QT 6.8.0: QSqlDatabase crashes on macOS

TheoSys

Hi,
I'm developing an application on my MacMini (macOS Sequoia 15.0.1). The application should access a PostgreSQL server on another machine. Unfortunately the application crashes at the moment I try to find out whether QPSQL is supported or not. The following code works fine on Linux, but crashes on my Mac:

QList<QSqlDatabase> TDatabase::mDbs;
int TDatabase::mConnection{0};
int TDatabase::mCurrent{-1};

void TDatabase::init()
{
    if (mDbs.size() > 0)
        return;

    QSqlDatabase db;

    if (!db.isDriverAvailable("QPSQL"))  //Crash here!!
    {
        MSG_ERROR("Fatal error: No PostgreSQL driver available!");
        abort();
    }

    db.addDatabase("QPSQL", connectionName());

    if (!db.isValid())
    {
        MSG_ERROR("Database driver for PostgreSQL is not available!");
        assert(db.isValid() == true);
    }

    db.setHostName(TConfig::getDbHost().c_str());
    db.setPort(TConfig::getDbPort());
    db.setDatabaseName(TConfig::getDbDatabase().c_str());
    db.setUserName(TConfig::getDbUser().c_str());
    db.setPassword(TConfig::getDbPasswd().c_str());

    if (!db.open())
    {
        QSqlError dberror = db.lastError();
        MSG_ERROR("Database error: " << dberror.databaseText().toStdString());
        MSG_ERROR("Driver error:   " << dberror.driverText().toStdString());
        MSG_ERROR("Error message:  " << dberror.text().toStdString());
        MSG_ERROR("Error code:     " << dberror.nativeErrorCode().toStdString());

        assert(db.open() == true);
    }

    mDbs.append(db);
    mCurrent = 0;
}

It don't get the error message in the 2nd if.
Here are some parts of my cmake file:

cmake_minimum_required(VERSION 3.10)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
....
find_package(QT NAMES Qt6 REQUIRED COMPONENTS Core Network Sql HttpServer Concurrent Core5Compat)
find_package(Qt6 REQUIRED COMPONENTS Core Network Sql HttpServer Concurrent Core5Compat)

find_package(OpenSSL REQUIRED)
set(PostgreSQL_INCLUDE_DIR /opt/homebrew/opt/libpq/include)
set(PostgreSQL_LIBRARY /opt/homebrew/opt/libpq/lib/libpq.a)
find_package(PostgreSQL REQUIRED)

set(TSports_SRC
    main.cpp
    ....
)

add_compile_options(-I/opt/homebrew/include -I/opt/homebrew/opt/libpq/include)
add_executable(tsports ${TSports_SRC})

target_link_libraries(tsports m pthread OpenSSL::SSL PostgreSQL::PostgreSQL Qt6::Core Qt6::Network Qt6::Sql Qt6::HttpServer Qt6::Concurrent Qt6::Core5Compat)
install(TARGETS tsports RUNTIME DESTINATION sbin)

Because it's working on Linux, I can't see the error. What's wrong with my code?

Some more information:
I installed brew and I'm using OpenSSL as well as the library libpq from brew as you can see from my cmake file. Could this be a problem? Should I get the source of PostgreSQL and compile the libraries myself?

A.T.

JonB

@TheoSys said in QT 6.8.0: QSqlDatabase crashes on macOS:

if (!db.isDriverAvailable("QPSQL")) //Crash here!!

Although it should not "crash" here, and of course you need to resolve that, what does QStringList QSqlDatabase::drivers() give you? One would assume that ought crash equally....

It don't get the error message in the 2nd if.

Well you wouldn't if your program actually "crashes" where you say. You might try letting it "crash" inside debugger and see what it shows, but from what you say it would be in internal Qt code.

Just checking you have created a Q-whatever-Application object by the time you execute this code?

I know nothing about Mac issues. You should probably state your exact Qt version.

IgKh

As always with crashes, attach the full stack trace when asking for help.

