zpool scrub tank && high file system activity caused crash

[Wesley Shields]

On Mon, Mar 24, 2008 at 04:23:19PM -0700, Bert JW Regeer wrote:
> Hey guys,
> 
> I am running FreeBSD 7.0-RELEASE with GENERIC on a AMD XP Athlon 3500+ with 
> 1267 MB of ram, and a GigBit NIC. I am testing out ZFS just for the hell of 
> it, I know, 32 bit is not suggested and runs badly, but it does what it 
> needs to do.
> 
> I was copying large amounts of data for backup purposes from my MacBook Pro 
> to the machine over FTP. At the time I was looking around the man page for 
> zpool, and figured I'd run a zpool scrub just to see how badly it affects 
> performance. It affects it in that it takes down the machine with a dump.
> 
> keyhole# kgdb kernel.debug /var/crash/vmcore.0
> [GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: 
> Undefined symbol "ps_pglobal_lookup"]
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you 
> are
> welcome to change it and/or distribute copies of it under certain 
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386-marcel-freebsd".
> 
> Unread portion of the kernel message buffer:
> panic: vm_page_insert: offset already allocated
> cpuid = 0
> Uptime: 10h58m58s
> Physical memory: 1267 MB
> Dumping 335 MB: 320 304 288 272 256 240 224 208 192 176 160 144 128 112 96 
> 80 64 48 32 16

Out of curiosity, have you done any tuning on this machine?
Specifically some of the stuff mentioned on the wiki?

-- WXS