Re: Segfault during build of accf_dns.ko.full

From: Michael Butler <imb_at_protected-networks.net>
Date: Sat, 07 Nov 2026 21:30:34 UTC
On 11/7/26 13:35, David Wolfskill wrote:
> This has now happened for 2 (different, but still amd64/GENERIC)
> machines, so it appears to be reproducible.
>
> The first was a 32-core headless build machine; the second is a laptop.
> In each case, the machine had been running main-n290715-feab010f4414
> (product of yesterday's daily tracking) and the sources had been updated
> to main-n290746-6d5c80aee3ae this morning; "make buildworld" had
> succeeded, and "make buildkernel" was in progress.
>
> The build typescript from each machine shows:
> ...
>>>> stage 1: configuring the kernel
> ...
>>>> stage 2.3: build tools
> ...
>>>> stage 3.1: building everything
> ...
> *** [accf_data.ko.full] Error code 139
> make[4]: *** accf_data.ko.full removed
> ...
> make[4]: stopped making "all" in /usr/src/sys/modules/accf_data
> .ERROR_TARGET='accf_data.ko.full'
> .ERROR_META_FILE='/common/S4/obj/usr/src/amd64.amd64/sys/GENERIC/modules/usr/src/sys/modules/accf_data/accf_data.ko.full.meta'
> .MAKE.LEVEL='4'
> MAKEFILE=''
> .MAKE.MODE='meta missing-filemon=yes missing-meta=yes silent=yes verbose'
> _ERROR_CMD='ld -m elf_x86_64_fbsd -warn-common --build-id=sha1 -T /usr/src/sys/conf/ldscript.kmod.amd64 -r  -o accf_data.ko.full accf_data.o ; ctfmerge -L VERSION -g -o accf_data.ko.full accf_data.o ; :> export_syms; awk -f /usr/src/sys/conf/kmod_syms.awk accf_data.ko.full  export_syms | xargs -J % objcopy % accf_data.ko.full;'
> ....
>
> The ERROR_META_FILE has:
>
> # Meta data file /common/S4/obj/usr/src/amd64.amd64/sys/GENERIC/modules/usr/src/sys/modules/accf_data/accf_data.ko.full.meta
> CMD ld -m elf_x86_64_fbsd -warn-common --build-id=sha1 -T /usr/src/sys/conf/ldscript.kmod.amd64 -r  -o accf_data.ko.full accf_data.o
> CMD ctfmerge -L VERSION -g -o accf_data.ko.full accf_data.o
> CMD :> export_syms
> CMD awk -f /usr/src/sys/conf/kmod_syms.awk accf_data.ko.full  export_syms | xargs -J % objcopy % accf_data.ko.full
> CWD /common/S4/obj/usr/src/amd64.amd64/sys/GENERIC/modules/usr/src/sys/modules/accf_data
> TARGET accf_data.ko.full
> OODATE accf_data.o
> -- command output --
> Segmentation fault
>
> *** Error code 139
>
> -- filemon acquired metadata --
> ....
>
> I will attach a copy of the file 9from the headless build machine)
> for reference.
>
> Oh: I see that the typescripts are now showing a warning that I had not
> recalled seeing until recently -- e.g.:
>
> make[1]: /usr/src/Makefile.inc1:380: warning: Warning: buildkernel should not be run as root
>
> Peace,
> david

I also ran into this but haven't determined the commit that triggered it.

As a workaround,  I added " WITHOUT_CTF=1" to /etc/make.conf to allow 
builds to complete,

     Michael