P.S 1: You are misusing the QSqlDatabase interface. You seem to be keeping QSqlDatabase instances in a static list, and that is a bad idea. QSqlDatabase itself already provides a way to access a connection when needed while handling the very subtle lifetime issues. You also use isDriverAvailable and more importantly addDatabase as instance methods when they are actually static methods; this is not a problem by itself, but it led you to thinking addDatabase is doing something else than it actually does.

Read the detailed description in the documentation very very carefully, and pay attention to the warnings and notes.

P.S 2: Your application doesn't need to link to libpq directly. The Qt SQL plugin for PostgreSQL is the one that needs to link to it, double check that the plugins/sqldrivers/libqsqlpsql.dylib in your Qt installation is linked to a proper libpq with otool.

SGaist

Hi,

Are you sure it's a crash ?
After all you have a call to abort in case QPSQL is not available.
As @IgKh wrote, you have to check that the plug-in can find libpsql which is likely the issue at hand.

TheoSys

@SGaist said in QT 6.8.0: QSqlDatabase crashes on macOS:

Are you sure it's a crash ?
After all you have a call to abort in case QPSQL is not available.

Before the abort() is a message printed out. I don't see this message which means it doesn't ever reach the abort().

However: I get no crash report, no core dump (yes, core dumps are enabled). It even doesn't write me a message that it made a core dump, which it does usually in such a case. It looks like that it silently aborts somewhere inside the class QSqlDatabase.

@IgKh said in QT 6.8.0: QSqlDatabase crashes on macOS:

P.S 1: You are misusing the QSqlDatabase interface. You seem to be keeping QSqlDatabase instances in a static list, and that is a bad idea. QSqlDatabase itself already provides a way to access a connection when needed while handling the very subtle lifetime issues. You also use isDriverAvailable and more importantly addDatabase as instance methods when they are actually static methods; this is not a problem by itself, but it led you to thinking addDatabase is doing something else than it actually does.

You're right. However: It doesn't even reach the point where this could be a problem.

@JonB said in QT 6.8.0: QSqlDatabase crashes on macOS:

Just checking you have created a Q-whatever-Application object by the time you execute this code?

Here is the main function:

int main (int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QCommandLineParser parser;

    parser.addOptions(
        {
            { "config", QCoreApplication::translate("main", "The path and name of the configuration file"),
              "config" },
            { "logfile", QCoreApplication::translate("main", "The path and name of the logfile"),
              "logfile" }
        }
    );

    parser.addHelpOption();
    parser.process(app);

    // Read configuration and/ or set defaults
    TConfig conf;

    if (!parser.value("config").isEmpty())
        conf.setConfigFile(parser.value("config").toStdString());

    if (!parser.value("logfile").isEmpty())
        conf.setLogFile(parser.value("logfile").toStdString());

    // Initialize server and wait for connections
    TServer server;
    app.exec();

    MSG_DEBUG("Server shutting down ...");
    int _exit = 0;

    // Free allocated memory and exit
    return _exit;
}

In fact the initializing of class TServer is also executing the database initialization. This is done before app.exec() is called. Could this be the problem? I'll try to change my code so that it will be called when the main application is initialized.

A.T.

Christian Ehrlicher

As long as a QCoreApplication is available it's fine - no need for a running event loop.
Use a debugger and see where it crashes.

JonB

@TheoSys said in QT 6.8.0: QSqlDatabase crashes on macOS:

Before the abort() is a message printed out. I don't see this message which means it doesn't ever reach the abort().

However: I get no crash report, no core dump (yes, core dumps are enabled). It even doesn't write me a message that it made a core dump, which it does usually in such a case. It looks like that it silently aborts somewhere inside the class QSqlDatabase.

I have no idea what any of this means. You chose to write

if (!db.isDriverAvailable("QPSQL")) //Crash here!!

