Administrace komentářů

Obecně platí, že výstupy z nástrojů jako ASan či Valgrind je třeba umět interpretovat, jinak může člověk strávit hodiny pronásledováním neexistujících problémů.

1) Mám trochu problém s tím, že v té knihovně možná je chyba, která by se při dlouhodobějším používání projevila. U té mojí aplikace je to jedno, tam se vykreslí pár grafů a pak to uživatel zavře, takže to žádný problém nezpůsobí. Ale co kdyby to bylo něco jako webový prohlížeč nebo desktopové prostředí? To běží týdny nebo měsíce a uživatel tam pořád něco otvírá a zavírá -- tam by se ty úniky paměti nastřádaly a problém by to byl. Tohle přece musí být nějak vyřešené, ne? <javaTrolling>Nebo je je jediným řešením garbage collector? :-)</javaTrolling>

2) Chápu, že je potřeba se to naučit číst a chápu i že ne vše je dokonalé a nějaké menší chyby nebo plané poplachy v těch knihovnách být můžou. Můj plán tedy byl, že do LSAN_OPTIONS=suppressions= přidám (zatím tam mám libdbus-1.so a libfontconfig.so) ignorování známých chyb v knihovnách, a pak mi AddressSanitizer bude hlásit už jen moje chyby. Jenže jak na to -- co tam mám přidat, když mi hlásí tohle?

$ LSAN_OPTIONS=suppressions=stackedbarchart/asan-ignore.txt build-stackedbarchart-Desktop-Ladu011bnu00ed/stackedbarchart 

=================================================================
==10398==ERROR: LeakSanitizer: detected memory leaks

Indirect leak of 6048 byte(s) in 84 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717254441  (/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x2bc441)

Indirect leak of 5830 byte(s) in 29 object(s) allocated from:
    #0 0x7f871838eb50 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb50)
    #1 0x7f87170458c1 in QArrayData::allocate(unsigned long, unsigned long, unsigned long, QFlags<QArrayData::AllocationOption>) (/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0xad8c1)

Indirect leak of 2240 byte(s) in 20 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8715773581 in QBrush::init(QColor const&, Qt::BrushStyle) (/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5+0x2bb581)

Indirect leak of 2128 byte(s) in 2 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8715690ed3 in QFontDatabase::load(QFontPrivate const*, int) (/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5+0x1d8ed3)

Indirect leak of 1944 byte(s) in 27 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f87172556f2 in QObjectPrivate::connectImpl(QObject const*, int, QObject const*, void**, QtPrivate::QSlotObjectBase*, Qt::ConnectionType, int const*, QMetaObject const*) (/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x2bd6f2)

Indirect leak of 1904 byte(s) in 17 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717258e01 in QObject::QObject(QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x2c0e01)

Indirect leak of 576 byte(s) in 8 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8715868976 in QPen::QPen(QColor const&) (/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5+0x3b0976)
    #2 0x29183d753b2edeff  (<unknown module>)

Indirect leak of 512 byte(s) in 8 object(s) allocated from:
    #0 0x7f871838ef40 in realloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdef40)
    #1 0x7f87170962e0 in QListData::realloc_grow(int) (/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0xfe2e0)

Indirect leak of 512 byte(s) in 16 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717253961 in QObjectPrivate::addConnection(int, QObjectPrivate::Connection*) (/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x2bb961)

Indirect leak of 480 byte(s) in 30 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffeafe  (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xceafe)

Indirect leak of 272 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717fcaa03 in QtCharts::QBarCategoryAxis::QBarCategoryAxis(QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0x9aa03)

Indirect leak of 264 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717fc7f83 in QtCharts::QValueAxis::QValueAxis(QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0x97f83)

Indirect leak of 192 byte(s) in 2 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8715667435 in QFont::detach() (/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5+0x1af435)

Indirect leak of 160 byte(s) in 5 object(s) allocated from:
    #0 0x7f871838eb50 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb50)
    #1 0x7f8717096131 in QListData::detach_grow(int*, int) (/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0xfe131)

