Re: kern/59955: kernel diagnostic assertion "rw_lock_held(&map->lock)" failed: file "/home/riastradh/netbsd/11/src/sys/uvm/uvm_map.c", line 1704

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

Actually, just taking the read lock in mm_md_kernacc probably isn't
enough, because we really need the access to _remain_ allowed while we
do the uiomove in dev/mm.c.  Can we hold the map lock across uiomove?
Sounds unlikely.  Can we wire the pages with uvm_vslock or something
across the uvm_map_checkprot and uiomove?