I have recently started getting this panic.

  panic: vrele: ref cnt

This was before upgrading to 1.4 -current although I have upgraded in
an effort to stop the panics but it still does.  Here is the back trace
I get from the core dump.  I suspect it has to do with the system
running out of resources but I'm not sure where to start increasing
them.

Oh, i386 (AMD K6, 233 MgHz, 128MB RAM)

(gdb) bt
#0  0xf0190e71 in vput (vp=0xfabcde30) at ../../../../kern/vfs_subr.c:908
#1  0xf021d017 in cpu_reboot (howto=256, bootstr=0x0)
    at ../../../../arch/i386/i386/machdep.c:1350
#2  0xf01793e8 in log (level=-266793359, fmt=0xf0190e5c "vrele: bad ref count")
    at ../../../../kern/subr_prf.c:212
#3  0xf0190ed0 in vrele (vp=0xfa914924) at ../../../../kern/vfs_subr.c:933
can not access 0x226204, invalid translation (invalid PDE)
can not access 0x226204, invalid translation (invalid PDE)
can not access 0x226204, invalid translation (invalid PDE)
can not access 0x226204, invalid translation (invalid PDE)
#4  0xf0195e07 in rename_files (
can not access 0x226244, invalid translation (invalid PDE)
can not access 0x226244, invalid translation (invalid PDE)
can not access 0x226244, invalid translation (invalid PDE)
can not access 0x226244, invalid translation (invalid PDE)
    from=0x226204 <Address 0x226204 out of bounds>, 
    to=0x226244 <Address 0x226244 out of bounds>, p=0xfabe89c8, retain=0)
    at ../../../../kern/vfs_syscalls.c:2436
#5  0xf0195a2d in sys_rename (p=0xfabe89c8, v=0xfabcdf88, retval=0xfabcdf80)
    at ../../../../kern/vfs_syscalls.c:2325
#6  0xf0226d4e in syscall (frame={tf_es = 31, tf_ds = 31, tf_edi = 471848, 
      tf_esi = 2253316, tf_ebp = -272639732, tf_ebx = 470028, tf_edx = 471668, 
      tf_ecx = 1, tf_eax = 128, tf_trapno = 3, tf_err = 2, 
      tf_eip = 1074560907, tf_cs = 23, tf_eflags = 642, tf_esp = -272639760, 
      tf_ss = 31, tf_vm86_es = 0, tf_vm86_ds = 0, tf_vm86_fs = 0, 
      tf_vm86_gs = 0}) at ../../../../arch/i386/i386/trap.c:782

-- 
D'Arcy J.M. Cain <darcy@{druid|vex}.net>   |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 424 2871     (DoD#0082)    (eNTP)   |  what's for dinner.