Either it "crashes" which means you will see something, and certainly in the debugger, or it does not "crash", in which case your comment is wrong. If you get a "crash" under debugger it will show you a stack trace. If you do not get a "crash" it will not show you anything. If by any chance you claim it simply never returns from isDriverAvailable("QPSQL"), or during it it exit()s the program --- neither of which I think is likely --- neither of those are a "crash".

No idea what your MSG_ERROR() might do since it's not a part of Qt or C++. Whether it works or might fail I would not know.

I suggested you print out QStringList QSqlDatabase::drivers() but you don't seem to have acted on that. It is "not possible" for isDriverAvailable("QPSQL") to crash/hang/misbehave if you can access the drivers() list. Either QPSQL is in the QStringList or it is not. isDriverAvailable("QPSQL") does not do anything special about the fact that you are asking about "QPSQL".

IgKh

@TheoSys said in QT 6.8.0: QSqlDatabase crashes on macOS:

I don't see this message which means it doesn't ever reach the abort().

It doesn't necessarily mean that. It could just as well be that however MSG_ERROR is implemented, it writes via some sort of buffered IO, that doesn't get flushed due to the program abnormally exiting. The only way to confirm that at this point and with the available information is to step through the method with a debugger.

TheoSys

@JonB said in QT 6.8.0: QSqlDatabase crashes on macOS:

I suggested you print out QStringList QSqlDatabase::drivers() but you don't seem to have acted on that.

It prints nothing but crashes.
However: MacOS 15.0.1 changed the way core dumps are handled. Finally I found them and this is what I get:

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Process:               tsports [97965]
Path:                  /Users/USER/*/tsports
Identifier:            tsports
Version:               ???
Code Type:             ARM-64 (Native)
Parent Process:        launchd [1]
Responsible:           Terminal [82263]
User ID:               501

Date/Time:             2024-11-10 17:06:30.9083 +0100
OS Version:            macOS 15.0.1 (24A348)
Report Version:        12
Anonymous UUID:        45D4B423-91DF-ED45-CA23-12D05999B925

Sleep/Wake UUID:       76BEB25C-C59E-4263-BD80-CEBB51D2180D

Time Awake Since Boot: 200000 seconds
Time Since Wake:       20443 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000110
Exception Codes:       0x0000000000000001, 0x0000000000000110

Termination Reason:    Namespace SIGNAL, Code 11 Segmentation fault: 11
Terminating Process:   exc handler [97965]

VM Region Info: 0x110 is not in any region.  Bytes before following region: 4343889648
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      __TEXT                      102ea8000-102fe4000    [ 1264K] r-x/r-x SM=COW  /Users/USER/*/tsports

Application Specific Information:
*** multi-threaded process forked ***
crashed on child side of fork pre-exec


Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   libdispatch.dylib             	       0x18779d260 _dispatch_mgr_queue_push + 60
1   CarbonCore                    	       0x18b06cf68 connectToCoreServicesD() + 476
2   CarbonCore                    	       0x18b06cc38 getStatus() + 64
3   CarbonCore                    	       0x18b0700c4 scCreateSystemServiceVersion + 56
4   CarbonCore                    	       0x18b06ff38 FileIDTreeGetCachedPort + 276
5   CarbonCore                    	       0x18b06fca8 FSNodeStorageGetAndLockCurrentUniverse + 76
6   CarbonCore                    	       0x18b06fa90 FileIDTreeGetAndLockVolumeEntryForDeviceID + 88
7   CarbonCore                    	       0x18b06f8f8 FSMount::FSMount(unsigned int, FSMountNumberType, int*, unsigned int const*) + 92
8   CarbonCore                    	       0x18b06f854 FSMountPrepare + 76
9   CoreServicesInternal          	       0x18b3668a0 MountInfoPrepare + 68
10  CoreServicesInternal          	       0x18b390bd4 parseAttributeBuffer(__CFAllocator const*, unsigned char const*, unsigned char, attrlist const*, void const*, void**, _FileAttributes*, unsigned int*, unsigned char) + 2616
11  CoreServicesInternal          	       0x18b366250 corePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) + 1344
12  CoreServicesInternal          	       0x18b365c9c prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) + 460
13  CoreServicesInternal          	       0x18b362bac _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) + 232
14  CoreFoundation                	       0x1879fb708 CFURLCopyResourcePropertyForKey + 108
15  QtCore                        	       0x104d3c860 hasResourcePropertyFlag(QFileSystemMetaData const&, QFileSystemEntry const&, __CFString const*) + 224 (qfilesystemengine_unix.cpp:109)
16  QtCore                        	       0x104d3af00 QFileSystemEngine::fillMetaData(QFileSystemEntry const&, QFileSystemMetaData&, QFlags<QFileSystemMetaData::MetaDataFlag>) + 1780 (qfilesystemengine_unix.cpp:1005)
17  QtCore                        	       0x104b6d3d8 QDirEntryInfo::ensureFilled(QFlags<QFileSystemMetaData::MetaDataFlag>) + 24 (qdirentryinfo_p.h:29) [inlined]
18  QtCore                        	       0x104b6d3d8 QDirEntryInfo::isHidden() + 24 (qdirentryinfo_p.h:114) [inlined]
19  QtCore                        	       0x104b6d3d8 QDirListingPrivate::matchesFilters(QDirEntryInfo&) const + 328 (qdirlisting.cpp:506)
20  QtCore                        	       0x104b6d8a4 QDirListingPrivate::entryMatches(QDirEntryInfo&) + 12 (qdirlisting.cpp:306) [inlined]
21  QtCore                        	       0x104b6d8a4 QDirListingPrivate::advance() + 688 (qdirlisting.cpp:352)
22  QtCore                        	       0x104b6e440 QDirListing::next(QDirListing::DirEntry) + 8 (qdirlisting.cpp:805) [inlined]
23  QtCore                        	       0x104b6e440 QDirListing::const_iterator::operator++() + 8 (qdirlisting.h:122) [inlined]
24  QtCore                        	       0x104b6e440 QDirListing::begin() const + 140 (qdirlisting.cpp:756)
25  QtCore                        	       0x104c2dc2c QFactoryLoaderPrivate::updateSinglePath(QString const&) + 512 (qfactoryloader.cpp:314)
26  QtCore                        	       0x104c2d918 QFactoryLoader::update() + 260 (qfactoryloader.cpp:397)
27  QtCore                        	       0x104c2f2c0 QFactoryLoader::QFactoryLoader(char const*, QString const&, Qt::CaseSensitivity) + 192 (qfactoryloader.cpp:458)
28  QtSql                         	       0x1033334ac (anonymous namespace)::Q_QGS_loader::innerFunction(void*) + 64 (qsqldatabase.cpp:36) [inlined]
29  QtSql                         	       0x1033334ac QtGlobalStatic::Holder<(anonymous namespace)::Q_QGS_loader>::Holder() + 64 (qglobalstatic.h:37) [inlined]
30  QtSql                         	       0x1033334ac QtGlobalStatic::Holder<(anonymous namespace)::Q_QGS_loader>::Holder() + 64 (qglobalstatic.h:36) [inlined]
31  QtSql                         	       0x1033334ac QGlobalStatic<QtGlobalStatic::Holder<(anonymous namespace)::Q_QGS_loader>>::instance() + 80 (qglobalstatic.h:100) [inlined]
32  QtSql                         	       0x1033334ac QGlobalStatic<QtGlobalStatic::Holder<(anonymous namespace)::Q_QGS_loader>>::operator()() + 212 (qglobalstatic.h:82)
33  QtSql                         	       0x103333120 QSqlDatabase::drivers() + 72 (qsqldatabase.cpp:489)
34  QtSql                         	       0x103334324 QSqlDatabase::isDriverAvailable(QString const&) + 48 (qsqldatabase.cpp:1135)
35  tsports                       	       0x102fb1ac0 TDatabase::init() + 336
36  tsports                       	       0x102fb2718 TDatabase::first() + 128
37  tsports                       	       0x102f45df8 TUser::TUser() + 152
38  tsports                       	       0x102f24e58 TAuthenticate::TAuthenticate() + 56
39  tsports                       	       0x102f253b8 TAuthenticate::TAuthenticate() + 28
40  tsports                       	       0x102eb32e8 TServer::TServer() + 196
41  tsports                       	       0x102eb4984 TServer::TServer() + 28
42  tsports                       	       0x102eae0fc main + 2212
43  dyld                          	       0x1875c0274 start + 2840


Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x00000001ec086e40   x1: 0x000000014b004080   x2: 0x0000000000000000   x3: 0x00000001ec086e40
    x4: 0x000000018779d224   x5: 0x00000001ec0864d0   x6: 0x000000014b004080   x7: 0x0000000000000000
    x8: 0x00000001ec083320   x9: 0x0000000000000100  x10: 0x0000004000000000  x11: 0x0000000000000000
   x12: 0x0080000000000000  x13: 0x0000004000000001  x14: 0x001ffe8000000000  x15: 0x001ffe8000000000
   x16: 0xbb300001ec0864d0  x17: 0x6ae10001ec086e40  x18: 0x0000000000000000  x19: 0x000000014b004080
   x20: 0x000000014b004170  x21: 0x00000001ec0ab000  x22: 0x00000001ec0ab000  x23: 0x0000000000001903
   x24: 0x000000000100001c  x25: 0x0000000000000000  x26: 0x00000000d01fde0d  x27: 0x0000000000000000
   x28: 0x00000001ea089000   fp: 0x000000016cf53ca0   lr: 0x000000018b06cf68
    sp: 0x000000016cf53ca0   pc: 0x000000018779d260 cpsr: 0x40001000
   far: 0x0000000000000110  esr: 0x92000046 (Data Abort) byte write Translation fault

Binary Images:
       0x102ea8000 -        0x102fe3fff tsports (*) <255224f9-ccba-3824-bbe3-8aa99424a6d4> /Users/USER/*/tsports
       0x10325c000 -        0x1032e3fff libssl.3.dylib (*) <d6155905-1501-3a5a-a580-7905e267f8c2> /Volumes/VOLUME/*/libssl.3.dylib
       0x10332c000 -        0x10335bfff org.qt-project.QtSql (6.8) <bdc778a8-d4b6-38f9-8707-34bf18f347ab> /Volumes/VOLUME/*/QtSql.framework/Versions/A/QtSql
       0x1031fc000 -        0x103217fff org.qt-project.QtHttpServer (6.8) <ecb59bd4-08f8-39de-80a9-7ae3b050f0d5> /Volumes/VOLUME/*/QtHttpServer.framework/Versions/A/QtHttpServer
       0x1031b4000 -        0x1031b7fff org.qt-project.QtConcurrent (6.8) <9e1eed8f-bec6-3c03-b8bc-e722683e0ad4> /Volumes/VOLUME/*/QtConcurrent.framework/Versions/A/QtConcurrent
       0x103520000 -        0x1035cffff org.qt-project.QtCore5Compat (6.8) <30900940-be81-3326-87e1-c1d50942a14b> /Volumes/VOLUME/*/QtCore5Compat.framework/Versions/A/QtCore5Compat
       0x103a0c000 -        0x103cfbfff libcrypto.3.dylib (*) <0ef13b00-8944-3a1e-ac18-21753de7eedf> /Volumes/VOLUME/*/libcrypto.3.dylib
       0x1033f4000 -        0x103413fff org.qt-project.QtWebSockets (6.8) <6a66caf0-ba09-315f-8e21-c535658cb28d> /Volumes/VOLUME/*/QtWebSockets.framework/Versions/A/QtWebSockets
       0x103e28000 -        0x103f6bfff org.qt-project.QtNetwork (6.8) <2344b9d0-3d7c-3dba-aac6-da6b1335bd80> /Volumes/VOLUME/*/QtNetwork.framework/Versions/A/QtNetwork
       0x104b2c000 -        0x104fbffff org.qt-project.QtCore (6.8) <83b7182b-42a9-35dd-8b5b-7b2e891bcce1> /Volumes/VOLUME/*/QtCore.framework/Versions/A/QtCore
       0x10349c000 -        0x1034bbfff com.apple.security.csparser (3.0) <e42bb390-a01c-3bb4-b37b-9c7d282bec92> /System/Library/Frameworks/Security.framework/Versions/A/PlugIns/csparser.bundle/Contents/MacOS/csparser
       0x18778c000 -        0x1877d2fff libdispatch.dylib (*) <465565e8-ef8a-3188-80fa-598063c54161> /usr/lib/system/libdispatch.dylib
       0x18b06b000 -        0x18b360fff com.apple.CoreServices.CarbonCore (1333) <02a4bca7-031e-3472-a930-f02b4ea13f3a> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/CarbonCore
       0x18b361000 -        0x18b3a0ffb com.apple.CoreServicesInternal (505) <4ec74c60-6dee-3835-a203-fedab25c0ab3> /System/Library/PrivateFrameworks/CoreServicesInternal.framework/Versions/A/CoreServicesInternal
       0x1879ac000 -        0x187ea2fff com.apple.CoreFoundation (6.9) <1ad672c1-da68-3367-b947-93ae47652366> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
       0x1875ba000 -        0x18763c663 dyld (*) <40bedd20-da23-3b70-a9c2-a1c68a738762> /usr/lib/dyld
               0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=860.1M resident=0K(0%) swapped_out_or_unallocated=860.1M(100%)
Writable regions: Total=932.8M written=289K(0%) resident=289K(0%) swapped_out=0K(0%) unallocated=932.5M(100%)

