Details
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Bug
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Resolution: Cannot Reproduce
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P2: Important
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None
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6.6.2, 6.7.2
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None
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Debian GNU/Linux sid (with Qt 6.6.2) and experimental (with Qt 6.7.2), also happens in Ubuntu 24.10
(experimental_arm64-dchroot)mitya57@amdahl:~$ /usr/lib/qt6/bin/qmake --version
QMake version 3.1
Using Qt version 6.7.2 in /usr/lib/aarch64-linux-gnu
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Linux/X11
Description
In Debian, we are passing a qtconf file to qmake to make sure it produces the correct result when cross-building. On arm64, this file has the following content:
(experimental_arm64-dchroot)mitya57@amdahl:~/qtbase-everywhere-src-6.7.2$ cat /usr/lib/aarch64-linux-gnu/qt6/qt6.conf [Paths] Prefix=/usr ArchData=lib/aarch64-linux-gnu/qt6 Binaries=lib/qt6/bin Data=share/qt6 Documentation=share/qt6/doc Headers=include/aarch64-linux-gnu/qt6 HostBinaries=lib/qt6/bin HostData=lib/aarch64-linux-gnu/qt6 HostLibraries=lib/aarch64-linux-gnu HostLibraryExecutables=lib/qt6/libexec Libraries=lib/aarch64-linux-gnu LibraryExecutables=lib/qt6/libexec Plugins=lib/aarch64-linux-gnu/qt6/plugins Qml2Imports=lib/aarch64-linux-gnu/qt6/qml Settings=/etc/xdg Translations=share/qt6/translations
Recently, qmake -query started crashing on arm64 (aarch64) when a qtconf file is passed. Here is a gdb session:
(experimental_arm64-dchroot)mitya57@amdahl:~/qtbase-everywhere-src-6.7.2$ gdb /usr/lib/qt6/bin/qmake GNU gdb (Debian 15.1-1) 15.1 Copyright (C) 2024 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "aarch64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/lib/qt6/bin/qmake... Reading symbols from /usr/lib/debug/.build-id/6e/8118917128e07f0824c299fefb042251626a1c.debug... (gdb) r -qtconf /usr/lib/aarch64-linux-gnu/qt6/qt6.conf -query QT_INSTALL_PLUGINS Starting program: /usr/lib/qt6/bin/qmake -qtconf /usr/lib/aarch64-linux-gnu/qt6/qt6.conf -query QT_INSTALL_PLUGINS [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. _q_resolveEntryAndCreateLegacyEngine_recursive (entry=..., data=..., engine=@0xffffffffe678: 0x0, resolvingEntry=resolvingEntry@entry=false) at ./src/corelib/io/qfilesystemengine.cpp:108 108 QChar const ch = filePath[prefixSeparator]; (gdb) bt #0 _q_resolveEntryAndCreateLegacyEngine_recursive (entry=..., data=..., engine=@0xffffffffe678: 0x0, resolvingEntry=resolvingEntry@entry=false) at ./src/corelib/io/qfilesystemengine.cpp:108 #1 0x0000fffff7b4880c in QFileSystemEngine::resolveEntryAndCreateLegacyEngine (entry=..., data=...) at ./src/corelib/io/qfilesystemengine.cpp:161 #2 0x0000fffff7b48ba0 in QFileInfoPrivate::QFileInfoPrivate (this=0xaaaaaac2b710, file=...) at ./src/corelib/io/qfileinfo_p.h:69 #3 QFileInfo::QFileInfo (this=<optimized out>, path=..., this=<optimized out>, path=...) at ./src/corelib/io/qfileinfo.cpp:368 #4 0x0000fffff7b377f8 in QDir::isRelativePath (path=...) at ./src/corelib/io/qdir.cpp:2412 #5 0x0000aaaaaaab5e64 in QMakeLibraryInfo::rawLocation (loc=loc@entry=7, group=<optimized out>, group@entry=QMakeLibraryInfo::EffectiveSourcePaths) at ./qmake/qmakelibraryinfo.cpp:249 #6 0x0000aaaaaaab68b8 in QMakeProperty::reload (this=<optimized out>) at ./qmake/property.cpp:62 #7 0x0000aaaaaabbbd2c in QMakeProperty::QMakeProperty (this=0xffffffffeb10) at ./qmake/property.cpp:53 #8 runQMake (argc=<optimized out>, argv=argv@entry=0xfffffffff418) at ./qmake/main.cpp:485 #9 0x0000aaaaaaaaf9d8 in main (argc=<optimized out>, argv=0xfffffffff418) at ./qmake/main.cpp:578 (gdb) up 5 #5 0x0000aaaaaaab5e64 in QMakeLibraryInfo::rawLocation (loc=loc@entry=7, group=<optimized out>, group@entry=QMakeLibraryInfo::EffectiveSourcePaths) at ./qmake/qmakelibraryinfo.cpp:249 249 if (!ret.isEmpty() && QDir::isRelativePath(ret)) { (gdb) p ret $1 = {d = {d = 0x0, ptr = 0x0, size = 29}, static _empty = 0 u'\000'}
As you can see here, it crashes when loc == 7, which means QmlImportsPath (see LibraryPath enum). It is the only property for which there is a fallbackKey, so line 199 of qmake/qmakelibraryinfo.cpp is triggered.
It looks like the resulting string has the correct size allocated (29 matches length of lib/aarch64-linux-gnu/qt6/qml), however the string content is null. Probably this has something to do with QVariant to QString conversion, however I failed to produce a minimal example of this behavior.
I am happy to provide any additional debug info if needed.