kern/59758: Stack overflow while running wdattach

[k0ga%shike2.net@localhost]

>Number:         59758
>Category:       kern
>Synopsis:       Stack overflow while running wdattach
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Nov 13 19:25:00 +0000 2025
>Originator:     Roberto E. Vargas Caballero
>Release:        HEAD
>Organization:
>Environment:
The error happens in the init phase of the kernel in the installer image

>Description:
Using the installer image of NetBSD HEAD in a Supermicro 5019A-FTN4 (https://www.supermicro.com/manuals/superserver/1U/MNL-2042.pdf). When the kernel tries to attach the different disks/partitions in atabusconfig_thread a a stack overflow is detected in wdattach, resulting in a panic. A picture with the full backtrace can be located at http://k0ga.sdfeu.org/netbsd-backtrace2.jpg.

>How-To-Repeat:
Boot the Supermicro 5019A-FTN4 with the NetBSD HEAD installer image

>Fix: