**System Information**
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14
**Blender Version**
Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: `rB84da05a8b806`
Worked: 2.80 accepts an `index` argument but doesn't crash
**Short description of error**
`bpy.ops.mesh.select_linked_pick` accepts `object_index` and `index` arguments. They are set to `-1` by default (probably indicating that they're not meant to be used). If `object_index` corresponds to an object in the scene and `index` is a negative number, Blender crashes.
**Exact steps for others to reproduce the error**
1. Select the default cube and go into edit mode
2. Open a Python console
3. Run `bpy.ops.mesh.select_linked_pick(object_index=0)`
4. Crash
Alternatively, you can provide any negative index value; it should always crash (although it might run into valid memory if you're lucky)
A debug build reports an access violation:
`SUMMARY: AddressSanitizer: access-violation D:\blender-git\blender\source\blender\editors\mesh\editmesh_select.c:3451 in edbm_select_linked_pick_ex`
Debug stack trace: P2202