kern/59906: lfs wedges when running "ls" in a full file system

["nia%pkgsrc.org@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         59906
>Category:       kern
>Synopsis:       lfs wedges when running "ls" in a full file system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jan 11 12:20:00 +0000 2026
>Originator:     nia
>Release:        current
>Organization:
The NetLFS Fulldation
>Environment:
NetBSD siphon 11.99.4 NetBSD 11.99.4 (SIPHON) #1: Wed Jan  7 18:25:38 CET 2026  nia@siphon:/encrypt/obj/sys/arch/amd64/compile/SIPHON amd64
>Description:
LFS locks up after a couple of large git repositories are cp'd to a
1024mb file system, making it full.

Commands like ls hang forever.

$ ls
[ 6099.3148063] load: 0.32  cmd: ls 15352 [prelockcv] 0.00u 0.00s 0% 2276k

>How-To-Repeat:
# dd if=/dev/zero of=/testfile bs=1m count=1024
# vndconfig vnd0 /testfile
# newfs_lfs -F /dev/rvnd0
# mount /dev/vnd0 /mnt
# cp -R ~/git/[...] /mnt
# cd /mnt
# ls
>Fix: