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Re: port-arm/54199: arm bus_dmamap_sync assertion failure

The following reply was made to PR port-arm/54199; it has been noted by GNATS.

From: Izumi Tsutsui <>
Subject: Re: port-arm/54199: arm bus_dmamap_sync assertion failure
Date: Tue, 14 May 2019 00:02:14 +0900

 > System was copying a large amount of data (comprised mostly of small files) from one USB-attached SSD to another.  "tar" command output was being relayed over an ssh session.  At some point, the kernel panic'd:
 > [ 1735156.504667] panic: kernel diagnostic assertion "offset < map->dm_mapsize" failed: file "../../../../arch/arm/arm32/bus_dma.c", line 1051 offset 0 mapsize 0
 I have a question:
  Is it a valid operation to call bus_dmamap_load(9) and bus_dmamap_sync(9)
  with dmamap dm_mapsize == 0?
 In that case, the assertion "offset < map->dm_mapsize" always fails
 even in case of offset==0.
 Back in 2011 there was a report that src/sys/dev/ic/ahcisata_core.c
 could cause zero-sized dmamap:
 and I committed a fix to avoid such calls.
 Maybe some other drivers have the similar ops, but if it's vaild ops
 all assertion should be fixed.
 Izumi Tsutsui

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