[bug] Core dump on KDE

[linarphy]

First, Thank you for this amazing tool \o/

I don’t know if I should post this issue here or in https://github.com/CluelessCatBurger/wl_shimeji.kwinsupport , so here I am.

I’m on Archlinux, with KDE plasma. I installed wl_shimeji and wl_shimeji.kwinsupport through AUR.
I have a core dump ~10 minutes after the first summon on a pet.

Here the output of shimeji-overlayd -se:

[11:49:09.349][INFO][src/environment.c:2336]: Binded xdg_output_manager global of ver 3
[11:49:09.349][INFO][src/environment.c:2344]: Binded wp_alpha_modifier_v1 global of ver 1
[11:49:09.349][TRACE][src/shimeji-overlay.c:200]: Starting environment interpolation thread
[11:49:09.349][TRACE][src/shimeji-overlay.c:200]: Starting environment interpolation thread
[11:49:09.349][INFO][src/environment.c:4210]: ------------[Environment 0 recalculate advertised geometry]---------------
[11:49:09.349][INFO][src/environment.c:4213]: New border mask is 0
[11:49:09.349][INFO][src/environment.c:4214]: Advertised geometry is 0, 0, 1680, 1050
[11:49:09.349][INFO][src/environment.c:4217]: Geometry alignment: 
[11:49:09.349][INFO][src/environment.c:4220]: --------------------------------------------------------------------------
[11:49:09.349][INFO][src/plugins.c:42]: [Plugins] "KWinSupport" by CluelessCatBurger (Window interaction support for KWin) of version 0.0.1 successfully initialized
[11:49:09.349][WARN][src/mascot_config_parser.c:785]: Action Divided is not defined!
[11:49:09.349][WARN][src/mascot_config_parser.c:1678]: Failed to parse action reference
[11:49:09.349][WARN][src/mascot_config_parser.c:785]: Action Divided is not defined!
[11:49:09.349][WARN][src/mascot_config_parser.c:1678]: Failed to parse action reference
[11:49:09.349][INFO][src/mascot.c:961]: <Mascot:Shimeji.Poros:0> Created new mascot of type "Poros" at (103,824)
[11:49:09.349][INFO][src/mascot.c:961]: <Mascot:Shimeji.Jinx:1> Created new mascot of type "Jinx" at (1606,824)
[11:49:09.349][INFO][src/environment.c:4210]: ------------[Environment 1 recalculate advertised geometry]---------------
[11:49:09.349][INFO][src/environment.c:4213]: New border mask is 0
[11:49:09.349][INFO][src/environment.c:4214]: Advertised geometry is 0, 0, 1920, 1080
[11:49:09.349][INFO][src/environment.c:4217]: Geometry alignment: 
[11:49:09.349][INFO][src/environment.c:4220]: --------------------------------------------------------------------------
[11:49:16.356][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "Fall"
[11:49:16.356][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "WalkRightAndSit"
[11:49:16.356][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "Fall"
[11:49:16.356][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "WalkLeftAndSit"
[11:50:06.406][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "WalkLeftAndSit"
[11:50:06.406][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "WalkAlongWorkAreaFloor"
[11:50:27.427][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "WalkAlongWorkAreaFloor"
[11:50:27.427][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "GrabIEBottomLeftWall"
[11:50:27.427][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "GrabIEBottomLeftWall"
[11:50:27.427][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "WalkLeftAndSit"
[11:50:34.434][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "WalkRightAndSit"
[11:50:34.434][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "WalkAlongWorkAreaFloor"
[11:50:53.453][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "WalkAlongWorkAreaFloor"
[11:50:53.453][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "GrabWorkAreaBottomLeftWall"
[11:51:13.473][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "GrabWorkAreaBottomLeftWall"
[11:51:13.473][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "HoldOntoWall"
[11:51:40.500][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "WalkLeftAndSit"
[11:51:40.500][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "GrabWorkAreaBottomRightWall"
[11:52:13.533][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "HoldOntoWall"
[11:52:13.533][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "HoldOntoWall"
[11:52:20.540][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "GrabWorkAreaBottomRightWall"
[11:52:20.540][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "ClimbHalfwayAlongWall"
[11:53:02.582][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "HoldOntoWall"
[11:53:02.582][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "HoldOntoWall"
[11:53:13.593][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "Thrown"
[11:53:13.593][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "ClimbIEBottom"
[11:53:13.593][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "ClimbIEBottom"
[11:53:13.593][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "WalkRightAndSit"
[11:53:30.610][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "HoldOntoWall"
[11:53:30.610][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "HoldOntoWall"
[11:53:52.632][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "HoldOntoWall"
[11:53:52.632][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "HoldOntoWall"
[11:54:22.662][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "WalkRightAndSit"
