Problems with FreeBSD-15.0-CURRENT-amd64-20241003

Hi

I don't often update my 15-0-CURRENT VM. I did last week and I'm getting 
several issues.

Firstly, a bit annoying, both pkg and ksh93 fail to run, giving.
ld-elf.so.1: Shared object "libmd.so.6" not found, required by "ksh93"

Next I'm getting a lot of new Valgrind test failures. I haven't done any 
detailed debugging yet.

One hang in a DRD test calling syscall 454 SYS__umtx_op.

One for me, it looks like libc sendmsg has been re-implemented to use 
socketcall.

The biggest problem is with Helgrind. All apps now generate an extra error

==68593== Thread #1: Exiting thread still holds 1 lock
==68593==    at 0x4BBB5DA: _exit (in /lib/libsys.so.7)
==68593==    by 0x49FC1C0: exit (in /lib/libc.so.7)
==68593==    by 0x491CA10: __libc_start1 (in /lib/libc.so.7)
==68593==    by 0x20182F: (below main) (crt1_s.S:83)

I tried building Helgrind with pthread tracing turned on but that just 
gave me one more problem - a crash due to the tracing fprintf 
(https://bugs.kde.org/show_bug.cgi?id=494327).

A+
Paul