Crash in qt_scale_image_32bit

MuldeR

Hi.

I got a crash report from user, for my Qt 4.8.4-based application (Win32).

It is an ACCESS VIOLATION in qt_scale_image_32bit<Blend_ARGB32_on_ARGB32_SourceAlpha>

The problem is that:

I cannot reproduce the crash on my systems :-(
Only that specific user can reproduce the crash and only on one of his systems (it's an old Laptop with no SSE support, running on Windows XP)
It only happens with Release builds, the Debug build I provided didn't crash, he said
Disabling the "visual styles" in compatibility settings did not make a change (still crashed)
Running the app with 16-Bit color depth rather than 32-Bit doesn't trigger the crash

Detailed call stack:
@(e3c.3c0): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=ffffffff ebx=03e0236c ecx=ffffffff edx=ffffffff esi=02e74404 edi=00000000
eip=008f718b esp=0012ae40 ebp=0012aef0 iopl=0 nv up ei ng nz na pe cy
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010287
LameXP!qt_scale_image_32bit<Blend_ARGB32_on_ARGB32_SourceAlpha>+0x39b:
008f718b 8b3483 mov esi,dword ptr [ebx+eax*4] ds:0023:03e02368=????????
0:000> k
ChildEBP RetAddr
0012aef0 008f38c2 LameXP!qt_scale_image_32bit<Blend_ARGB32_on_ARGB32_SourceAlpha>+0x39b
0012af18 008ad69a LameXP!qt_scale_image_argb32_on_argb32+0x32
0012b150 008ac4dc LameXP!QRasterPaintEngine::drawImage+0x93a
0012b204 0071f88b LameXP!QRasterPaintEngine::drawPixmap+0x1dc
0012b314 005cbb33 LameXP!QPainter::drawPixmap+0x25b
0012b370 006cb5f0 LameXP!QPainter::drawPixmap+0x73
0012b4f0 006d82e7 LameXP!QConicalGradient::QConicalGradient+0x2340
0012ced0 00672ec8 LameXP!QPlastiqueStyle::drawControl+0x5877
0012cffc 005efc69 LameXP!QMenuBar::paintEvent+0x278
0012d0f4 00674222 LameXP!QWidget::event+0x619
0012d154 005ba39a LameXP!QMenuBar::event+0x252
0012d170 005b9c6f LameXP!QApplicationPrivate::notify_helper+0x9a
0012d430 0051e965 LameXP!QApplication::notify+0x136f
0012d470 005eb5c5 LameXP!QCoreApplication::notifyInternal+0x85
0012d550 005ebe1c LameXP!QWidgetPrivate::drawWidget+0x6e5
0012d5d8 005eb6f5 LameXP!QWidgetPrivate::paintSiblingsRecursive+0x36c
00000000 00000000 LameXP!QWidgetPrivate::drawWidget+0x815@

Has anybody seen this before? Or have an idea what could cause this ???

Regards,
MuldeR

tobias.hunger

Did you find anything in the "bug tracker":https://bugreports.qt-project.org/ ? If somebody has seen the issue before then it should be there.

MuldeR

Closest thing I found is:
https://bugreports.qt-project.org/browse/QTBUG-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:changehistory-tabpanel

But it's for v4.6.0, Closed and from 2009...

MuldeR

So, any more suggestions/ideas how I would go about this one?

I guess if I did open a bug report, I cannot provide a minimum example that reproduces the crash (as I cannot reproduce it myself at all), so it probably would be closed as "won't fix" right away...

Still the problem is very real, so what do I do next ???