[Akonadi] [Bug 330215] New: Crash in QPSQL driver when shutting down Akonadi

[Daniel Vrátil]

https://bugs.kde.org/show_bug.cgi?id=330215

            Bug ID: 330215
           Summary: Crash in QPSQL driver when shutting down Akonadi
    Classification: Unclassified
           Product: Akonadi
           Version: 1.11.0
          Platform: unspecified
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: server
          Assignee: kdepim-bugs at kde.org
          Reporter: dvratil at redhat.com

QPSQL driver crashes when destroying QSqlQueries cached in QueryCache, because
they are being destroyed after QSqlDatabase connection has been closed.

I think this is a bug in Qt because, because it should check whether QSqlDriver
has already been deleted before using it. I checked Qt5 code and it should be
fine there. Anyway we should 
workaround this in Akonadi.

    Program received signal SIGSEGV, Segmentation fault.
    parseInput (conn=conn at entry=0x40000000b) at fe-exec.c:1646
    1646            if (PG_PROTOCOL_MAJOR(conn->pversion) >= 3)
    (gdb) bt
    #0  parseInput (conn=conn at entry=0x40000000b) at fe-exec.c:1646
    #1  0x00007f5836497b08 in PQgetResult (conn=conn at entry=0x40000000b) at
fe-exec.c:1722
    #2  0x00007f5836497d8f in PQexecStart (conn=conn at entry=0x40000000b) at
fe-exec.c:1895
    #3  0x00007f5836497f41 in PQexec (conn=0x40000000b, query=0xd55a98
"DEALLOCATE qpsqlpstmt_e4") at fe-exec.c:1804
    #4  0x00007f58366bdd78 in QPSQLDriverPrivate::exec (this=0xda1870,
stmt=<optimized out>) at ../../../sql/drivers/psql/qsql_psql.cpp:177
    #5  0x00007f58366be324 in QPSQLDriverPrivate::exec (this=0xda1870,
stmt="DEALLOCATE qpsqlpstmt_e4") at ../../../sql/drivers/psql/qsql_psql.cpp:187
    #6  0x00007f58366be45e in qDeallocatePreparedStmt (d=d at entry=0xda14c0) at
../../../sql/drivers/psql/qsql_psql.cpp:288
    #7  0x00007f58366be877 in QPSQLResult::~QPSQLResult (this=0xf0fa90,
__in_chrg=<optimized out>) at ../../../sql/drivers/psql/qsql_psql.cpp:309
    #8  0x00007f58366be8d9 in QPSQLResult::~QPSQLResult (this=0xf0fa90,
__in_chrg=<optimized out>) at ../../../sql/drivers/psql/qsql_psql.cpp:312
    #9  0x0000003a7421182e in QSqlQuery::~QSqlQuery (this=0x40000000b,
__in_chrg=<optimized out>) at kernel/qsqlquery.cpp:245
    #10 0x000000000057e3d5 in QHashNode<QString, QSqlQuery>::~QHashNode
(this=0xd705a0) at /usr/include/QtCore/qhash.h:216
    #11 0x000000000057e3a5 in QHashNode<QString, QSqlQuery>::~QHashNode
(this=0xd705a0) at /usr/include/QtCore/qhash.h:216
    #12 0x000000000057e32d in QHash<QString, QSqlQuery>::deleteNode2
(node=0xd705a0) at /usr/include/QtCore/qhash.h:521
    #13 0x0000003a6dc98799 in QHashData::free_helper (this=0xd77ff0,
node_delete=0x57e310 <QHash<QString,
QSqlQuery>::deleteNode2(QHashData::Node*)>) at tools/qhash.cpp:275
    #14 0x000000000057e364 in QHash<QString, QSqlQuery>::freeData
(this=0xd70540, x=0xd77ff0) at /usr/include/QtCore/qhash.h:570
    #15 0x000000000057e576 in QHash<QString, QSqlQuery>::~QHash (this=0xd70540)
at /usr/include/QtCore/qhash.h:283
