kern/57493: UFS_DIRHASH panic during installation

[fekete.zoltan%minux.hu@localhost]

>Number:         57493
>Category:       kern
>Synopsis:       UFS_DIRHASH panic during installation
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 30 11:30:01 +0000 2023
>Originator:     Zoltan Fekete
>Release:        -CURRENT
>Organization:
private
>Environment:
NetBSD XXXXX 10.99.4 NetBSD 10.99.4 (TPL380) #8: Fri Jun 30 07:41:32 CEST 2023  root@XXXXX:/usr/src/sys/arch/amd64/compile/TPL380 amd64
>Description:
I have just built my own kernel in -current.
This 
It seems that there is a panic on certain directory operations. I
experienced in the install phase of a slightly large package with pkgin.
Last call on the stack is ufsdirhash_findslot().

The panic causes also filesystem corruption. fsck_ffs can automatically fix, though.

See my stacktrace image here shot by a phone, sorry for the dusty
screen, it's a workhorse...

https://drive.google.com/file/d/1aR0YcDyKTtCrCdq85byY6RLcGfKUqYqG/view?usp=sharing
>How-To-Repeat:
1. rm -rf /usr/pkg/*
2. rm -rf /var/db/pkgin
3. pkg_add http://cdn.netbsd.org/pub/pkgsrc/packages/NetBSD/x86_64/10.0/All/pkgin
4. pkgin up
5. pkgin in git

Then, when the fetch has finished, and the system starts to install packages, the panic happens. I could reproduce this more than once.
>Fix:
Switched over to GENERIC kernel:

NetBSD U755408N2 10.0_BETA NetBSD 10.0_BETA (GENERIC) #0: Tue May 30 07:21:22 UTC 2023  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64

This works fine as expected.