[Bug 273031] textproc/kdiff3: Bus error in xcb_send_request_with_fds64 at termination

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273031

            Bug ID: 273031
           Summary: textproc/kdiff3: Bus error in
                    xcb_send_request_with_fds64 at termination
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: kde at FreeBSD.org
          Reporter: emaste at freebsd.org
          Assignee: kde at FreeBSD.org
             Flags: maintainer-feedback?(kde at FreeBSD.org)

Reproduction:
$ echo x > a.file
$ kdiff3 -o /dev/null a.file a.file a.file
<choose [B], save file>
Bus error (core dumped)

(lldb) bt
* thread #1, name = 'kdiff3', stop reason = signal SIGBUS
  * frame #0: 0x000000083c4b7763 libxcb.so.1`xcb_send_request_with_fds64 + 35
    frame #1: 0x000000086233f4e6 libxcb-shm.so.0`xcb_shm_detach_checked + 70
    frame #2: 0x000000086085bb1d libQt5XcbQpa.so.5`___lldb_unnamed_symbol3365 +
45
    frame #3: 0x000000086085ba44 libQt5XcbQpa.so.5`___lldb_unnamed_symbol3364 +
68
    frame #4: 0x000000086085ed03 libQt5XcbQpa.so.5`___lldb_unnamed_symbol3399 +
19
    frame #5: 0x000000086085dab9 libQt5XcbQpa.so.5`___lldb_unnamed_symbol3378 +
41
    frame #6: 0x000000086085db4e libQt5XcbQpa.so.5`___lldb_unnamed_symbol3379 +
14
    frame #7: 0x000000083383723c libQt5Gui.so.5`QBackingStore::~QBackingStore()
+ 28
    frame #8: 0x0000000835ec654a
libQt5Widgets.so.5`QWidgetPrivate::deleteTLSysExtra() + 106
    frame #9: 0x0000000835ec62fd libQt5Widgets.so.5`QWidget::destroy(bool,
bool) + 1005
    frame #10: 0x0000000835ec5a35 libQt5Widgets.so.5`QWidget::~QWidget() + 1189
    frame #11: 0x0000000000326b71 kdiff3`___lldb_unnamed_symbol4236 + 49
    frame #12: 0x0000000838174a3b
libc.so.7`__cxa_finalize(dso=0x0000000000000000) at atexit.c:238:5
    frame #13: 0x0000000838174fd1 libc.so.7`exit(status=0) at exit.c:74:2
    frame #14: 0x000000083808d11d libc.so.7`__libc_start1(argc=6,
argv=0x000000082057d658, env=0x000000082057d690, cleanup=<unavailable>,
mainX=(kdiff3`___lldb_unnamed_symbol2673)) at libc_start1.c:157:2
    frame #15: 0x000000000027b3a0 kdiff3`___lldb_unnamed_symbol2452 + 48

Sorry I don't have more to go on just yet, will add additional detail if/when I
can obtain more.

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