Groups   60 of 99+      julia-users › parallel threads broken, replacing module 6 posts by 3 authors      lapeyre.... gmail.com    7 29 15   Parallel threads has stopped working for me. Any ideas ? Code using addprocs and  everywhere include has stopped working  is broken  on one machine. Code that used to work now causes a number of varying errors to be printed, crashes, runaway processes, etc. when it is loaded. Both a recent v0.4 and a 2 month old version that did run the code in the past cause the failure. The same code on a different machine continues to run normally. Maybe my user Julia environment has a problem ? Or maybe I upgraded a system library ?  If I use just 2 processes, the code will sometimes  both load and run correctly.  A minimal example  test-jl ------ using Distributions ------   julia -p 4    everywhere include  test-jl    WARNING: replacing module Distributions     4 times   signal  11 : Segmentation fault unknown function  ip: 0x7f235c7ffd98 -jl_module_import at  usr local julia-0.4a bin .. lib julia libjulia.so  unknown line   etc.  I am running unstable debian linux.  Thanks, John      lapeyre.... gmail.com    7 29 15  Other recipients: lapeyre.... gmail.com  I can file a bug report. But, I'm not entirely sure what to write.  Simpler case:    julia -p 4    everywhere using ZChop  simple modules   The following version is from a completely fresh build today. I don't get a crash immediately, but I do get WARNING: replacing module ZChop  4 times  Version 0.4.0-dev+6394  2015-07-29 21:58 UTC  Commit a2a218b   0 days old master   Five days ago, i did git pull and built from an older clone Version 0.4.0-dev+6202  2015-07-24 01:47 UTC  Commit 53a7f2e   5 days old master  This version prints the same warning and spews many errors including unknown function  ip: 0x7fe94d596ff7  ERROR  unhandled task failure : EOFError: read end of file  The following version will load ZChop with no problem, but when loading Distributions, it still prints many errors and fails.  It loads some other modules  i.e with  everywhere, as above , such as Roots with no apparent errors. Version 0.4.0-dev+3965  2015-03-22 12:24 UTC  Commit e1f0310   129 days old master   A fresh build today on another machine gives errors with  everywhere using Roots. It fails to load Distributions even with no parallel threads, but this appears to be unrelated.  On the same  other  machine, the following version loads and runs parallel code using the modules mentioned above, and more. Version 0.4.0-dev+4096  2015-03-31 08:05 UTC  Commit a3c0743   120 days old master   I see no error with 0.3.5-pre+121  2015-01-07 00:19 UTC       Seth    7 29 15  Other recipients: lapeyre.... gmail.com  For what it's worth, I'm seeing the same thing:  julia   everywhere using LightGraphs WARNING: replacing module LightGraphs WARNING: replacing module LightGraphs WARNING: replacing module LightGraphs WARNING: replacing module LightGraphs exception on 4: ...  Lots of error messages   backtraces removed  ... ERROR: ProcessExitedException    in wait at  usr local julia-latest lib julia sys.dylib  in sync_end at  usr local julia-latest lib julia sys.dylib  in anonymous at multi-jl:348      Seth    7 29 15  Other recipients: lapeyre.... gmail.com, catc... bromberger.com  Reference: https:  github.com JuliaLang julia issues 12381      lapeyre.... gmail.com    7 30 15  Other recipients: catc... bromberger.com  Thanks Seth.      Nils Gudat    8 25 15  Other recipients: catc... bromberger.com  Can I just briefly revive this thread, as I don't want to spam the issue on GitHub?  I just switched over from 0.3.11, and I'm having some issues with the parallel parts of my code. I have a couple of functions written in -jl files which I include at the beginning of my code, with each of these files containing the relevant using statements to load the modules they are depending on. In 0.3.11, I simply did:   everywhere begin   include  functions1-jl     include  functions2-jl     ... end  to define all the functions needed in the computation on all workers. Doing this now however results in one  WARNING: replacing module X  for each using statement, plus, in the case of PyCall, in a bunch of other warnings methods that couldn't be imported, modules that should have been imported, and method defintions that are being overwritten.  What is the correct way to define functions and import modules on all workers in 0.4?