Hi Dima!

This looks like https://bugreports.qt.io/browse/QTBUG-58508 to me.
According to that bug, it is fixed in Qt 5.11, however the change is too
large to backport to 5.9.

Exporting QML_DISABLE_DISK_CACHE=1 should help as a workaround — can you
try that?

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src in Ubuntu.

  twinkle doesn't start (stack smashing detected) (Lubuntu 18.04)

Status in qtdeclarative-opensource-src package in Ubuntu:
Status in twinkle package in Ubuntu:

Bug description:
  The console output:

  $ twinkle 
  QApplication: invalid style override passed, ignoring it.
  Language name: "en"
  mprotect failed in ExecutableAllocator::makeExecutable: Permission denied
  *** stack smashing detected ***: <unknown> terminated
  Aborted (core dumped)

  I've attached a strace output file.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: twinkle 1:1.10.1+dfsg-3
  ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
  Uname: Linux 4.15.0-47-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CurrentDesktop: LXDE
  Date: Tue Apr 16 15:29:30 2019
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2018-06-11 (309 days ago)
  InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
  SourcePackage: twinkle
  UpgradeStatus: No upgrade log present (probably fresh install)

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