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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https://bugs.launchpad.net/bugs/2111216
Title:
Qt V4 JIT engine generates bad JIT code
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