Bug#1100604: Acknowledgement (PANIC: assert failed at source3/smbd/smb2_oplock.c(156): sconn->oplocks.exclusive_open>=0)

[Timo van Roermund]

Now with the correct link: https://snapshot.debian.org/package/samba/
This version (4.21.4) works for me: 
https://snapshot.debian.org/package/samba/2%3A4.21.4%2Bdfsg-1/

Cheers,

Timo