                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Activity Tracing                   256K        1 
Kernel Alloc Once                   32K        1 
MALLOC                           923.2M       18 
MALLOC guard page                   96K        6 
STACK GUARD                       56.0M        1 
Stack                             9296K        4 
Stack Guard                         32K        2 
__AUTH                             966K      197 
__AUTH_CONST                      17.1M      344 
__DATA                            3906K      338 
__DATA_CONST                      13.2M      357 
__DATA_DIRTY                       691K      109 
__FONT_DATA                        2352        1 
__LINKEDIT                       586.8M       12 
__OBJC_RW                         2353K        1 
__TEXT                           273.3M      368 
__TPRO_CONST                       272K        2 
mapped file                       31.5M        4 
owned unmapped memory               32K        1 
page table in kernel               289K        1 
shared memory                       80K        4 
===========                     =======  ======= 
TOTAL                              1.9G     1772 



-----------
Full Report
-----------

{"app_name":"tsports","timestamp":"2024-11-10 17:06:34.00 +0100","app_version":"","slice_uuid":"255224f9-ccba-3824-bbe3-8aa99424a6d4","build_version":"","platform":1,"share_with_app_devs":0,"is_first_party":1,"bug_type":"309","os_version":"macOS 15.0.1 (24A348)","roots_installed":0,"incident_id":"D31FF3A4-5AF6-4A29-BCA8-9139693D6F90","name":"tsports"}
{
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  "procPath" : "\/Users\/USER\/*\/tsports",
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  "coalitionName" : "com.apple.Terminal",
  "crashReporterKey" : "45D4B423-91DF-ED45-CA23-12D05999B925",
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TheoSys

@IgKh said in QT 6.8.0: QSqlDatabase crashes on macOS:

It doesn't necessarily mean that. It could just as well be that however MSG_ERROR is implemented, it writes via some sort of buffered IO, that doesn't get flushed due to the program abnormally exiting. The only way to confirm that at this point and with the available information is to step through the method with a debugger.

This was developped by me and I use it in all my applications. In case you're interrested how it is implemented look at: terror.h and terror.cpp. This code is well tested and it prints messages into a file or on screen if no file was defined.

BTW: Stepping through with a debugger is difficult, because the program is a server detatching from terminal and is running in the background.

