Version:           3.5.5 (using KDE KDE 3.5.5)
Installed from:    Gentoo Packages
Compiler:          gcc (GCC) 3.4.6 (Gentoo 3.4.6-r2, ssp-3.4.6-1.0, pie-8.7.10 
OS:                Linux

I was holding the Ctrl key (while thinking), and Quanta abruptly crashed. Was editing a small files ~100 lines using PHP/HTML highlighting. I haven't been able to reproduce this at will, but it happens occasionally, and I'm always holding Ctrl when it does.

Crash trace:
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Using host libthread_db library "/lib/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1240992080 (LWP 25302)]
0xffffe410 in __kernel_vsyscall ()
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb610ce36 in nanosleep () from /lib/libc.so.6
#2  0xb610cc46 in sleep () from /lib/libc.so.6
#3  0xb6f700ba in KCrash::startDrKonqi ()
   from /usr/kde/3.5/lib/libkdecore.so.4
#4  0x00000004 in ?? ()
#5  0x089865e8 in ?? ()
#6  0xbfc93e90 in ?? ()
#7  0x0840adf0 in ?? ()
#8  0x0854c200 in ?? ()
#9  0xbfc93e90 in ?? ()
#10 0x00000008 in ?? ()
#11 0xbfc93ec0 in ?? ()
#12 0xbfc95ed0 in ?? ()
#13 0xbfc93ec0 in ?? ()
#14 0x0854c200 in ?? ()
#15 0x00000011 in ?? ()
#16 0xbfc90020 in ?? ()
#17 0x0000002c in ?? ()
#18 0xbfc93ea8 in ?? ()
#19 0xb6c05d26 in QLatin1Codec::toUnicode () from /usr/qt/3/lib/libqt-mt.so.3
Backtrace stopped: previous frame inner to this frame (corrupt stack?)