https://bugs.kde.org/show_bug.cgi?id=400499
--- Comment #17 from Matt Fagnani <matthew.fagn...@utoronto.ca> --- Created attachment 117348 --> https://bugs.kde.org/attachment.cgi?id=117348&action=edit New crash information added by DrKonqi ksysguard (5.14.4) using Qt 5.11.3 - What I was doing when the application crashed: I closed ksysguard, and drkonqi appeared. This crash occurred with qt 5.11.3, ksysguard 5.14.4, kf5 5.53 in Fedora 29. The use-after-free errors found by valgrind which I previously reported occurred each time I closed ksysguard. I wrote a patch removing delete KSGRD::SensorMgr; in the kdemain function at ksysguard.cpp:611 after the app finishes. When I applied the patch, only the first invalid read use-after-free at SensorAgent.cpp:186 was shown by valgrind. The crashes might be prevented because the use-after-free errors didn't continue to the point where the segmentation fault occurred at qstring.cpp:3153. The crash I'm reporting here is from the Fedora ksysguard-5.14.4-1.fc29 package without the patch I wrote. If anyone has ideas on how to prevent the first use-after-free error at SensorAgent.cpp:186 or otherwise fix the crashes, please let me know. -- Backtrace (Reduced): #8 0xb5cf5a22 in operator==(QString const&, QString const&) (s1=..., s2=...) at tools/qstring.cpp:3153 #9 0xb68e6edf in QLabel::setText(QString const&) (this=0xd05260, text=...) at widgets/qlabel.cpp:287 #10 0xb7f4749c in TopLevel::answerReceived(int, QList<QByteArray> const&) (this=0xc71a80, id=1, answerList=...) at /usr/src/debug/ksysguard-5.14.4-1.fc29.i386/gui/ksysguard.cpp:450 #11 0xb759f925 in KSGRD::SensorAgent::processAnswer(char const*, int) (this=0xc86f20, buf=0xea0420 "100.000000\nksysguardd> 327360\nksysguardd> 111360\nksysguardd> 0\nksysguardd> 0\nksysguardd> /dev/mapper/fedora-root\t30832636\t26958848\t2284540\t93\t/\n/dev/mapper/fedora-home\t84853216\t80074544\t974528\t99\t/hom"..., buflen=583) at /usr/src/debug/libksysguard-5.14.4-1.fc29.i386/ksgrd/SensorAgent.cpp:91 #12 0xb75a6e8e in KSGRD::SensorShellAgent::msgRcvd() (this=0xc86f20) at /usr/include/qt5/QtCore/qarraydata.h:206 -- You are receiving this mail because: You are watching all bug changes.