[11:54:22.662][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "HoldOntoCeiling"
[11:54:22.662][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "HoldOntoCeiling"
[11:54:22.662][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "SitDown"
[11:54:40.680][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "HoldOntoWall"
[11:54:40.680][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "FallFromWall"
[11:54:40.680][WARN][src/actions/offset.c:60]: <Mascot:Shimeji.Poros:0> Applying offset: 1, 1016
[11:54:45.685][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "Fall"
[11:54:45.685][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "StandUp"
[11:54:58.698][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "SitDown"
[11:54:58.698][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "StandUp"
[11:55:12.712][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "StandUp"
[11:55:12.712][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "HoldOntoCeiling"
[11:55:12.712][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "HoldOntoCeiling"
[11:55:12.712][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "RunAlongWorkAreaFloor"
[11:55:14.714][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "RunAlongWorkAreaFloor"
[11:55:14.714][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "StandUp"
[11:55:35.735][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "StandUp"
[11:55:35.735][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "WalkLeftAlongFloorAndSit"
[11:56:01.761][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "StandUp"
[11:56:01.761][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "WalkLeftAlongFloorAndSit"
[11:56:25.785][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "WalkLeftAlongFloorAndSit"
[11:56:25.785][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "GrabWorkAreaBottomRightWall"
[11:56:51.811][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "WalkLeftAlongFloorAndSit"
[11:56:51.811][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "GrabWorkAreaBottomLeftWall"
[11:57:02.822][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "GrabWorkAreaBottomRightWall"
[11:57:02.822][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "HoldOntoWall"
[11:57:02.822][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "GrabWorkAreaBottomLeftWall"
[11:57:02.822][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "ClimbAlongWall"
[11:57:50.870][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "HoldOntoWall"
[11:57:50.870][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "FallFromWall"
[11:57:50.870][WARN][src/actions/offset.c:60]: <Mascot:Shimeji.Poros:0> Applying offset: 1919, 1016
[11:57:59.879][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "Fall"
[11:57:59.879][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "GrabIEBottomRightWall"
[11:57:59.879][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "GrabIEBottomRightWall"
[11:57:59.879][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "PullUpShimeji"
[11:58:02.882][WARN][src/actions/offset.c:60]: <Mascot:Shimeji.Jinx:1> Applying offset: 0, 0
[11:58:04.884][INFO][src/mascot.c:706]: <Mascot:Shimeji.Poros:0> Cloning mascot to prototype of type Shimeji.Poros with born behavior PullUp at (1919,0)
[11:58:04.884][INFO][src/mascot.c:961]: <Mascot:Shimeji.Poros:2> Created new mascot of type "Poros" at (1887,96)
[11:58:04.884][INFO][src/mascot.c:1375]: <Mascot:Shimeji.Poros:0> Mascot out of screen bounds (caught at 1940,11 while allowed values are from 0,0 to 1920,1080 (Geometry offset is 0,0)), respawning!
[11:58:06.886][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:2> Completed behavior "PullUp"
[11:58:06.886][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:2> Initialized behavior "HoldOntoCeiling"
[11:58:06.886][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:2> Completed behavior "HoldOntoCeiling"
[11:58:06.886][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:2> Initialized behavior "SitDown"
[11:58:14.894][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "Fall"
[11:58:14.894][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "WalkRightAlongFloorAndSit"
[11:58:57.937][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:2> Completed behavior "SitDown"
[11:58:57.937][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:2> Initialized behavior "WalkLeftAndSit"
[11:59:20.960][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "WalkRightAlongFloorAndSit"
[11:59:20.960][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "WalkRightAndSit"
[11:59:46.986][INFO][src/mascot.c:638]: <Mascot:Shimeji.Poros:0> Completed behavior "WalkRightAndSit"
[11:59:46.986][INFO][src/mascot.c:669]: <Mascot:Shimeji.Poros:0> Initialized behavior "GrabWorkAreaBottomLeftWall"
[11:59:58.998][INFO][src/mascot.c:638]: <Mascot:Shimeji.Jinx:1> Completed behavior "ClimbAlongWall"
[11:59:58.998][INFO][src/mascot.c:669]: <Mascot:Shimeji.Jinx:1> Initialized behavior "WalkRightAlongIEAndJump"
Erreur de segmentation     (core dumped)shimeji-overlayd -se

I can replicate this behavior if more information are needed (I just need 10 minutes). I did not test without Poro because doing shimeji-overlayed -se summon all the Prototypes. Maybe this can be the root cause: it create a warning because Divide action is unknown.

