Reading from memfs file is not thread safe

[omohokcoj]

File content is inconsistent when reading a file from memfs simultaneously in multiple threads:

10.times { Thread.new { JSON.parse(File.read("/__enclose_io_memfs__/lib/ruby/gems/2.7.0/gems/motor-admin-0.1.56/ui/dist/manifest.json")) } }

/__enclose_io_memfs__/lib/ruby/2.7.0/json/common.rb:156:in `parse': 783: unexpected token at '.svg": "icons/zoom-money.svg", (JSON::ParserError)
  "zoom-out.svg": "icons/zoom-out.svg",
  "zoom-question.svg": "icons/zoom-question.svg"
}.svg": "icons/zoom-money.svg",
  "zoom-out.svg": "icons/zoom-out.svg",
  "zoom-question.svg": "icons/zoom-question.svg"
}int.svg",
  "accessible.svg": "icons/accessible.svg",
  "activity.svg": "icons/activity.svg",
  "ad.svg": "icons/ad.svg",
  "adjustments-alt.svg": "icons/adjustments-alt.svg",
  "adjustments-horizontal.svg": "icons/adjustments-horizontal.svg",

Also sometimes it could lead to app crash:

/__enclose_io_memfs__/lib/ruby/2.7.0/json/common.rb:156: [BUG] Segmentation fault at 0x0000000000000000
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin20]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports                SEGV received in SEGV handler