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  1. Qt
  2. QTBUG-68451

[9;0]TouchPointPressed without previous release event QQuickEventPoint(accepted:false state:Pressed scenePos:QPointF(327.487,183.617) id:2000002 timeHeld:0) Segmentation fault

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      Description

      I have a adafruit 2.8" 320x240 capacitive touch display running on a raspberry pi. I cross compiled my executable under linux, where I also cross-compiled qt. If I run the enclosed example program, and touch the screen repeatedly, I get a segfault.

      [9;0]TouchPointPressed without previous release event QQuickEventPoint(accepted:false state:Pressed scenePos:QPointF(327.487,183.617) id:2000002 timeHeld:0)
      Segmentation fault

      Here is what gdb tells me

      Program received signal SIGABRT, Aborted.
      [Switching to Thread 0x72e90440 (LWP 1317)]
      0x75aebf70 in __GI_raise (sig=sig@entry=6)
      at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
      56 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
      (gdb) where
      #0 0x75aebf70 in __GI_raise (sig=sig@entry=6)
      at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
      #1 0x75aed324 in __GI_abort () at abort.c:89
      #2 0x75b27954 in __libc_message (do_abort=<optimized out>,
      fmt=0x75bdd6e8 "*** Error in `%s': %s: 0x%s ***\n")
      at ../sysdeps/posix/libc_fatal.c:175
      #3 0x75b2db80 in malloc_printerr (action=1,
      str=0x75bdd924 "double free or corruption (fasttop)", ptr=<optimized out>)
      at malloc.c:4996
      #4 0x75b2eb24 in _int_free (av=<optimized out>, p=<optimized out>,
      have_lock=-1) at malloc.c:3840
      #5 0x75e82a98 in QMapDataBase::freeTree(QMapNodeBase*, int) ()
      from /usr/local/qt5pi/lib/libQt5Core.so.5
      #6 0x76830204 in QWindowSystemInterfacePrivate::fromNativeTouchPoints(QList<QWindowSystemInterface::TouchPoint> const&, QWindow const*, unsigned char, QEvent::Type*) () from /usr/local/qt5pi/lib/libQt5Gui.so.5
      #7 0x71d0aaf0 in ?? ()

        Attachments

        1. main.cpp
          0.4 kB
        2. main.qml
          0.4 kB

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              Assignee:
              srutledg Shawn Rutledge
              Reporter:
              maxwell31 James Maxwell
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                Updated:
                Resolved:

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