[linarphy]

A quick test with smimejictl mascot summon Jinx give me the same core dump. Not poro’s fault

[linarphy]

I think it’s related to this issue: #49 . I don’t know how to get stack trace so I cannot confirm 100%. As #53 got reverted, the issue reappear I guess ?

[yours57]

Additional KDE core dump: crash in environment_get_border_type_rect

Hi, I’m seeing a reproducible core dump on KDE Plasma Wayland. This looks related to #55, but the stack trace in my case points directly to environment_get_border_type_rect, followed by repeated mascot_action_get_next calls.

Environment

• OS: Arch Linux x86_64

• Desktop environment: KDE Plasma Wayland

• Session:

  • XDG_SESSION_TYPE=wayland
  • XDG_CURRENT_DESKTOP=KDE

• wl_shimeji launch method: user systemd service

• User unit: wl_shimeji.service

• Command line: /usr/bin/shimeji-overlayd

• Mascot: Pusheen

• Package source: AUR / Arch package, exact package versions below

Please let me know if this should go to the main wl_shimeji repository or the KWinSupport plugin repository.

What happened

After starting shimeji-overlayd and summoning the Pusheen mascot, the daemon crashes with SIGSEGV.

The crash happened under the user systemd service:

Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/wl_shimeji.service
User Unit: wl_shimeji.service
Command Line: /usr/bin/shimeji-overlayd
Executable: /usr/bin/shimeji-overlayd
Signal: 11 (SEGV) si_code: SEGV_MAPERR

Coredump stack trace

PID: 1984 (shimeji-overlay)
TID: 1986 (shimeji-overlay)
UID: 1000
GID: 1000
Signal: 11 (SEGV) si_code: SEGV_MAPERR
Timestamp: Sat 2026-07-11 12:33:13 CST
Command Line: /usr/bin/shimeji-overlayd
Executable: /usr/bin/shimeji-overlayd
User Unit: wl_shimeji.service

Stack trace of thread 1986:
#0  0x000055818ce991cb environment_get_border_type_rect (shimeji-overlayd + 0xb1cb)
#1  0x000055818ce9e88a environment_get_border_type (shimeji-overlayd + 0x1088a)
#2  0x000055818cea47d1 mascot_get_border_type (shimeji-overlayd + 0x167d1)
#3  0x000055818ce99712 expression_vm_execute.part.0.constprop.0 (shimeji-overlayd + 0xb712)
#4  0x000055818ce9f28a expression_vm_execute (shimeji-overlayd + 0x1128a)
#5  0x000055818ce9f4e1 mascot_set_behavior (shimeji-overlayd + 0x114e1)
#6  0x000055818cebab09 mascot_ground_check (shimeji-overlayd + 0x2cb09)
#7  0x000055818ce9ea5c mascot_set_action_internal (shimeji-overlayd + 0x10a5c)
#8  0x000055818ce9ef47 mascot_action_get_next (shimeji-overlayd + 0x10f47)
#9  0x000055818ce9f19b mascot_action_get_next (shimeji-overlayd + 0x1119b)
#10 0x000055818ce9f19b mascot_action_get_next (shimeji-overlayd + 0x1119b)
#11 0x000055818ce9f19b mascot_action_get_next (shimeji-overlayd + 0x1119b)
#12 0x000055818ce9f19b mascot_action_get_next (shimeji-overlayd + 0x1119b)
#13 0x000055818ce9f19b mascot_action_get_next (shimeji-overlayd + 0x1119b)
...
#63 0x000055818ce9f19b mascot_action_get_next (shimeji-overlayd + 0x1119b)

Stack trace of thread 1985:
#0  0x00007f6a9c8945be n/a (libc.so.6 + 0x945be)
#1  0x00007f6a9c89b0f9 pthread_mutex_lock (libc.so.6 + 0x9b0f9)
#2  0x000055818ceb445a environment_interpolate (shimeji-overlayd + 0x2645a)
#3  0x00007f6a9c897739 n/a (libc.so.6 + 0x97739)
#4  0x00007f6a9c91bedc n/a (libc.so.6 + 0x11bedc)

