Trying to reproduce runtime error with persistent and runMigrationSilent

LICENSE

Copyright Tim Baumann (c) 2016

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.

    * Neither the name of Tim Baumann nor the names of other
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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Main.hs

{-# LANGUAGE EmptyDataDecls             #-}
{-# LANGUAGE FlexibleContexts           #-}
{-# LANGUAGE GADTs                      #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses      #-}
{-# LANGUAGE OverloadedStrings          #-}
{-# LANGUAGE QuasiQuotes                #-}
{-# LANGUAGE TemplateHaskell            #-}
{-# LANGUAGE TypeFamilies               #-}

module Main (main) where
  
import Control.Concurrent (forkIO)
import Control.Concurrent.Async (asyncBound, wait)
import Control.Monad (forM_, void)
import Control.Monad.IO.Class  (liftIO)
import Control.Monad.Logger (runStderrLoggingT)
import Database.Persist
import Database.Persist.Postgresql
import Database.Persist.TH
import System.IO (hPutStrLn, hFlush, stdout, stderr)
import qualified Data.Text as T
import qualified Data.Text.IO as T

share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Person
    name String
    age Int Maybe
    deriving Show
|]

connStr :: ConnectionString
connStr = "host=localhost port=5432 user=tim dbname=tim password="

main :: IO ()
main = do
  w1 <- asyncBound migrationWorker
  w2 <- asyncBound migrationWorker
  w3 <- asyncBound putStrLnWorker
  --w4 <- asyncBound putStrLnWorker
  wait w1
  wait w2
  wait w3
  --wait w4
  where
    migrationWorker = do
      runStderrLoggingT $
        withPostgresqlConn connStr $
          runSqlConn $ do
            forM_ [1..1000] $ \_i -> do
              migrationSql <- runMigrationSilent migrateAll
              liftIO $ T.hPutStrLn stderr $ T.unlines migrationSql
              --liftIO $ T.hPutStrLn stdout $ T.unlines migrationSql
              return ()
    putStrLnWorker = do
      forM_ [1..10000] $ \_i -> do
        hPutStrLn stderr "Hallo Welt!"
        hFlush stderr

run-migration-silent-not-threadsafe.cabal

name:                run-migration-silent-not-threadsafe
version:             0.1.0.0
synopsis:            Initial project template from stack
description:         Please see README.md
homepage:            https://github.com/timjb/run-migration-silent-not-threadsafe#readme
license:             BSD3
license-file:        LICENSE
author:              Tim Baumann
maintainer:          tim@timbaumann.info
copyright:           MIT License
category:            Web
build-type:          Simple
-- extra-source-files:
cabal-version:       >=1.10

executable run-migration-silent-not-threadsafe-exe
  hs-source-dirs:      .
  main-is:             Main.hs
  ghc-options:         -O2 -threaded -rtsopts -with-rtsopts=-N
  build-depends:
    base,
    persistent,
    persistent-template,
    persistent-postgresql,
    async,
    monad-logger,
    text
  default-language:    Haskell2010

Setup.hs

import Distribution.Simple
main = defaultMain

stack.yaml

# This file was automatically generated by 'stack init'
#
# Some commonly used options have been documented as comments in this file.
# For advanced use and comprehensive documentation of the format, please see:
# http://docs.haskellstack.org/en/stable/yaml_configuration/

# Resolver to choose a 'specific' stackage snapshot or a compiler version.
# A snapshot resolver dictates the compiler version and the set of packages
# to be used for project dependencies. For example:
#
# resolver: lts-3.5
# resolver: nightly-2015-09-21
# resolver: ghc-7.10.2
# resolver: ghcjs-0.1.0_ghc-7.10.2
# resolver:
#  name: custom-snapshot
#  location: "./custom-snapshot.yaml"
resolver: lts-7.3

# User packages to be built.
# Various formats can be used as shown in the example below.
#
# packages:
# - some-directory
# - https://example.com/foo/bar/baz-0.0.2.tar.gz
# - location:
#    git: https://github.com/commercialhaskell/stack.git
#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
#   extra-dep: true
#  subdirs:
#  - auto-update
#  - wai
#
# A package marked 'extra-dep: true' will only be built if demanded by a
# non-dependency (i.e. a user package), and its test suites and benchmarks
# will not be run. This is useful for tweaking upstream packages.
packages:
- '.'
# Dependency packages to be pulled from upstream that are not in the resolver
# (e.g., acme-missiles-0.3)
extra-deps: []

# Override default flag values for local packages and extra-deps
flags: {}

# Extra package databases containing global packages
extra-package-dbs: []

#docker:
#  enable: true

# Control whether we use the GHC we find on the path
# system-ghc: true
#
# Require a specific version of stack, using version ranges
# require-stack-version: -any # Default
# require-stack-version: ">=1.2"
#
# Override the architecture used by stack, especially useful on Windows
# arch: i386
# arch: x86_64
#
# Extra directories used by stack for building
# extra-include-dirs: [/path/to/dir]
# extra-lib-dirs: [/path/to/dir]
#
# Allow a newer minor version of GHC than the snapshot specifies
# compiler-check: newer-minor