Test Cases for multi threading Lua

This repository contains two test cases that are showing crashes using LuaJIT when native lua packages are loaded in other threads.

Tests

• test01 - uses lua-llthreads2 as threading library and lpeg as native lua package

• test02 - uses luaproc as threading library and luafilesystem as native lua package

Test Results for both tests:

• no crash with Lua 5.1, 5.2 and 5.3
• crash with LuaJIT 2.0 and 2.1 under Linux
• see Travis CI Results for result details

*** Error in `lua': double free or corruption (fasttop): 0x00007f43400008c0 ***

test01

    local llthreads = require("llthreads2.ex")
    
    local THREAD_COUNT = 1000
    
    local thread_code = function()
    
        local lpeg = require("lpeg") -- no crash without this line
    
        local loadstring = loadstring or load
        local x = 1
        while x < 1000 do 
            x = x + 1 
            -- do some work
            assert(x == loadstring("return "..x)())
        end
    end
    
    local threads = {}
    
    for i = 1, THREAD_COUNT do 
        local thread = llthreads.new(thread_code)
        threads[i] = thread
        thread:start()
    end
    
    for i = 1, THREAD_COUNT do 
        local thread = threads[i]
        thread:join()
    end
    print("OK.")

test02

    local luaproc = require("luaproc")
    
    local THREAD_COUNT = 1000
    luaproc.setnumworkers(THREAD_COUNT)
    
    local thread_code = function()
    
        local lpeg = require("lfs") -- no crash without this line
    
        local loadstring = loadstring or load
        local x = 1
        while x < 1000 do 
            x = x + 1 
            -- do some work
            assert(x == loadstring("return "..x)())
        end
    end
    
    local threads = {}
    
    for i = 1, THREAD_COUNT do 
        local thread = luaproc.newproc(thread_code)
        threads[i] = thread
    end
    
    luaproc.wait()
    
    print("OK.\n")