kern/119885: kernel panic during heavy ZFS load: "kmem_map too small"

[Johan A. van Zanten]

>Number:         119885
>Category:       kern
>Synopsis:       kernel panic during heavy ZFS load: "kmem_map too small"
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jan 22 05:40:00 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Johan A. van Zanten
>Release:        FreeBSD 7.0-PRERELEASE i386
>Organization:
>Environment:
System: FreeBSD laozi 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #5: Tue Jan 1 03:14:
32 CST 2008 johan at laozi:/local/build/FreeBSD/obj/i386/tew/006/no-backup/src/Free
BSD/FreeBSD-7.0/src/sys/DONGFEN i386


>Description:

 I was using running a tar pipelineto copy a 320GB+ data from an NFS
mount to a local ZFS files system, comprised of two 750 GB SATA drives in
a RAID-0 type arrangement.  NFS mount is over gigabit ethernet.  TCP, v3,
read and write sizes are set to 65536.

kernel panic after copying about 310 GB.

panic string

Jan 21 11:54:39 laozi savecore: reboot after panic: kmem_malloc(16384): kmem_map
 too small: 335474688 total allocated
Jan 21 11:54:39 laozi savecore: writing core to vmcore.0

Please let me know how i can upload the crash dump.

>How-To-Repeat:

zpool create barf disk1 disk2
cd /nfsmount
tar cbf 63 . - | (cd /barf  ; tar xbf 63 - )

>Fix:

unknown


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