5.2-BETA crash with softupdate on / partition at installation

Hi.

  I installed 5.2-BETA dual celeron PC.

  If I was enabled softupdate on / partition in partition
editor(sysinstall) at base file extract time, system was paniced
with below message.

ernel: type 12 trap, code=0
Stopped at	_mtx_assert+0x4e:	movl	0x1c(%ebx),%eax
db>

_mtx_assert
vm_page_set_invalid
brelse
softdep_disk_io_initiation
spec_xstrategy
spec_specstrategy
ufs_strategy
ufs_vnoperate
bwrite
vfs_bio_awrite(....) at vfs_bio_awrite
flushbufqueues(0...) at flushbufqueues
buf_daemon(0,..) at buf_daemon+0xdc
fork_exit(c06...) at fork_exit+0xb4
fork_trampoline() ata fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xce898d7c, ebp = 0 ---

  If I was disable(default) softupdate on / partition, there is no
problem.

  Does anyone have same problem??

  5.1-RELEASE does not have this problem.

---
MIHIRA, Sanpei Yoshiro
Tokyo, Japan.