Hard crash using template_keymap_item_properties with wm.context_toggle #116854

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Owen-Lewery · 2024-01-06T21:59:10+01:00

Owen-Lewery commented

2024-01-06 21:59:10 +01:00

System Information
Operating system: macOS, Linux debian bookworm
Graphics card: Radeon Pro 560X 4G, Nvidia GTX 1050

Blender Version
Broken: 4.0.0 - 4.1 alpha
Worked: 3.6.7

I use the Python API template_keymap_item_properties perhaps unwisely to help users configure operators for later invocation. This has worked fine since at least 3.3. Starting with 4.0.0 doing so causes a hard crash when configuring wm.context_toggle or wm.context_toggle_enum IFF the Context Attributes box is empty. This is the operator invoked by the n key by default in many views. Clicking in the box with content in it works as expected unless you hit delete to clear the content - this also crashes Blender.

This works fine in the keymap prefs so it's possible that the UI there is doing some additional setup that I'm not aware of. If so I'd love to know how to do that. Alternatively I'd love to know a better way than making a fake keymap item to get the magic of template_keymap_item_properties.

Either way this is a hard crash in a place that otherwise works ok.

Exact steps for others to reproduce the error

Open the included .blend,
In the scripts workspace run operator_modal.py
Two operators are shown, render.render and wm.context_toggle. You can interact with most boxes but if you click in 'Context Attributes of the latter Blender (4.0.0+) will crash.

I tried to trace this in lldb but only got this much:

Process 3854181 stopped

thread #1, name = 'blender', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
frame #0: 0x00007fffe6574d59 libc.so.6___lldb_unnamed_symbol4373 + 25 libc.so.6___lldb_unnamed_symbol4373:
-> 0x7fffe6574d59 <+25>: vpcmpeqb (%rdi), %ymm0, %ymm1
0x7fffe6574d5d <+29>: vpmovmskb %ymm1, %eax
0x7fffe6574d61 <+33>: testl %eax, %eax
0x7fffe6574d63 <+35>: je 0x7fffe6574dc0 ; <+128>
(lldb) bt
thread #1, name = 'blender', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
- frame #0: 0x00007fffe6574d59 libc.so.6___lldb_unnamed_symbol4373 + 25 frame #1: 0x00007ffff784a6ad libasan.so.8::__interceptor_strlen(s=0x0000000000000000) at sanitizer_common_interceptors.inc:387:31
  (lldb)

**System Information** Operating system: macOS, Linux debian bookworm Graphics card: Radeon Pro 560X 4G, Nvidia GTX 1050 **Blender Version** Broken: 4.0.0 - 4.1 alpha Worked: 3.6.7 I use the Python API `template_keymap_item_properties` perhaps unwisely to help users configure operators for later invocation. This has worked fine since at least 3.3. Starting with 4.0.0 doing so causes a hard crash when configuring `wm.context_toggle` or `wm.context_toggle_enum` IFF the Context Attributes box is empty. This is the operator invoked by the **n** key by default in many views. Clicking in the box with content in it works as expected _unless_ you hit delete to clear the content - this also crashes Blender. This works fine in the keymap prefs so it's possible that the UI there is doing some additional setup that I'm not aware of. If so I'd love to know how to do that. Alternatively I'd love to know a better way than making a fake keymap item to get the magic of `template_keymap_item_properties`. Either way this is a hard crash in a place that otherwise works ok. **Exact steps for others to reproduce the error** 1. Open the included .blend, 2. In the scripts workspace run `operator_modal.py` 3. Two operators are shown, `render.render` and `wm.context_toggle`. You can interact with most boxes but if you click in 'Context Attributes of the latter Blender (4.0.0+) will crash. I tried to trace this in lldb but only got this much: Process 3854181 stopped * thread #1, name = 'blender', stop reason = signal SIGSEGV: invalid address (fault address: 0x0) frame #0: 0x00007fffe6574d59 libc.so.6`___lldb_unnamed_symbol4373 + 25 libc.so.6`___lldb_unnamed_symbol4373: -> 0x7fffe6574d59 <+25>: vpcmpeqb (%rdi), %ymm0, %ymm1 0x7fffe6574d5d <+29>: vpmovmskb %ymm1, %eax 0x7fffe6574d61 <+33>: testl %eax, %eax 0x7fffe6574d63 <+35>: je 0x7fffe6574dc0 ; <+128> (lldb) bt * thread #1, name = 'blender', stop reason = signal SIGSEGV: invalid address (fault address: 0x0) * frame #0: 0x00007fffe6574d59 libc.so.6`___lldb_unnamed_symbol4373 + 25 frame #1: 0x00007ffff784a6ad libasan.so.8`::__interceptor_strlen(s=0x0000000000000000) at sanitizer_common_interceptors.inc:387:31 (lldb)

wm_context_toggle.blend

916 KiB

Owen-Lewery added the

labels 2024-01-06 21:59:10 +01:00

Iliya Katushenock added the