JonB

@TheoSys said in QT 6.8.0: QSqlDatabase crashes on macOS:

However: MacOS 15.0.1 changed the way core dumps are handled. Finally I found them and this is what I get:

I forget that I don't know how Macs might work! But when this happens from a program in the debugger doesn't the debugger at least tell you that the program has "terminated" or "is no longer running"? Else as you say you have absolutely no way of knowing something has happened.

15 QtCore 0x104d3c860 hasResourcePropertyFlag(QFileSystemMetaData const&, QFileSystemEntry const&, __CFString const*) + 224 (qfilesystemengine_unix.cpp:109)

You will have to wait for someone to suggest how this call from Qt can crash. Somewhere in CarbonCore.

IgKh

@TheoSys said in QT 6.8.0: QSqlDatabase crashes on macOS:

BTW: Stepping through with a debugger is difficult, because the program is a server detatching from terminal and is running in the background.

No problem, you can attach to it after it started with lldb (since you control the source, you can add a sleep in the start of main to give yourself enough time to find out the PID, attach to it, and set a breakpoint).

Finally I found them and this is what I get:

Hmm, this is tricky. The eventual crash is in Grand Central Dispatch while trying to post a message to the main thread. That would perhaps suggest that it expects the main event loop to be running at that point. Though it really shouldn't require it - I know for a fact that plugins can be used before the QCoreApplication::exec call, even on macOS.

The path that leads to the crash is the Qt plugin loader iterating over the plugin directory, and specifically trying to determine if a file is hidden through a macOS only code path. The FSMountPrepare call in the path is somewhat strange, it is as if the Qt installation is on some sort of special filesystem? A disk image maybe, or an external drive? I don't know the internals of Core Foundation to anything like that level.

I would first try to postpone the creation of the database connection to when the event loop has started by a single-shot timer and see if it helped.

Christian Ehrlicher

@IgKh said in QT 6.8.0: QSqlDatabase crashes on macOS:

I would first try to postpone the creation of the database connection to when the event loop has started by a single-shot timer and see if it helped.

QSqlDatabase has no such a requirement and it's clearly visible that this is not a QSql problem.
My best guess is that the filesystem in there is screwed up. Simply create a QDirListing and iterate over the Qt dir and I'm pretty sure it crashes as well. It might not crash for other directories.

IgKh

@Christian-Ehrlicher Yeah, I know that there is no such requirement. It was just a suggestion to confirm that this is the issue.

Also, the core dump shows that the QtSql framework bundle is in /Volumes/VOLUME/*/QtSql.framework/Versions/A/QtSql, so it further suggests that the Qt installation is on some sort of external media or other such unusual filesystem that needs auto-mounting (which in turn is what requires the main loop running, to contact some system daemon to do so).

TheoSys

@IgKh said in QT 6.8.0: QSqlDatabase crashes on macOS:

Also, the core dump shows that the QtSql framework bundle is in /Volumes/VOLUME/*/QtSql.framework/Versions/A/QtSql, so it further suggests that the Qt installation is on some sort of external media or other such unusual filesystem that needs auto-mounting (which in turn is what requires the main loop running, to contact some system daemon to do so).

This was the right hint for me. In fact the Qt framework is on an external disk. It is necessary to explicitely allow an application to access such a disk. A normal application would display a short dialog box and ask for permission. In my case this doesn't work. As I mentioned already above, the application is a daemon running in the background and has no graphical surface. Because of this it can't ask for permission. And this is the real problem.

I tried to overcome this and there are a few possibilities. One is to install the application on the main disk and start it from there. This requires all libraries to be part of the bundle. Another possibility (not tried yet) is to create a special configuration file which allows the access.
On macOS 15 all applications are running in a sandbox. Inside this sandbox the application can do whatever it want. But it has no rights to access files outside of the sandbox without explicit permission. You can find the details at: https://developer.apple.com/documentation/security/accessing-files-from-the-macos-app-sandbox.

A.T.