assert failed: anon->an_lock == amap->am_lock

[Thomas Klausner <wiz%NetBSD.org@localhost>]

Hi!

A couple days ago my main server had a panic:

panic: kernel diagnostic assertion "anon->an_lock == amap->am_lock" failed: file "/disk/storage-202004/archive/foreign/src/sys/uvm/uvm_amap.c", line 781

Googling that string led me to a syzbot run that also saw this (but
was auto-closed after a couple months where it didn't happen):

https://mail-index.netbsd.org/netbsd-syzbot/2024/06/23/msg001600.html

I have a 6 GB core file, in case anyone is interested in details:
-rw-------  1 root  wheel  5898760460 Oct  4 15:56 /var/crash/netbsd.4.core.gz

That's with a NetBSD 10.99.12/amd64 kernel from Sep 23. I don't
remember what I was doing at the time; I guess a bulk build might have
been running, but that happens a lot on that machine :-)

 Thomas