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[Marius Gripsgard  <2111216@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

We're encountering a critical issue in Qt 5.15.13 as shipped in Ubuntu
24.04 (Noble). The Qt V4 JIT engine occasionally generates invalid
machine code, resulting in crashes at runtime.

This issue is tracked upstream as QTBUG-111935 [0], and was fixed in Qt
5.15.14.

Symptoms:
    * Application crashes with segmentation faults or illegal instruction errors when executing certain JavaScript in QML (GC).
    * The issue appears to stem from bad register allocation or incorrect code paths during JIT compilation.

Affected Package:
qtdeclarative-opensource-src version 5.15.13 in Ubuntu Noble

Upstream Fix:

Commit that resolves the issue:

qt/qtdeclarative@3bd18f4 [1] or attached patch
    JIT: Add missing {STORE|LOAD}_ACC() to CreateCallContext

Would it be possible to Cherry-pick the above fix into the current Qt
5.15.13 package in Noble?

I’m only able to apply a downstream patch for now, but would prefer a
shared fix in the official archive if feasible.

Thanks for considering this!

[0] https://bugreports.qt.io/browse/QTBUG-111935
[1] https://github.com/qt/qtdeclarative/commit/3bd18f41cfb0f3da65eecf216e49a9bb6bda71a6

— Marius

** Affects: qtdeclarative-opensource-src (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "0001-JIT-Add-missing-STORE-LOAD-_ACC-to-CreateCallContext.patch"
   https://bugs.launchpad.net/bugs/2111216/+attachment/5878547/+files/0001-JIT-Add-missing-STORE-LOAD-_ACC-to-CreateCallContext.patch

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Ubuntu.
https://bugs.launchpad.net/bugs/2111216

Title:
  Qt V4 JIT engine generates bad JIT code

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

Bug description:
  We're encountering a critical issue in Qt 5.15.13 as shipped in Ubuntu
  24.04 (Noble). The Qt V4 JIT engine occasionally generates invalid
  machine code, resulting in crashes at runtime.

  This issue is tracked upstream as QTBUG-111935 [0], and was fixed in
  Qt 5.15.14.

  Symptoms:
      * Application crashes with segmentation faults or illegal instruction errors when executing certain JavaScript in QML (GC).
      * The issue appears to stem from bad register allocation or incorrect code paths during JIT compilation.

  Affected Package:
  qtdeclarative-opensource-src version 5.15.13 in Ubuntu Noble

  Upstream Fix:

  Commit that resolves the issue:

  qt/qtdeclarative@3bd18f4 [1] or attached patch
      JIT: Add missing {STORE|LOAD}_ACC() to CreateCallContext

  Would it be possible to Cherry-pick the above fix into the current Qt
  5.15.13 package in Noble?

  I’m only able to apply a downstream patch for now, but would prefer a
  shared fix in the official archive if feasible.

  Thanks for considering this!

  [0] https://bugreports.qt.io/browse/QTBUG-111935
  [1] https://github.com/qt/qtdeclarative/commit/3bd18f41cfb0f3da65eecf216e49a9bb6bda71a6

  — Marius

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