[LinuxPPS] PPS not working after Buster upgrade

[Adrian Woodley]

G'day all,

Last night I completed an upgrade of my NTP server to Debian Buster. 
Following a reboot I've found that PPS isn't working. Both NTP and 
ppstest are showing /dev/pps0 isn't updating.

Any suggestions on where I should pursue a bug report - is this likely 
to be in the kernel, utils-linux or pps-tools?

root at Clacks:~# uname -a
Linux Clacks 4.19.0-5-686 #1 SMP Debian 4.19.37-5 (2019-06-19) i586 
GNU/Linux
root at Clacks:~# ntpd --version
ntpd 4.2.8p12 at 1.3728-o (1)
root at Clacks:~# ldattach -V
ldattach from util-linux 2.33.1

ii  pps-tools      1.0.2-1      i386         LinuxPPS support tools and 
headers

root at Clacks:~# dmesg |grep -i pps
[   29.417954] pps_core: LinuxPPS API ver. 1 registered
[   29.423040] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 
Rodolfo Giometti <giometti at linux.it>
[   29.614892] pps_ldisc: PPS line discipline registered
[   38.562336] pps pps0: new PPS source serial1
[   38.594389] pps pps0: source "/dev/ttyS1" added

root at Clacks:~# ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
time_pps_fetch() error -1 (Connection timed out)
time_pps_fetch() error -1 (Connection timed out)

Cheers,

Adrian