    #16 0x000000000057e525 in QHash<QString, QSqlQuery>::~QHash (this=0xd70540)
at /usr/include/QtCore/qhash.h:283
    #17 0x000000000057e4f8 in Cache::~Cache (this=0xd70530) at
/home/progdan/projects/kde/akonadi/server/src/storage/querycache.cpp:34
    #18 0x000000000057de05 in Cache::~Cache (this=0xd70530) at
/home/progdan/projects/kde/akonadi/server/src/storage/querycache.cpp:34
    #19 0x000000000057de29 in Cache::~Cache (this=0xd70530) at
/home/progdan/projects/kde/akonadi/server/src/storage/querycache.cpp:34
    #20 0x000000000057e4a2 in qThreadStorage_deleteData<Cache> (d=0xd70530) at
/usr/include/QtCore/qthreadstorage.h:97
    #21 0x000000000057e45f in QThreadStorage<Cache*>::deleteData (x=0xd70530)
at /usr/include/QtCore/qthreadstorage.h:140
    #22 0x0000003a6dc7a44a in QThreadStorageData::finish (p=0xd51d98) at
thread/qthreadstorage.cpp:203
    #23 0x0000003a6dd872d1 in QCoreApplicationPrivate::~QCoreApplicationPrivate
(this=0xd51f90, __in_chrg=<optimized out>) at kernel/qcoreapplication.cpp:473
    #24 0x0000003a6dd874c9 in QCoreApplicationPrivate::~QCoreApplicationPrivate
(this=0xd51f90, __in_chrg=<optimized out>) at kernel/qcoreapplication.cpp:490
    #25 0x0000003a6dd9e065 in cleanup (pointer=<optimized out>) at
../../src/corelib/tools/qscopedpointer.h:62
    #26 ~QScopedPointer (this=0xd51f78, __in_chrg=<optimized out>) at
../../src/corelib/tools/qscopedpointer.h:100
    #27 QObject::~QObject (this=0xd51f70, __in_chrg=<optimized out>) at
kernel/qobject.cpp:816
    #28 0x0000003a6dd88249 in QCoreApplication::~QCoreApplication
(this=0xd51f70, __in_chrg=<optimized out>) at kernel/qcoreapplication.cpp:865
    #29 0x00000000004a07fe in QScopedPointerDeleter<QCoreApplication>::cleanup
(pointer=0xd51f70) at /usr/include/QtCore/qscopedpointer.h:62
    #30 0x00000000004a88bf in QScopedPointer<QCoreApplication,
QScopedPointerDeleter<QCoreApplication> >::~QScopedPointer
(this=0x7ffff65a2a70) at /usr/include/QtCore/qscopedpointer.h:100
    #31 0x00000000004a29a5 in QScopedPointer<QCoreApplication,
QScopedPointerDeleter<QCoreApplication> >::~QScopedPointer
(this=0x7ffff65a2a70) at /usr/include/QtCore/qscopedpointer.h:98
    #32 0x00000000004a1930 in AkApplication::~AkApplication
(this=0x7ffff65a2a60) at
/home/progdan/projects/kde/akonadi/shared/akapplication.cpp:45
    #33 0x00000000004a0825 in
AkApplicationImpl<QCoreApplication>::~AkApplicationImpl (this=0x7ffff65a2a60)
at /home/progdan/projects/kde/akonadi/shared/akapplication.h:84
    #34 0x00000000004a0275 in
AkApplicationImpl<QCoreApplication>::~AkApplicationImpl (this=0x7ffff65a2a60)
at /home/progdan/projects/kde/akonadi/shared/akapplication.h:84
    #35 0x000000000049ffac in main (argc=1, argv=0x7ffff65a2cb8) at
/home/progdan/projects/kde/akonadi/server/src/main.cpp:83



Reproducible: Always

Steps to Reproduce:
1. Use QPSQL backend with Akonadi
2. Use Akonadi a little so that there are some queries in QueryCache
3. akonadictl stop
Actual Results:  
Crash

Expected Results:  
No crash

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