[Nepomuk] Review Request: Fix crash in nepomuk services after a timeout

[Vishesh Handa]

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http://git.reviewboard.kde.org/r/105507/#review15632
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Ship it!


Could you please add a FIXME in the comment? Just so that it becomes more obvious.

- Vishesh Handa


On July 10, 2012, 3:57 p.m., David Faure wrote:
> 
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> http://git.reviewboard.kde.org/r/105507/
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> 
> (Updated July 10, 2012, 3:57 p.m.)
> 
> 
> Review request for Nepomuk and Release Team.
> 
> 
> Description
> -------
> 
> Fix crash due to other threads using the model at the time it gets deleted. No proper solution found though, with the current API.
> 
> 
> Diffs
> -----
> 
>   libnepomukcore/resource/nepomukmainmodel.cpp ba2626f 
> 
> Diff: http://git.reviewboard.kde.org/r/105507/diff/
> 
> 
> Testing
> -------
> 
> Running nepomukqueryservice in valgrind gave this:
> 
> "/d/kde/inst/kde4.9/bin/nepomukservicestub(19732)" Soprano: "Timeout (5)": "Command timed out."
> ==19732== Thread 3:
> ==19732== Invalid read of size 8
> ==19732==    at 0xC5AB6DA: QPointer<Soprano::Client::ClientConnection>::operator->() const (qpointer.h:74)
> ==19732==    by 0xC5AA70A: Soprano::Client::ClientModel::executeQuery(QString const&, Soprano::Query::QueryLanguage, QString const&) const (clientmodel.cpp:106)
> ==19732==    by 0x68E9319: Nepomuk2::MainModel::executeQuery(QString const&, Soprano::Query::QueryLanguage, QString const&) const (nepomukmainmodel.cpp:182)
> ==19732==    by 0x12BDDEED: Nepomuk2::Query::SearchRunnable::run() (searchrunnable.cpp:89)
> ==19732==    by 0x4ECA2FC: QThreadPoolThread::run() (qthreadpool.cpp:107)
> ==19732==    by 0x4EDAF27: QThreadPrivate::start(void*) (qthread_unix.cpp:307)
> ==19732==    by 0x53CCF04: start_thread (in /lib64/libpthread-2.14.1.so)
> ==19732==    by 0x86CD10C: clone (in /lib64/libc-2.14.1.so)
> ==19732==  Address 0x117af938 is 72 bytes inside a block of size 80 free'd
> ==19732==    at 0x4C28706: operator delete(void*) (vg_replace_malloc.c:457)
> ==19732==    by 0xC5AA2ED: Soprano::Client::ClientModel::~ClientModel() (clientmodel.cpp:58)
> ==19732==    by 0x68E8BAB: (anonymous namespace)::GlobalModelContainer::init(bool) (nepomukmainmodel.cpp:82)
> ==19732==    by 0x68E8E58: (anonymous namespace)::GlobalModelContainer::model() (nepomukmainmodel.cpp:100)
> ==19732==    by 0x68E932D: Nepomuk2::MainModel::executeQuery(QString const&, Soprano::Query::QueryLanguage, QString const&) const (nepomukmainmodel.cpp:183)
> ==19732==    by 0x12BDDEED: Nepomuk2::Query::SearchRunnable::run() (searchrunnable.cpp:89)
> ==19732==    by 0x4ECA2FC: QThreadPoolThread::run() (qthreadpool.cpp:107)
> ==19732==    by 0x4EDAF27: QThreadPrivate::start(void*) (qthread_unix.cpp:307)
> ==19732==    by 0x53CCF04: start_thread (in /lib64/libpthread-2.14.1.so)
> ==19732==    by 0x86CD10C: clone (in /lib64/libc-2.14.1.so)
> ==19732== 
> 
> No crash anymore after this "fix"...
> 
> 
> Thanks,
> 
> David Faure
> 
>

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