JuliaLang/julia

LibGit2.set_ssl_cert_locations segfaults on a cluster

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#17,789 opened on Aug 3, 2016

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Description

I got the #15128 error on a cluster when running Pkg.init() and when trying to point set_ssl_cert_locations to the certificates I get segfaults.

julia> LibGit2.set_ssl_cert_locations("/etc/ssl/certs/Go_Daddy_Root_Certificate_Authority_G2.pem")
ERROR: ReadOnlyMemoryError()

julia> LibGit2.set_ssl_cert_locations("/etc/ssl/certs/Staat_der_Nederlanden_Root_CA.pem")

signal (11): Segmentation fault
while loading no file, in expression starting on line 0
unknown function (ip: 0x2ba68c5a7fff)
Allocations: 1671531 (Pool: 1670594; Big: 937); GC: 0
Segmentation fault

This is on

julia> versioninfo()
Julia Version 0.5.0-rc0+146
Commit 37e6397* (2016-08-03 00:47 UTC)
Platform Info:
  System: Linux (x86_64-suse-linux)
  CPU: Intel(R) Xeon(R) CPU E5-2695 v2 @ 2.40GHz
  WORD_SIZE: 64
  BLAS: libmkl_rt
  LAPACK: libmkl_rt
  LIBM: libimf
  LLVM: libLLVM-3.7.1 (ORCJIT, ivybridge)

Contributor guide

Research direction
Inspect the LibGit2 wrapper code in Julia's source, particularly the `set ssl cert locations` function in `base/libgit2.jl` and the corresponding C code in `deps/libgit2/`. Reproduce the segfault with a debug build to identify the memory access violation.
Tech stack
c
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
JuliaCdebugging
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20