Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-92054

Crash on simulated touch input via uinput at xi2ProcessTouch

    XMLWordPrintable

    Details

    • Platform/s:
      Linux/X11

      Description

      SUMMARY

      Simulating touch events via uinput and rapidly removing and adding a simulated device back while sending input events crashes any Qt program (I have tested so far at least, which includes KDE programs like Konsole, KCharselect as well as Subsurface). Programs like firefox or xterm are unaffected.

      STEPS TO REPRODUCE
       

      Backtrace I got from KCharSelect via KDE's crash report dialog:

      #4  0x00007ff8f1e0a4f3 in QXcbConnection::xi2ProcessTouch(void*, QXcbWindow*) () from /usr/lib/libQt5XcbQpa.so.5
      #5  0x00007ff8f1ddb84f in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /usr/lib/libQt5XcbQpa.so.5
      #6  0x00007ff8f1ddcc69 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5XcbQpa.so.5
      #7  0x00007ff8f1e00164 in ?? () from /usr/lib/libQt5XcbQpa.so.5
      #8  0x00007ff8f4a62b84 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
      #9  0x00007ff8f4ab6c21 in ?? () from /usr/lib/libglib-2.0.so.0
      #10 0x00007ff8f4a613b1 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
      #11 0x00007ff8f6283691 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
      #12 0x00007ff8f62293ac in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
      #13 0x00007ff8f6231844 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
      #14 0x000055db93c547c5 in ?? ()
      #15 0x00007ff8f5bf0b25 in __libc_start_main () from /usr/lib/libc.so.6
      #16 0x000055db93c5488e in ?? ()
      [Inferior 1 (process 6631) detached]
      
      

      Attached is the output of `libinput debug-events` during the crash.

      I originally reported this to the KDE team, but they referred me here: https://bugs.kde.org/show_bug.cgi?id=434733

        Attachments

          Issue Links

          No reviews matched the request. Check your Options in the drop-down menu of this sections header.

            Activity

              People

              Assignee:
              srutledg Shawn Rutledge
              Reporter:
              hmh HMH
              Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

                Dates

                Created:
                Updated:

                  Gerrit Reviews

                  There are no open Gerrit changes