[Pkg-kde-extras] Bug#1104413: "me too" with backtrace
Anders Andersson
pipatron at gmail.com
Sun Mar 29 15:14:18 BST 2026
Since it was flagged as "unreproducible" I wanted to chime in that
this happens for me too.
Debian 13.4, GNOME 48, Wayland, . Just installed labplot and it didn't
start so I did some debugging without reaching any conclusions.
Starting from a terminal shows a splash window a fraction of a second
(faster than it's possible to see) and is then terminated:
❯ labplot
fish: Job 1, 'labplot' terminated by signal SIGSEGV (Address boundary error)
QT_QPA_PLATFORM=xcb does not make a difference.
Running in gdb shows that it's crashing after the splash screen and
another black window: https://i.imgur.com/pnLUjH7.jpeg
The backtrace doesn't look useful:
(gdb) run
Starting program: /usr/bin/labplot
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffea6da6c0 (LWP 80908)]
[New Thread 0x7fffe9ed96c0 (LWP 80909)]
[New Thread 0x7fffe3fff6c0 (LWP 80910)]
[New Thread 0x7fffe37fe6c0 (LWP 80911)]
[New Thread 0x7fffe2ffd6c0 (LWP 80912)]
[New Thread 0x7fffe27fc6c0 (LWP 80914)]
Thread 1 "labplot" received signal SIGSEGV, Segmentation fault.
0x00005555557e8304 in ?? ()
(gdb) bt full
#0 0x00005555557e8304 in ??? ()
#1 0x00005555557e8c70 in ??? ()
#2 0x000055555579389e in ??? ()
#3 0x00007ffff3a35ca8 in __libc_start_call_main
(main=main at entry=0x555555791f10, argc=argc at entry=1,
argv=argv at entry=0x7fffffffe308)
at ../sysdeps/nptl/libc_start_call_main.h:58
self = <optimized out>
result = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737488347912,
5020425957166467729, 0, 140737488347928, 140737354125312,
93825007010456, -5020425958104184175, -5020451964185687407},
mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7fffffffe308, 0x1},
data = {prev = 0x0, cleanup = 0x0, canceltype = -7416}}}
not_first_call = <optimized out>
#4 0x00007ffff3a35d65 in __libc_start_main_impl
(main=0x555555791f10, argc=1, argv=0x7fffffffe308, init=<optimized
out>, fini=<optimized out>, rtld_fini=<optimized out>,
stack_end=0x7fffffffe2f8) at ../csu/libc-start.c:360
#5 0x00005555557bb121 in ??? ()
I also ran it in valgrind, I don't know which flags to use but at
least there's something:
❯ valgrind labplot
==81335== Memcheck, a memory error detector
==81335== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==81335== Using Valgrind-3.24.0 and LibVEX; rerun with -h for copyright info
==81335== Command: labplot
==81335==
==81335== Syscall param writev(vector[0]) points to uninitialised byte(s)
==81335== at 0x85DD9EE: __syscall_cancel_arch (syscall_cancel.S:56)
==81335== by 0x85D2667: __internal_syscall_cancel (cancellation.c:49)
==81335== by 0x85D26AC: __syscall_cancel (cancellation.c:75)
==81335== by 0x86534E8: writev (writev.c:26)
==81335== by 0x4F5C015: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==81335== by 0x4F5C8B0: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==81335== by 0x4F5DBC4: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==81335== by 0x4F5DC44: xcb_wait_for_reply (in
/usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==81335== by 0x1242FB99:
QXcbConnection::initializeScreensFromMonitor(xcb_screen_iterator_t*,
int, QXcbScreen**, bool) (in
/usr/lib/x86_64-linux-gnu/libQt6XcbQpa.so.6.8.2)
==81335== by 0x124317C7: QXcbConnection::initializeScreens(bool)
(in /usr/lib/x86_64-linux-gnu/libQt6XcbQpa.so.6.8.2)
==81335== by 0x12421D50:
QXcbConnection::QXcbConnection(QXcbNativeInterface*, bool, unsigned
int, char const*) (in /usr/lib/x86_64-linux-gnu/libQt6XcbQpa.so.6.8.2)
