re: panic: kernel diagnostic assertion "offset < map->dm_maps" failed

[matthew green <mrg%eterna.com.au@localhost>]

> panic: kernel diagnostic assertion "offset < map->dm_maps" failed: file "/usr/src/sys/arch/x86/x86/bus_dma.c", line 826 bad offset 0x0 >= 0x0

this is from:

KASSERTMSG(offset < map->dm_mapsize,
    "bad offset 0x%"PRIxBUSADDR" >= 0x%"PRIxBUSSIZE,
    offset, map->dm_mapsize);

the mapsize being zero indicates that there's nothing mapped
currently in this dma map, so there's nothing to sync.  ie,
the caller seems to be trying to sync something not mapped.

can you post the full back trace?


.mrg.