Failed make installworld on a recent -CURRENT

Hi,

I am getting a strange error, when trying to update a recent -CURRENT.
The build happends on 14.2-RELEASE and the tree is shared of NFS.
The error I get is

make[1]: warning: /storage/freebsd/src/current/: Read-only file system.
make[1]: /build/storage/freebsd/src/current/amd64.amd64/toolchain-metadata.mk:1: Using cached toolchain metadata from build at bastion.ttyv0.de on Sun Jun  1 09:08:28 CEST 2025
Bad system call (core dumped)
rescue/sh check failed, installation aborted
--- __installcheck_sh_check ---

dmesg shows
pid 2146 (rescue), jid 0, uid 0: exited on signal 12 (core dumped)
pid 2264 (rescue), jid 0, uid 0: exited on signal 12 (core dumped)

Yesterday everything was fine. Has anyone an idea what could cause this?

--Gordon