SIGSEGV when switching to the Tek mode

[Andrej Shadura]

When I press both mouse buttons while holding Ctrl and select Switch to Tek mode, xterm crashes.

$ gdb xterm
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Reading symbols from xterm...Reading symbols from /usr/lib/debug/.build-id/70/b22a67217f6f04a00907a97327b50fff07aeec.debug...done.
done.
(gdb) run
Starting program: /usr/bin/xterm
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Detaching after fork from child process 13992]
[Detaching after fork from child process 13993]

Program received signal SIGSEGV, Segmentation fault.
TekSetWinSize (tw=0x0) at ../Tekproc.c:918
918 ../Tekproc.c: No such file or directory.
(gdb) bt full
#0 TekSetWinSize (tw=0x0) at ../Tekproc.c:918
No locals.
#1 0x00005555555aa1b0 in end_vt_mode () at ../misc.c:5705
        xw = 0x55555583afc0
#2 0x00007ffff745432e in XtCallCallbacks (widget=0x555555891b00, name=0x5555557edb08 <XtStrings+136> "callback", call_data=0x0) at ../../src/Callback.c:568
        callbacks = <optimized out>
        icl = 0x555555891c10
        cl = 0x555555891c18
        i = <optimized out>
        ostate = <optimized out>
        app = 0x5555558073c0
#3 0x00007ffff7488a0d in HandleActions (w=w@entry=0x555555845800, event=0x7fffffffd6e0, accelWidget=<optimized out>, procs=0x5555558921c8,
    actions=0x5555558381a0, actions@entry=0x555555837cf0, stateTree=<optimized out>) at ../../src/TMstate.c:644
        actionHookList = 0x0
        bindWidget = <optimized out>
        hook = <optimized out>
        next_hook = <optimized out>
        procName = <optimized out>
#4 0x00007ffff7488e75 in HandleSimpleState (w=w@entry=0x555555845800, tmRecPtr=tmRecPtr@entry=0x555555845848, curEventPtr=curEventPtr@entry=0x7fffffffd340)
    at ../../src/TMstate.c:883
        bindData = <optimized out>
        procs = <optimized out>
        accelWidget = <optimized out>
        xlations = 0x5555558382c0
        stateTree = <optimized out>
        contextPtr = 0x555555845858
        i = 1
        actions = 0x555555837cf0
        matchExact = 1 '\001'
        match = <optimized out>
        complexMatchState = 0x0
        currIndex = -2
        typeIndex = 3
        modIndex = 0
        matchTreeIndex = <optimized out>
#5 0x00007ffff7489b3d in _XtTranslateEvent (w=w@entry=0x555555845800, event=event@entry=0x7fffffffd6e0) at ../../src/TMstate.c:1101
        tmRecPtr = 0x555555845848
        curEvent = {xev = 0x7fffffffd6e0, event = {modifiers = 516, modifierMask = 0, lateModifiers = 0x0, eventType = 5, eventCode = 2, eventCodeMask = 0,
            matchEvent = 0x0, standard = 0 '\000'}}
        current_state = <optimized out>
#6 0x00007ffff7461e52 in XtDispatchEventToWidget (widget=widget@entry=0x555555845800, event=event@entry=0x7fffffffd6e0) at ../../src/Event.c:906
--Type <RET> for more, q to quit, c to continue without paging--
        p = <optimized out>
        was_dispatched = 0 '\000'
        call_tm = <optimized out>
        cont_to_disp = 1 '\001'
        mask = <optimized out>
        app = <optimized out>
#7 0x00007ffff746283d in _XtDefaultDispatcher (event=0x7fffffffd6e0) at ../../src/Event.c:1367
        mask = 8
        dspWidget = 0x555555845800
        was_filtered = <optimized out>
        widget = 0x555555845800
        grabType = remap
        pdi = 0x555555815370
        grabList = 0x555555892240
        was_dispatched = 0 '\000'
        app = <optimized out>
#8 0x00007ffff7462919 in XtDispatchEvent (event=event@entry=0x7fffffffd6e0) at ../../src/Event.c:1423
        was_dispatched = <optimized out>
        safe = <optimized out>
        dispatch_level = 1
        starting_count = 0
        pd = <optimized out>
        time = <optimized out>
        dispatch = <optimized out>
        app = 0x5555558073c0
#9 0x00005555555a8bbc in xevents () at ../misc.c:680
        xw = 0x55555583afc0
        screen = 0x55555583b148
        event = {type = 5, xany = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544}, xkey = {type = 5, serial = 719,
            send_event = 0, display = 0x5555558086b0, window = 171966544, root = 348, subwindow = 0, time = 158476707, x = 146, y = 401, x_root = 425,
            y_root = 691, state = 516, keycode = 2, same_screen = 1}, xbutton = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0,
            window = 171966544, root = 348, subwindow = 0, time = 158476707, x = 146, y = 401, x_root = 425, y_root = 691, state = 516, button = 2,
            same_screen = 1}, xmotion = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544, root = 348, subwindow = 0,
            time = 158476707, x = 146, y = 401, x_root = 425, y_root = 691, state = 516, is_hint = 2 '\002', same_screen = 1}, xcrossing = {type = 5,
            serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544, root = 348, subwindow = 0, time = 158476707, x = 146, y = 401,
            x_root = 425, y_root = 691, mode = 516, detail = 2, same_screen = 1, focus = 0, state = 516}, xfocus = {type = 5, serial = 719, send_event = 0,
            display = 0x5555558086b0, window = 171966544, mode = 348, detail = 0}, xexpose = {type = 5, serial = 719, send_event = 0,
            display = 0x5555558086b0, window = 171966544, x = 348, y = 0, width = 0, height = 0, count = 158476707}, xgraphicsexpose = {type = 5,
            serial = 719, send_event = 0, display = 0x5555558086b0, drawable = 171966544, x = 348, y = 0, width = 0, height = 0, count = 158476707,
            major_code = 0, minor_code = 146}, xnoexpose = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, drawable = 171966544,
            major_code = 348, minor_code = 0}, xvisibility = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544,
--Type <RET> for more, q to quit, c to continue without paging--
