Can you please run an exp-run for head with https://reviews.freebsd.org/D23837 patched? Note that you will need a head that is at r359054 or later for the patch to apply cleanly. I promise I just ran a fresh make tinderbox, so this one should build world the first time.
There is 1 new failure: devel/strace Failure log: http://package23.nyi.freebsd.org/data/headi386PR244939-default/2020-03-27_06h45m06s/logs/errors/strace-4.5.18_1.log
Thanks, strace will have to be marked BROKEN on 13. It uses the procfs debugging instead of ptrace(). It's also i386 only, and it's functionality should already be available via in-tree truss.
A commit references this bug: Author: jhb Date: Wed Apr 1 19:22:15 UTC 2020 New revision: 359530 URL: https://svnweb.freebsd.org/changeset/base/359530 Log: Retire procfs-based process debugging. Modern debuggers and process tracers use ptrace() rather than procfs for debugging. ptrace() has a supserset of functionality available via procfs and new debugging features are only added to ptrace(). While the two debugging services share some fields in struct proc, they each use dedicated fields and separate code. This results in extra complexity to support a feature that hasn't been enabled in the default install for several years. PR: 244939 (exp-run) Reviewed by: kib, mjg (earlier version) Relnotes: yes Differential Revision: https://reviews.freebsd.org/D23837 Changes: head/ObsoleteFiles.inc head/lib/libsysdecode/Makefile head/sys/amd64/amd64/trap.c head/sys/amd64/amd64/vm_machdep.c head/sys/amd64/ia32/ia32_reg.c head/sys/amd64/ia32/ia32_signal.c head/sys/amd64/ia32/ia32_syscall.c head/sys/arm/arm/syscall.c head/sys/arm64/arm64/trap.c head/sys/compat/ia32/ia32_sysvec.c head/sys/conf/files head/sys/fs/procfs/procfs.c head/sys/fs/procfs/procfs.h head/sys/fs/procfs/procfs_ioctl.c head/sys/i386/i386/trap.c head/sys/i386/i386/vm_machdep.c head/sys/kern/imgact_elf.c head/sys/kern/kern_exec.c head/sys/kern/kern_exit.c head/sys/kern/kern_fork.c head/sys/kern/kern_prot.c head/sys/kern/kern_sig.c head/sys/kern/kern_thread.c head/sys/kern/subr_syscall.c head/sys/kern/subr_trap.c head/sys/kern/sys_process.c head/sys/mips/mips/trap.c head/sys/modules/procfs/Makefile head/sys/powerpc/powerpc/trap.c head/sys/riscv/riscv/trap.c head/sys/sys/param.h head/sys/sys/pioctl.h head/sys/sys/proc.h
Patch to mark devel/strace BROKEN: https://reviews.freebsd.org/D24254
A commit references this bug: Author: jhb Date: Wed Apr 15 16:22:16 UTC 2020 New revision: 531773 URL: https://svnweb.freebsd.org/changeset/ports/531773 Log: Mark devel/strace as broken on 13.0 and later. FreeBSD 13 removes procfs-based process debugging which strace(1) uses. Users can use truss in the base system instead. PR: 244939 Reviewed by: sbz (maintainer) Differential Revision: https://reviews.freebsd.org/D24254 Changes: head/devel/strace/Makefile