[Wayland-bugs] [Bug 94075] SIGSEGV in xkb_context_ref from /usr/lib/libxkbcommon.so.0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94075

--- Comment #7 from Robert Folland <robert.folland at me.com> ---
And here is output from valgrind. I could not get it to crash with valgrind
with a debug version of libxkbcommon. Only with sdl2 and wayland debug
versions.

 Init 41
==446== Invalid read of size 4
==446==    at 0x6FE9CD3: xkb_context_ref (in /usr/lib/libxkbcommon.so.0.0.0)
==446==    by 0x6FEBEB8: ??? (in /usr/lib/libxkbcommon.so.0.0.0)
==446==    by 0x6FEB7FB: xkb_keymap_new_from_buffer (in
/usr/lib/libxkbcommon.so.0.0.0)
==446==    by 0x4EF7A4D: keyboard_handle_keymap (SDL_waylandevents.c:269)
==446==    by 0x69C21EF: ffi_call_unix64 (in /usr/lib/libffi.so.6.0.4)
==446==    by 0x69C1C57: ffi_call (in /usr/lib/libffi.so.6.0.4)
==446==    by 0x67B5E3D: wl_closure_invoke (connection.c:949)
==446==    by 0x67B2BDF: dispatch_event.isra.4 (wayland-client.c:1274)
==446==    by 0x67B3DB3: dispatch_queue (wayland-client.c:1420)
==446==    by 0x67B3DB3: wl_display_dispatch_queue_pending
(wayland-client.c:1662)
==446==    by 0x67B40CE: wl_display_roundtrip_queue (wayland-client.c:1085)
==446==    by 0x4EF8A9F: Wayland_VideoInit (SDL_waylandvideo.c:302)
==446==    by 0x4EE3ED5: SDL_VideoInit_REAL (SDL_video.c:513)
==446==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==446== 
==446== 
==446== Process terminating with default action of signal 11 (SIGSEGV): dumping
core
==446==  Access not within mapped region at address 0x0
==446==    at 0x6FE9CD3: xkb_context_ref (in /usr/lib/libxkbcommon.so.0.0.0)
==446==    by 0x6FEBEB8: ??? (in /usr/lib/libxkbcommon.so.0.0.0)
==446==    by 0x6FEB7FB: xkb_keymap_new_from_buffer (in
/usr/lib/libxkbcommon.so.0.0.0)
==446==    by 0x4EF7A4D: keyboard_handle_keymap (SDL_waylandevents.c:269)
==446==    by 0x69C21EF: ffi_call_unix64 (in /usr/lib/libffi.so.6.0.4)
==446==    by 0x69C1C57: ffi_call (in /usr/lib/libffi.so.6.0.4)
==446==    by 0x67B5E3D: wl_closure_invoke (connection.c:949)
==446==    by 0x67B2BDF: dispatch_event.isra.4 (wayland-client.c:1274)
==446==    by 0x67B3DB3: dispatch_queue (wayland-client.c:1420)
==446==    by 0x67B3DB3: wl_display_dispatch_queue_pending
(wayland-client.c:1662)
==446==    by 0x67B40CE: wl_display_roundtrip_queue (wayland-client.c:1085)
==446==    by 0x4EF8A9F: Wayland_VideoInit (SDL_waylandvideo.c:302)
==446==    by 0x4EE3ED5: SDL_VideoInit_REAL (SDL_video.c:513)
==446==  If you believe this happened as a result of a stack
==446==  overflow in your program's main thread (unlikely but
==446==  possible), you can try to increase the size of the
==446==  main thread stack using the --main-stacksize= flag.
==446==  The main thread stack size used in this run was 8388608.
==446== 
==446== HEAP SUMMARY:
==446==     in use at exit: 104,282 bytes in 103 blocks
==446==   total heap usage: 66,126 allocs, 66,023 frees, 8,770,031 bytes
allocated
==446== 
==446== 1,424 bytes in 1 blocks are definitely lost in loss record 38 of 42
==446==    at 0x4C2C947: calloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==446==    by 0x6FEBE9D: ??? (in /usr/lib/libxkbcommon.so.0.0.0)
==446==    by 0x6FEB7FB: xkb_keymap_new_from_buffer (in
/usr/lib/libxkbcommon.so.0.0.0)
==446==    by 0x4EF7A4D: keyboard_handle_keymap (SDL_waylandevents.c:269)
==446==    by 0x69C21EF: ffi_call_unix64 (in /usr/lib/libffi.so.6.0.4)
==446==    by 0x69C1C57: ffi_call (in /usr/lib/libffi.so.6.0.4)
==446==    by 0x67B5E3D: wl_closure_invoke (connection.c:949)
==446==    by 0x67B2BDF: dispatch_event.isra.4 (wayland-client.c:1274)
==446==    by 0x67B3DB3: dispatch_queue (wayland-client.c:1420)
==446==    by 0x67B3DB3: wl_display_dispatch_queue_pending
(wayland-client.c:1662)
==446==    by 0x67B40CE: wl_display_roundtrip_queue (wayland-client.c:1085)
==446==    by 0x4EF8A9F: Wayland_VideoInit (SDL_waylandvideo.c:302)
==446==    by 0x4EE3ED5: SDL_VideoInit_REAL (SDL_video.c:513)
==446== 
==446== LEAK SUMMARY:
==446==    definitely lost: 1,424 bytes in 1 blocks
==446==    indirectly lost: 0 bytes in 0 blocks
==446==      possibly lost: 0 bytes in 0 blocks
==446==    still reachable: 102,858 bytes in 102 blocks
==446==         suppressed: 0 bytes in 0 blocks
==446== Reachable blocks (those to which a pointer was found) are not shown.
==446== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==446== 
==446== For counts of detected and suppressed errors, rerun with: -v
==446== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)

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