Indirect leak of 160 byte(s) in 5 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffa871  (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xca871)

Indirect leak of 160 byte(s) in 5 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffa7e5  (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xca7e5)

Indirect leak of 160 byte(s) in 5 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffa74b  (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xca74b)

Indirect leak of 160 byte(s) in 5 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffa6a3  (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xca6a3)
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 152 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8718002953 in QtCharts::QStackedBarSeries::QStackedBarSeries(QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xd2953)
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 112 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717f91bc1  (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0x61bc1)
    #2 0x60300004e2df  (<unknown module>)

Indirect leak of 96 byte(s) in 3 object(s) allocated from:
    #0 0x7f871838eb50 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb50)
    #1 0x7f87170961eb in QListData::detach(int) (/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0xfe1eb)

Indirect leak of 96 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f87156652e5 in QFont::QFont(QString const&, int, int, bool) (/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5+0x1ad2e5)

Indirect leak of 88 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffdc3d in QtCharts::QBarSet::QBarSet(QString, QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xcdc3d)
    #2 0xeae59bd6  (<unknown module>)

Indirect leak of 88 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffdc3d in QtCharts::QBarSet::QBarSet(QString, QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xcdc3d)

Indirect leak of 88 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffdc3d in QtCharts::QBarSet::QBarSet(QString, QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xcdc3d)
    #2 0x7fff1428e1cf  (<unknown module>)

Indirect leak of 88 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffdc3d in QtCharts::QBarSet::QBarSet(QString, QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xcdc3d)
    #2 0x7f871946d147  (<unknown module>)

Indirect leak of 88 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717ffdc3d in QtCharts::QBarSet::QBarSet(QString, QObject*) (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0xcdc3d)
    #2 0x7f87182db72e  (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x2b72e)

Indirect leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x55dbc98ba845 in main ../stackedbarchart/main.cpp:59
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x55dbc98b9ab4 in main ../stackedbarchart/main.cpp:49
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x7f8717f92fe6  (/usr/lib/x86_64-linux-gnu/libQt5Charts.so.5+0x62fe6)

Indirect leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x55dbc98b9a31 in main ../stackedbarchart/main.cpp:48
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x55dbc98b99ae in main ../stackedbarchart/main.cpp:47
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x55dbc98bacf3 in main ../stackedbarchart/main.cpp:77
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x55dbc98b992b in main ../stackedbarchart/main.cpp:46
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Indirect leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x55dbc98b98a8 in main ../stackedbarchart/main.cpp:45
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

-----------------------------------------------------
Suppressions used:
  count      bytes template
     78      13390 /lib/x86_64-linux-gnu/libdbus-1.so
    127       8807 /usr/lib/x86_64-linux-gnu/libfontconfig.so
-----------------------------------------------------

SUMMARY: AddressSanitizer: 24790 byte(s) leaked in 289 allocation(s).

Čeho se tam můžu chytnout, když tam jsou řádky jako tyhle?

    #0 0x7f8718390458 in operator new(unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0458)
    #1 0x55dbc98b98a8 in main ../stackedbarchart/main.cpp:45
    #2 0x7f8716619b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

Jde mi o to, abych toho neignoroval moc a nezakrylo to moje vlastní chyby. Když tam přidám primitivní chybu:

char* chyba = new char[666];
return returnCode;

Tak to způsobí hlášku o přímém úniku:

Direct leak of 666 byte(s) in 1 object(s) allocated from:
    #0 0x7fd512c20618 in operator new[](unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0618)
    #1 0x558aed43af84 in main ../stackedbarchart/main.cpp:116
    #2 0x7fd510ea9b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)

To tedy chceš říct, že mám ignorovat všechny nepřímé úniky? Nehrozí (alespoň v Qt), že bych takový nepřímý únik způsobil chybou ve svém kódu?