ZFS Crash with latest current from May 26

Hi

I updated today to latest current (from a current system late april). 
Now, the system is very unstable.

I started a zpool scrub and the system crashed after a few minutes.

loader.conf:
autoboot_delay=3
beastie_disable="YES"
zfs_load="YES"
kern.maxfiles="65536"
kern.maxproc="20480"
#vfs.zfs.arc_min="64M"
#vfs.zfs.arc_max="2G"
vfs.zfs.prefetch_disable="1"
vfs.zfs.zil_disable="1"


FreeBSD 8.0-CURRENT #0: Wed May 27 20:02:24 UTC 2009 
root_at_lisa.foo.ch:/usr/obj/usr/src/sys/GENERIC amd64

CPU:
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(R) CPU            5110  _at_ 1.60GHz (1731.57-MHz 
K8-class CPU)
   Origin = "GenuineIntel"  Id = 0x6f6  Stepping = 6
 
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
 
Features2=0x4e33d<SSE3,DTES64,MON,DS_CPL,VMX,TM2,SSSE3,CX16,xTPR,PDCM,DCA>
   AMD Features=0x20100800<SYSCALL,NX,LM>
   AMD Features2=0x1<LAHF>
   TSC: P-state invariant
real memory  = 4294967296 (4096 MB)
avail memory = 4060078080 (3871 MB)
ACPI APIC Table: <INTEL  S5000XVN>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s)
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
This module (opensolaris) contains code covered b



DDB Output:

FatKernale tlra p 12:p paage gfaeul t fwhaile uin klertnel mode
c puid = 1; apic wiid t= 01
hfa uthe following non-sleepable locks lth veirtual address	=l 0x0
t au:l
   code		= supervisor werite data, pagex noct lpresent
iunstructsion pointier	= 0x2v0:0xfffeff ffsf8l08e28e22p6
  stack poinmter	        = 0x28:0xfufftfff80e779x27 a68r0
fcrame pointer	        = 0x28m:0sxfrff fff80779276e0
cQode segm enbt		= buasfe 0x0f, leimrit 0xf ffff, tylpe 0x1ob
c			= DPL 0k, pres 1, long 1,  de(f32 0, gran 1
parocessor eflags	= interrupt enabled, resurme, IOPL = 0
ccurrent prmocess		= 5142 (mv)
[thread pid 5142 tid 100159 ]
Stopped at      bcopy+0x16:     repe movsq      (%rsi),%es:(%rdi)

b> bt
Tracing pid 5142 tid 100159 td 0xffffff0032172720
bcopy() at bcopy+0x16
dnode_set_blksz() at dnode_set_blksz+0x2ae
dmu_object_set_blocksize() at dmu_object_set_blocksize+0x4c
zfs_grow_blocksize() at zfs_grow_blocksize+0x45
zfs_freebsd_write() at zfs_freebsd_write+0x9e6
VOP_WRITE_APV() at VOP_WRITE_APV+0xfe
vn_write() at vn_write+0x221
dofilewrite() at dofilewrite+0x85
kern_writev() at kern_writev+0x60
write() at write+0x54
syscall() at syscall+0x1bf
Xfast_syscall() at Xfast_syscall+0xd0
--- syscall (4, FreeBSD ELF64, write), rip = 0x80073616c, rsp = 
0x7fffffffe068, rbp = 0x7fffff


More debug information at 
http://www.bsdunix.ch/public/FreeBSD/crash_2009-May_27.txt

The system was pretty stable with current from late April.


Regards,
Thomas