Hi bugs@, I have a panic nearly identical to this one:
https://marc.info/?l=openbsd-bugs&m=170874964321453&w=2 "Subject: panic: ffs_valloc: dup alloc, usb corruption?" OpenBSD 7.7, x86_64, with software raid 1. Standard automatic partition layout. I was running Bitcoind and syncing while extracting ports.tar.gz to /usr. Before this last boot, I was also running Bitcoind, syncing the blockchain, while extracting ports.tar.gz to /usr. The server was unplugged. I booted and it could not automatically fsck /usr. I had to fsck_ffs the /usr partition and I did "F" -- all, or perhaps almost all, of the entires seemed to pertain to /usr/ports. So this seems very similar, and like a long lived bug that after certain fscks, this panic is possible. Not sure how to proceed from here. The earlier report was about FFS on USB and I think there were some doubts that maybe it was more to do with USB than anything else. Thanks! -Henrich