My attempt to figure out which cifs bug was relevant was the last thing in the forum post, specifically here.
Revisiting a bit (I’m not up for a deeper dive), I’m thinking the bug I had my eye on is patched in Leap 15.1.
openSUSE alert openSUSE-SU-2021:0075-1 (kernel)
openSUSE alert openSUSE-SU-2021:0060-1 (kernel)
cifs: allow syscalls to be restarted in __smb_send_rqst() (bsc#1176956).
so maybe it was a different CIFS problem that got you.
and I have no idea if that means Leap might get more conservative in what patches the kernel has in it…