            state = 348}, xcreatewindow = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, parent = 171966544, window = 348, x = 0, y = 0,
            width = 158476707, height = 0, border_width = 146, override_redirect = 401}, xdestroywindow = {type = 5, serial = 719, send_event = 0,
            display = 0x5555558086b0, event = 171966544, window = 348}, xunmap = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0,
            event = 171966544, window = 348, from_configure = 0}, xmap = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, event = 171966544,
            window = 348, override_redirect = 0}, xmaprequest = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, parent = 171966544,
            window = 348}, xreparent = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, event = 171966544, window = 348, parent = 0,
            x = 158476707, y = 0, override_redirect = 146}, xconfigure = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, event = 171966544,
            window = 348, x = 0, y = 0, width = 158476707, height = 0, border_width = 146, above = 2967822401961, override_redirect = 516}, xgravity = {
            type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, event = 171966544, window = 348, x = 0, y = 0}, xresizerequest = {type = 5,
            serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544, width = 348, height = 0}, xconfigurerequest = {type = 5, serial = 719,
            send_event = 0, display = 0x5555558086b0, parent = 171966544, window = 348, x = 0, y = 0, width = 158476707, height = 0, border_width = 146,
            above = 2967822401961, detail = 516, value_mask = 1}, xcirculate = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0,
            event = 171966544, window = 348, place = 0}, xcirculaterequest = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0,
            parent = 171966544, window = 348, place = 0}, xproperty = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544,
            atom = 348, time = 0, state = 158476707}, xselectionclear = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544,
            selection = 348, time = 0}, xselectionrequest = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, owner = 171966544,
            requestor = 348, selection = 0, target = 158476707, property = 1722281885842, time = 2967822401961}, xselection = {type = 5, serial = 719,
            send_event = 0, display = 0x5555558086b0, requestor = 171966544, selection = 348, target = 0, property = 158476707, time = 1722281885842},
          xcolormap = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544, colormap = 348, new = 0, state = 0}, xclient = {
            type = 5, serial = 719, send_event = 0, display = 0x5555558086b0, window = 171966544, message_type = 348, format = 0, data = {
              b = "\243)r\t\000\000\000\000\222\000\000\000\221\001\000\000\251\001\000", s = {10659, 2418, 0, 0, 146, 0, 401, 0, 425, 0}, l = {158476707,
                1722281885842, 2967822401961, 8589935108, 1}}}, xmapping = {type = 5, serial = 719, send_event = 0, display = 0x5555558086b0,
            window = 171966544, request = 348, first_keycode = 0, count = 0}, xerror = {type = 5, display = 0x2cf, resourceid = 93823560581120,
            serial = 93824995067568, error_code = 80 'P', request_code = 0 '\000', minor_code = 64 '@'}, xkeymap = {type = 5, serial = 719, send_event = 0,
            display = 0x5555558086b0, window = 171966544,
            key_vector = "\\\001", '\000' <repeats 14 times>, "\243)r\t\000\000\000\000\222\000\000\000\221\001\000"}, xgeneric = {type = 5, serial = 719,
            send_event = 0, display = 0x5555558086b0, extension = 171966544, evtype = 0}, xcookie = {type = 5, serial = 719, send_event = 0,
            display = 0x5555558086b0, extension = 171966544, evtype = 0, cookie = 348, data = 0x0}, pad = {140733193388037, 719, 93823560581120,
            93824995067568, 171966544, 348, 0, 158476707, 1722281885842, 2967822401961, 8589935108, 1, 4398046511620, 0 <repeats 11 times>}}
        input_mask = <optimized out>
#10 0x000055555558f391 in in_put (xw=0x55555583afc0) at ../charproc.c:4912
        size = <optimized out>
        time_select = <optimized out>
        screen = 0x55555583b148
        i = <optimized out>
        update = 0
        tick = 37500
        select_mask = {fds_bits = {8, 0 <repeats 15 times>}}
        write_mask = {fds_bits = {0 <repeats 16 times>}}
        screen = <optimized out>
        i = <optimized out>
--Type <RET> for more, q to quit, c to continue without paging--
        update = <optimized out>
        select_timeout = {tv_sec = 0, tv_usec = 0}
        tick = <optimized out>
        size = <optimized out>
        time_select = <optimized out>
        __d = <optimized out>
        __d = <optimized out>
        __i__ = <optimized out>
        __d = <optimized out>
        __i__ = <optimized out>
        __d0 = <optimized out>
        __d1 = <optimized out>
        __d = <optimized out>
        __d = <optimized out>
        __d = <optimized out>
#11 doinput () at ../charproc.c:4927
        screen = 0x55555583b148
        screen = <optimized out>
#12 VTparse (xw=xw@entry=0x55555583afc0) at ../charproc.c:4451
No locals.
#13 0x000055555558f9c2 in VTRun (xw=0x55555583afc0) at ../charproc.c:7127
        screen = 0x55555583b148
#14 0x0000555555577e52 in main (argc=<optimized out>, argv=<optimized out>) at ../main.c:2782
        tblFullscreen = {{name = 0x5555555c7663 "Always", code = 2}, {name = 0x5555555c765d "Never", code = 3}}
        form_top = 0x55555582b750
        menu_top = 0x55555582b750
        menu_high = 0
        screen = <optimized out>
        mode = <optimized out>
        my_class = 0x555555804260 "XTerm"
        line_speed = 15
        winToEmbedInto = 0
(gdb) quit
A debugging session is active.

 Inferior 1 [process 13988] will be killed.

Quit anyway? (y or n) y

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xterm 330-1ubuntu3
ProcVersionSignature: Ubuntu 4.18.0-14.15-generic 4.18.20
Uname: Linux 4.18.0-14-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.10-0ubuntu13.2
Architecture: amd64
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity:Unity7:ubuntu
Date: Wed Mar 20 17:32:21 2019
DistUpgraded: Fresh install
DistroCodename: cosmic
DistroVariant: ubuntu
DkmsStatus:
 ddcci, 0.3.1, 4.18.0-12-generic, x86_64: installed
 ddcci, 0.3.1, 4.18.0-14-generic, x86_64: installed
 ddcci, 0.3.1, 4.18.0-8-generic, x86_64: installed
GraphicsCard:
 Intel Corporation HD Graphics 5500 [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo HD Graphics 5500 [17aa:2226]
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-14-generic root=/dev/mapper/ubuntu--vg-root ro net.ifnames=0 biosdevname=0 quiet splash vt.handoff=1
SourcePackage: xterm
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.vendor: LENOVO
dmi.board.asset.tag: Not Available
dmi.board.vendor: LENOVO
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.product.family: ThinkPad X250
dmi.product.version: ThinkPad X250
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+18.10.20180930-0ubuntu1
version.libdrm2: libdrm2 2.4.97-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.3.4-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.3-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.6-1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3