Stack trace of thread 1984:
#0  0x00007f6a9c89fff2 n/a (libc.so.6 + 0x9fff2)
#1  0x00007f6a9c89403c n/a (libc.so.6 + 0x9403c)
#2  0x00007f6a9c894084 n/a (libc.so.6 + 0x94084)
#3  0x00007f6a9c91c1b5 epoll_wait (libc.so.6 + 0x11c1b5)
#4  0x000055818ce9309d main (shimeji-overlayd + 0x509d)
#5  0x00007f6a9c827741 n/a (libc.so.6 + 0x27741)
#6  0x00007f6a9c827879 __libc_start_main (libc.so.6 + 0x27879)
#7  0x000055818ce947f5 _start (shimeji-overlayd + 0x67f5)

ELF object binary architecture: AMD x86-64

Current wl_shimeji config

Config:
  - Multiplication (BREEDING) = false
  - Dragging (DRAGGING) = true
  - Window Interactions (WINDOW_INTERACTIONS) = true
  - Window Throwing (WINDOW_THROWING) = false
  - Window Throw Policy (WINDOW_THROW_POLICY) = looping
  - Cursor Position (CURSOR_POSITION) = true
  - Mascot Limit (MASCOT_LIMIT) = 2
  - Allow Throwing Multihead (ALLOW_THROWING_MULTIHEAD) = false
  - Allow Dragging Multihead (ALLOW_DRAGGING_MULTIHEAD) = true
  - Unified Outputs (UNIFIED_OUTPUTS) = false
  - Dismiss Animations (DISMISS_ANIMATIONS) = true
  - Affordances (AFFORDANCES) = true
  - Interpolation Framerate (INTERPOLATION_FRAMERATE) = -1
  - Overlay layer (WLR_SHELL_LAYER) = overlay
  - Tablets Enabled (TABLETS_ENABLED) = false
  - Left Button (POINTER_LEFT_BUTTON) = -1
  - Right Button (POINTER_RIGHT_BUTTON) = -1
  - Middle Button (POINTER_MIDDLE_BUTTON) = -1
  - On Tool Pen Button (ON_TOOL_PEN) = -1
  - On Tool Eraser Button (ON_TOOL_ERASER) = -1
  - On Tool Brush Button (ON_TOOL_BRUSH) = -1
  - On Tool Pencil Button (ON_TOOL_PENCIL) = -1
  - On Tool Airbrush Button (ON_TOOL_AIRBRUSH) = -1
  - On Tool Finger Button (ON_TOOL_FINGER) = -1
  - On Tool Lens Button (ON_TOOL_LENS) = -1
  - On Tool Mouse Button (ON_TOOL_MOUSE) = -1
  - On Tool Button 1 (ON_TOOL_BUTTON1) = -1
  - On Tool Button 2 (ON_TOOL_BUTTON2) = -1
  - On Tool Button 3 (ON_TOOL_BUTTON3) = -1
  - Opacity (OPACITY) = -1.000000
  - Scaling (MASCOT_SCALE) = -1.000000

Reproduction steps

1. Start the daemon through the user systemd service:

systemctl --user start wl_shimeji.service

2. Summon the mascot:

shimejictl mascot summon Pusheen

3. Wait / let the mascot run normally.

4. shimeji-overlayd eventually crashes with SIGSEGV.

Notes

The repeated mascot_action_get_next frames look like the action/behavior selection is recursing many times before the crash. The final crash point is environment_get_border_type_rect, apparently while checking mascot border / ground state through mascot_ground_check.

[yours57]

I found a more specific reproduction path for what seems to be the same crash.

Reproduction:

1. Start shimeji-overlayd.
2. Summon Pusheen.
3. Let the mascot climb/crawl along the top edge of the screen.
4. When it crawls from left to right and reaches the top-right corner, shimeji-overlayd crashes.

This does not look like a random crash anymore. It seems specifically related to the top-right corner / ceiling-to-right-wall border transition.

Backtrace from the new crash:

environment_get_border_type_rect
environment_get_border_type
mascot_get_border_type
expression_vm_execute
mascot_set_behavior
mascot_ground_check
mascot_action_get_next
mascot_action_get_next
mascot_action_get_next
...

The last log lines before the crash include:

WARN src/actions/offset.c:60: <Mascot:Shimeji.Pusheen:0> Applying offset: 903, 1
WARN src/actions/offset.c:60: <Mascot:Shimeji.Pusheen:0> Applying offset: 0, 0

So this may be related to border type detection when the mascot is on the ceiling/top edge and reaches the right screen border.