If the terminal is compiled in debug mode, running systemd-analyze security will crash：ASSERT: "rc <= 0xffff"

[wineee]

ASSERT: "rc <= 0xffff" in file /usr/include/x86_64-linux-gnu/qt6/QtCore/qchar.h, line 73
fish: Job 1, './build/example' terminated by signal SIGABRT (Abort)

The issue can be reproduced with qt 6.8 (Deepin) and qt 6.10 (NixOS), it seems related to emoji, as systemd-analyze security uses these emojis: 😐 🙁 😨

[wineee]

printf "\U1F3F4\U200D" Can also lead to the same crash

[liweitianux]

I had this exact same crash with a DEBUG-build qtermwidget.

Here is the backtrace, for reference:

#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0)
    at ./nptl/pthread_kill.c:44
#1  0x00007f7c0a09fdbf in __pthread_kill_internal (threadid=<optimized out>, signo=6) at ./nptl/pthread_kill.c:89
#2  0x00007f7c0a048d02 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3  0x00007f7c0a0304b2 in __GI_abort () at ./stdlib/abort.c:77
#4  0x00007f7c0a6df9e3 in ??? () at /usr/lib/x86_64-linux-gnu/libQt6Core.so.6
#5  0x00007f7c0a6e0511 in QMessageLogger::fatal(char const*, ...) const () at /usr/lib/x86_64-linux-gnu/libQt6Core.so.6
#6  0x00007f7c0a6dd45c in qt_assert(char const*, char const*, int) () at /usr/lib/x86_64-linux-gnu/libQt6Core.so.6
#7  0x00007f7c0c29cc13 in QChar::QChar<wchar_t, true> (this=0x7ffda41fa4fa, ch=128293 L'🔥')
    at /usr/include/x86_64-linux-gnu/qt6/QtCore/qchar.h:135
#8  0x00007f7c0c2b5e0d in Konsole::TerminalDisplay::updateImage (this=0x562afcf4c680)
    at /home/aly/git/lxqt/qtermwidget/lib/TerminalDisplay.cpp:1206
#9  0x00007f7c0c2db1db in Konsole::TerminalDisplay::qt_static_metacall
    (_o=0x562afcf4c680, _c=QMetaObject::InvokeMetaMethod, _id=13, _a=0x7ffda41fa798)
    at /home/aly/git/lxqt/qtermwidget/build/lib/moc_TerminalDisplay.cpp:247
...

The relevant QChar.h code:

 131     template <typename Char, if_implicit_conversion_char<Char> = true>
 132     constexpr Q_IMPLICIT QChar(const Char ch) noexcept : ucs(char16_t(ch)) {}
 133     template <typename Char, if_explicit_conversion_char<Char> = true>
 134     constexpr explicit QChar(const Char ch) noexcept
 135         : ucs((Q_ASSERT(char32_t(ch) <= 0xffff), char16_t(ch))) {}

And the relevant TerminalDisplay.cpp code:

 1197         if (dirtyMask[x])
 1198         {
 1199           wchar_t c = newLine[x+0].character;
 1200           if ( !c )
 1201               continue;
 1202           int p = 0;
 1203           disstrU[p++] = c; //fontMap(c);
 1204           bool lineDraw = isLineChar(newLine[x+0]);
 1205           bool doubleWidth = (x+1 == columnsToUpdate) ? false : (newLine[x+1].character == 0);
 1206           int charWidth = fm.horizontalAdvance(QChar(c));                                                           
 1207           bool bigWidth = _fixedFont && !doubleWidth && charWidth > _fontWidth;
 1208           bool smallWidth = _fixedFont && charWidth < _fontWidth;