==81335== by 0x12447135:
QXcbIntegration::QXcbIntegration(QList<QString> const&, int&, char**)
(in /usr/lib/x86_64-linux-gnu/libQt6XcbQpa.so.6.8.2)
==81335== Address 0x11db7d15 is 4,533 bytes inside a block of size
21,176 alloc'd
==81335== at 0x484BBA3: calloc (vg_replace_malloc.c:1675)
==81335== by 0x4F5B9C2: xcb_connect_to_fd (in
/usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==81335== by 0x4F60240: xcb_connect_to_display_with_auth_info (in
/usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
==81335== by 0x98070C1: _XConnectXCB (in
/usr/lib/x86_64-linux-gnu/libX11.so.6.4.0)
==81335== by 0x97F6B44: XOpenDisplay (in
/usr/lib/x86_64-linux-gnu/libX11.so.6.4.0)
==81335== by 0x1242AF26:
QXcbBasicConnection::QXcbBasicConnection(char const*) (in
/usr/lib/x86_64-linux-gnu/libQt6XcbQpa.so.6.8.2)
==81335== by 0x12421B02:
QXcbConnection::QXcbConnection(QXcbNativeInterface*, bool, unsigned
int, char const*) (in /usr/lib/x86_64-linux-gnu/libQt6XcbQpa.so.6.8.2)
==81335== by 0x12447135:
QXcbIntegration::QXcbIntegration(QList<QString> const&, int&, char**)
(in /usr/lib/x86_64-linux-gnu/libQt6XcbQpa.so.6.8.2)
==81335== by 0x486E46F: ??? (in
/usr/lib/x86_64-linux-gnu/qt6/plugins/platforms/libqxcb.so)
==81335== by 0x70FA507:
QGuiApplicationPrivate::createPlatformIntegration() (in
/usr/lib/x86_64-linux-gnu/libQt6Gui.so.6.8.2)
==81335== by 0x70FC0A7:
QGuiApplicationPrivate::createEventDispatcher() (in
/usr/lib/x86_64-linux-gnu/libQt6Gui.so.6.8.2)
==81335== by 0x78EEC55: QCoreApplicationPrivate::init() (in
/usr/lib/x86_64-linux-gnu/libQt6Core.so.6.8.2)
==81335==
==81335== Invalid read of size 8
==81335== at 0x39C304: ??? (in /usr/bin/labplot)
==81335== by 0x39CC6F: ??? (in /usr/bin/labplot)
==81335== by 0x34789D: ??? (in /usr/bin/labplot)
==81335== by 0x856CCA7: (below main) (libc_start_call_main.h:58)
==81335== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==81335==
==81335==
==81335== Process terminating with default action of signal 11 (SIGSEGV)
==81335== Access not within mapped region at address 0x0
==81335== at 0x39C304: ??? (in /usr/bin/labplot)
==81335== by 0x39CC6F: ??? (in /usr/bin/labplot)
==81335== by 0x34789D: ??? (in /usr/bin/labplot)
==81335== by 0x856CCA7: (below main) (libc_start_call_main.h:58)
==81335== If you believe this happened as a result of a stack
==81335== overflow in your program's main thread (unlikely but
==81335== possible), you can try to increase the size of the
==81335== main thread stack using the --main-stacksize= flag.
==81335== The main thread stack size used in this run was 8388608.
==81335==
==81335== HEAP SUMMARY:
==81335== in use at exit: 5,582,866 bytes in 57,547 blocks
==81335== total heap usage: 274,576 allocs, 217,029 frees,
31,990,582 bytes allocated
==81335==
==81335== LEAK SUMMARY:
==81335== definitely lost: 5,888 bytes in 20 blocks
==81335== indirectly lost: 10,748 bytes in 459 blocks
==81335== possibly lost: 47,667 bytes in 300 blocks
==81335== still reachable: 5,330,003 bytes in 55,142 blocks
==81335== of which reachable via heuristic:
==81335== newarray : 31,288 bytes in
203 blocks
==81335== suppressed: 0 bytes in 0 blocks
==81335== Rerun with --leak-check=full to see details of leaked memory
==81335==
==81335== Use --track-origins=yes to see where uninitialised values come from
==81335== For lists of detected and suppressed errors, rerun with: -s
==81335== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
fish: Job 1, 'valgrind labplot' terminated by signal SIGSEGV (Address
boundary error)
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