https://bugs.kde.org/show_bug.cgi?id=496972
--- Comment #1 from Paul Floyd <pjfl...@wanadoo.fr> ---
The first error happens very early on.
Running under vgdb and using step-instruction to get back somewhere with a
stack
#0 0x0000000008523e0d in ?? () from /usr/local/lib/libpcre2-16.so.0
#1 0x0000000008523d46 in pcre2_jit_match_16 () from
/usr/local/lib/libpcre2-16.so.0
#2 0x000000000855c19f in pcre2_match_16 () from
/usr/local/lib/libpcre2-16.so.0
#3 0x0000000006507f52 in ?? () from /usr/local/lib/qt6/libQt6Core.so.6
#4 0x0000000006507d2f in ?? () from /usr/local/lib/qt6/libQt6Core.so.6
#5 0x00000000065089de in QRegularExpression::match(QString const&, long long,
QRegularExpression::MatchType, QFlags<QRegularExpression::MatchOption>) const
()
from /usr/local/lib/qt6/libQt6Core.so.6
#6 0x0000000006304ed6 in ?? () from /usr/local/lib/qt6/libQt6Core.so.6
#7 0x00000000063049de in ?? () from /usr/local/lib/qt6/libQt6Core.so.6
#8 0x00000000063054f5 in QDirIterator::nextFileInfo() () from
/usr/local/lib/qt6/libQt6Core.so.6
#9 0x00000000062fa62d in QDir::entryInfoList(QList<QString> const&,
QFlags<QDir::Filter>, QFlags<QDir::SortFlag>) const () from
/usr/local/lib/qt6/libQt6Core.so.6
#10 0x0000000000210a8a in ?? ()
#11 0x00000000002135ac in ?? ()
#12 0x0000000006844a6a in __libc_start1 (argc=1, argv=0x1ffffff408,
env=0x1ffffff418, cleanup=<optimized out>, mainX=0x211d10) at
/usr/src/lib/libc/csu/libc_start1.c:157
#13 0x00000000002106e0 in ?? ()
Going up to that call to "match" and looking at the first argument
(gdb) x /500c $rdi
0xccbbfc0: 83 'S' 0 '\000' 111 'o' 0 '\000' 117 'u' 0
'\000' 114 'r' 0 '\000'
0xccbbfc8: 99 'c' 0 '\000' 101 'e' 0 '\000' 67 'C' 0
'\000' 111 'o' 0 '\000'
0xccbbfd0: 100 'd' 0 '\000' 101 'e' 0 '\000' 80 'P' 0
'\000' 114 'r' 0 '\000'
0xccbbfd8: 111 'o' 0 '\000' 46 '.' 0 '\000' 116 't' 0
'\000' 120 'x' 0 '\000'
0xccbbfe0: 116 't' 0 '\000' 0 '\000' 0 '\000' 0
'\000' 0 '\000' 0 '\000' 0 '\000'
Huh? I thought that "this" would be in $rdi. That looks like
"SourceCodePro.txt" in wide characters. That's the name of a file in
/usr/local/share/qtcreator/fonts.
Maybe this code
void QFreeTypeFontDatabase::populateFontDatabase()
{
QString fontpath = fontDir();
QDir dir(fontpath);
if (!dir.exists()) {
qWarning("QFontDatabase: Cannot find font directory %s.\n"
"Note that Qt no longer ships fonts. Deploy some (from
https://dejavu-fonts.github.io/ for example) or switch to fontconfig.",
qPrintable(fontpath));
return;
}
static const QString nameFilters[] = {
u"*.ttf"_s,
u"*.pfa"_s,
u"*.pfb"_s,
u"*.otf"_s,
};
const auto fis =
dir.entryInfoList(QStringList::fromReadOnlyData(nameFilters), QDir::Files);
for (const QFileInfo &fi : fis) {
const QByteArray file = QFile::encodeName(fi.absoluteFilePath());
QFreeTypeFontDatabase::addTTFile(QByteArray(), file);
}
}
Making that into a small exe as follows
#include <QDir>
#include <QString>
#include <QStringList>
#include <iostream>
using namespace Qt::Literals::StringLiterals;
int main()
{
QString fontpath = "/usr/local/share/qtcreator/fonts";
QDir dir(fontpath);
static const QString nameFilters[] = {
u"*.ttf"_s,
u"*.pfa"_s,
u"*.pfb"_s,
u"*.otf"_s,
};
const auto fis =
dir.entryInfoList(QStringList::fromReadOnlyData(nameFilters), QDir::Files);
for (const QFileInfo &fi : fis) {
const QByteArray file = QFile::encodeName(fi.absoluteFilePath());
std::cout << "foo " << file.toStdString() << std::endl;
}
}
produces
==26438== Memcheck, a memory error detector
==26438== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==26438== Using Valgrind-3.24.0.GIT and LibVEX; rerun with -h for copyright
info
==26438== Command: ././build/Desktop-Debug/bug496972
==26438==
==26438== Conditional jump or move depends on uninitialised value(s)
==26438== at 0x6B15CA1: ???
==26438== by 0x670C9AF: ???
==26438==
==26438== Conditional jump or move depends on uninitialised value(s)
==26438== at 0x6B14F41: ???
==26438== by 0x670C9AF: ???
==26438==
==26438== Conditional jump or move depends on uninitialised value(s)
==26438== at 0x6B141E1: ???
==26438== by 0x670C9AF: ???
==26438==
==26438== Conditional jump or move depends on uninitialised value(s)
==26438== at 0x6B13481: ???
==26438== by 0x670C9AF: ???
==26438==
foo /usr/local/share/qtcreator/fonts/SourceCodePro-Bold.ttf
foo /usr/local/share/qtcreator/fonts/SourceCodePro-BoldIt.ttf
foo /usr/local/share/qtcreator/fonts/SourceCodePro-It.ttf
foo /usr/local/share/qtcreator/fonts/SourceCodePro-Medium.ttf
foo /usr/local/share/qtcreator/fonts/SourceCodePro-MediumIt.ttf
foo /usr/local/share/qtcreator/fonts/SourceCodePro-Regular.ttf
With a debug libpcre2.so that's in
(gdb) list
58 local_stack.min_start = local_space;
59 local_stack.start = local_space;
60 local_stack.end = local_space + MACHINE_STACK_SIZE;
61 local_stack.top = local_space + MACHINE_STACK_SIZE;
62 arguments->stack = &local_stack;
63 return executable_func(arguments);
64 }
Still not sure if this is Valgrind not getting the SMC right or some probably
harmless error in the jitted pcre2 expression.
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