KDE4 crashed, how to recover?

[Unga]

Hi all

My computer runs FreeBSD 9.1 (i386) and KDE is version 4.8.4.

Computer hanged, had to force power down from the power button.

After that FreeBSD runs well but when try to start KDE, it prints following and immediately reboots:

Generating KDM configuration.
panic: Bad effnlink fip 0x..., fdp 0x..., tdp 0x....
cpuid = 2
KDB: stack backtrace:
#0 0x... at kdb_backtrace
#1 0x... at panic
#2 0x... at ufs_rename
#3 0x... at VOP_RENAME_APV
#4 0x... at kern_renameat
#5 0x... at kern_rename
#6 0x... at sys_rename
#7 0x... at syscall
#8 0x... at Xint0x80_syscall

How to recover from this issue?

Many thanks in advance.

Unga