kern/59043: Memory leak when reading from ATAPI/CAM DVD drive

[Kevin Oberman]

>Number:         59043
>Category:       kern
>Synopsis:       Memory leak when reading from ATAPI/CAM DVD drive
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov 07 10:00:32 PST 2003
>Closed-Date:
>Last-Modified:
>Originator:     Kevin Oberman
>Release:        FreeBSD 5.1-CURRENT i386
>Organization:
ESnet -- The Energy Scienses Network
>Environment:
System: FreeBSD puppeteer.es.net 5.1-CURRENT FreeBSD 5.1-CURRENT #46: Fri Oct 31 10:51:08 PST 2003 oberman at puppeteer.es.net:/usr/obj/usr/src/sys/IBM-T30-D i386

>Description:
	When reading data from an ATAPI/CAM DVD device, I see a
continual leakage of kernel memory. It is visible with:
vmstat -m | grep "ATA r". Looping this every minute shows the kernel
memory usage increasing at the rate of over 2 MB/minute. This means
all available kernel VM is exhausted after about 1 hour of access.
# vmstat -m | grep "ATA r" && sleep 60 && vmstat -m | grep "ATA r"
  ATA request312010 39002K  39002K   316526  128
  ATA request330424 41303K  41303K   334980  128
>How-To-Repeat:
	Using ATAPI/CAM, use mplayer to play a DVD. Watch the system
die after about 60 minutes.
>Fix:
Unknown


>Release-Note:
>Audit-Trail:
>Unformatted: