\.julia\artifacts\766d976def66e8367dd690d05cfe422f883d43ba\bin\libmbedtls.dll
 ◼ C:\bin\julia-1.6\bin\libmbedcrypto.dll
 ◼ C:\bin\julia-1.6\bin\libmbedx509.dll

Both the artifact and the julia bin dir have libmbedtls, libmbedcrypto, and libmbedx509. But now they are getting mixed. If I copy the 3 versions in the julia bin dir over the artifact versions, LibMbedTLS_jll loads without issue, and MbedTLS tests pass.

Maybe @staticfloat knowns if this will be resolved by #35193 (or already #38347?). Or can these two builds be made to work together?

[staticfloat]

#38347 will cause Pkg to not download new versions of MbedTLS_jll and instead use the copy that ships with Julia. That's the best solution to this.

[musm]

#38347 will cause Pkg to not download new versions of MbedTLS_jll and instead use the copy that ships with Julia. That's the best solution to this.

How does that work if MbedTLS_jll gets upgraded? Will users have to wait for a new release version of Julia to get the updated version of MbedTLS_jll?

[staticfloat]

Yes; because libmbedtls.so ships with Julia, it has always been the case that if you try to dlopen("libmbedtls.so") you'll get the one that Julia shipped with, even if MbedTLS_jll installed a different artifact. (This is only partially true; because on some systems libmbedtls.so is loaded lazily, your results would actually vary depending on whether you loaded Pkg or MbedTLS_jll first. Yikes!)

v1.6 will cut down on the confusion by just not downloading an artifact for MbedTLS_jll.

[timholy]

Yes, this is causing widespread test failures. @vtjnash, it looks like #38347 is just waiting on a review and could perhaps be merged soon?

[stillyslalom]

I think this is fixed on latest nightly:

julia> versioninfo()
Julia Version 1.6.0-DEV.1650
Commit 7d5c0c5633* (2020-12-03 22:42 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: AMD Ryzen 9 4900HS with Radeon Graphics
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.0 (ORCJIT, znver2)
Environment:
  JULIA_NUM_THREADS = 8

julia> using MbedTLS_jll
[ Info: Precompiling MbedTLS_jll [c8ffd9c3-330d-5841-b78e-0817d7145fa1]