Segfault when resetting the terminal after displaying an image (bug)

[sergei-grechanik]

Ghostty sometimes crashes with a segmentation fault when the terminal is reset after displaying an image. To reproduce, run the following script sh ghostty_bug_placement_movecursor_direct.sh.txt:
ghostty_bug_placement_movecursor_direct.sh.txt

(Ubuntu 24.04, commit a8e5eef)

It crashes both in release and debug mode. Debug mode logs:
ghostty-image-then-reset-crash-log.txt

[cogwheel]

I experienced the same issue. 100% reproducible on hyprland

kitten icat /usr/share/hypr/wall1.png
reset

here is the end of the ghostty output (run from another terminal):

EGL API version 1.5 found
 - Vendor: Mesa Project
 - Version: 1.5
 - Device: /dev/dri/renderD128, 226 128
 - Client APIs: OpenGL OpenGL_ES
 - Extensions:
        EGL_ANDROID_blob_cache
        EGL_ANDROID_native_fence_sync
        EGL_EXT_buffer_age
        EGL_EXT_config_select_group
        EGL_EXT_create_context_robustness
        EGL_EXT_image_dma_buf_import
        EGL_EXT_image_dma_buf_import_modifiers
        EGL_EXT_pixel_format_float
        EGL_EXT_present_opaque
        EGL_EXT_query_reset_notification_strategy
        EGL_EXT_surface_compression
        EGL_EXT_swap_buffers_with_damage
        EGL_IMG_context_priority
        EGL_KHR_cl_event2
        EGL_KHR_config_attribs
        EGL_KHR_context_flush_control
        EGL_KHR_create_context
        EGL_KHR_create_context_no_error
        EGL_KHR_fence_sync
        EGL_KHR_get_all_proc_addresses
        EGL_KHR_gl_colorspace
        EGL_KHR_gl_renderbuffer_image
        EGL_KHR_gl_texture_2D_image
        EGL_KHR_gl_texture_3D_image
        EGL_KHR_gl_texture_cubemap_image
        EGL_KHR_image_base
        EGL_KHR_no_config_context
        EGL_KHR_reusable_sync
        EGL_KHR_surfaceless_context
        EGL_KHR_swap_buffers_with_damage
        EGL_KHR_wait_sync
        EGL_MESA_configless_context
        EGL_MESA_drm_image
        EGL_MESA_gl_interop
        EGL_MESA_image_dma_buf_export
        EGL_MESA_query_driver
        EGL_MESA_x11_native_visual_id
        EGL_WL_bind_wayland_display
        EGL_WL_create_wayland_buffer_from_image
 - Selected fbconfig: R8G8B8A8, depth 0, stencil 0
          high depth: R16G16B16A16 float, depth 0, stencil 0
Creating EGL context version 3.2 (debug:no, forward:no, legacy:no, es:no)
Using OpenGL backend EGL
Creating EGL context version 3.2 (debug:no, forward:no, legacy:no, es:no)
OpenGL version: 4.6 (core)
GLSL version: 4.60
Max texture size: 16384
Enabled features (use GDK_GL_DISABLE env var to disable):
    debug: ✓
    unpack-subimage: ✓
    half-float: ✓
    sync: ✓
    base-instance: ✓
    buffer-storage: ✓
OpenGL version: 4.6 (core)
GLSL version: 4.60
Max texture size: 16384
Enabled features (use GDK_GL_DISABLE env var to disable):
    debug: ✓
    unpack-subimage: ✓
    half-float: ✓
    sync: ✓
    base-instance: ✓
    buffer-storage: ✓
Creating EGL context version 3.3 (debug:no, forward:no, legacy:no, es:no)
OpenGL version: 4.6 (core)
GLSL version: 4.60
Max texture size: 16384
Enabled features (use GDK_GL_DISABLE env var to disable):
    debug: ✓
    unpack-subimage: ✓
    half-float: ✓
    sync: ✓
    base-instance: ✓
    buffer-storage: ✓
info(grid): loaded OpenGL 4.6
info(io_exec): found Ghostty resources dir: /usr/share/ghostty
info(io_exec): shell integration automatically injected shell=termio.shell_integration.Shell.zsh
warning(gtk): unimplemented action=apprt.action.Action.Key.cell_size
warning(gtk): unimplemented action=apprt.action.Action.Key.size_limit
info(io_exec): started subcommand path=/bin/sh pid=3479
info(io_exec): subcommand cgroup=-
Creating EGL context version 3.2 (debug:no, forward:no, legacy:no, es:no)
OpenGL version: 4.6 (core)
GLSL version: 4.60
Max texture size: 16384
Enabled features (use GDK_GL_DISABLE env var to disable):
    debug: ✓
    unpack-subimage: ✓
    half-float: ✓
    sync: ✓
    base-instance: ✓
    buffer-storage: ✓
Using fractional scale 1 for EGL window (1000 600 => 1000 600)
Using fractional scale 1 for EGL window (947 1029 => 947 1029)
info(grid): reallocating GPU buffer old=0 new=8
info(grid): reallocating GPU buffer old=8 new=20
info(grid): reallocating GPU buffer old=20 new=65
warning(stream): unimplemented CSI action: ESC [ * {  } x
warning(stream): unimplemented OSC callback: terminal.osc.Command{ .end_of_command = terminal.osc.Command.Command__struct_95667{ .exit_code = 0 } }
warning(stream): unimplemented OSC command: end_of_command
warning(stream): unimplemented OSC callback: terminal.osc.Command{ .end_of_command = terminal.osc.Command.Command__struct_95667{ .exit_code = 0 } }
warning(stream): unimplemented OSC command: end_of_command
warning(stream): unimplemented CSI action: ESC [ * {  } x
warning(stream): unimplemented OSC callback: terminal.osc.Command{ .end_of_command = terminal.osc.Command.Command__struct_95667{ .exit_code = 0 } }
warning(stream): unimplemented OSC command: end_of_command
warning(osc): invalid OSC command:
zsh: segmentation fault (core dumped)  ghostty

[00-kat]

Can't reproduce this with /usr/share/hypr/wall1.png, though I can with the script OP sent.

[pluiedev]

Got it to crash on a debug build — converting into an issue now. Interestingly it seemed to be able to display the image itself just fine, but it crashed shortly after... (I see that's because there's a pause in the script :p The crash is triggered by the reset CSI)

[00-kat]

Moved to #5649.

(I assume you forgot to link it back here.)