crash when bpf is used heavily

on latest -current, I did change the BPF_MAXBUFSIZE in sys/net/bpf.h to 16 Mb
Actual BPF buffer size is 4Mb:

$ sysctl -a | grep bpf
debug.bpf_bufsize: 4194304
debug.bpf_maxbufsize: 16777216

Now, I run number of bpf-aware processes, and this causes crash
with following kernel message:

panic: kmem_malloc(4194304) too small: 271405056 total allocated
at line 335 in file ../../../vm/vm_kern.c
cpuid=0;
boot() called on cpu#0


the system is -current, HP proliant 2-xeon:
Copyright (c) 1992-2004 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.2-CURRENT #1: Thu May 27 14:48:50 GMT 2004
    root_at_valenok:/usr/src/sys/i386/compile/VALENOK
Preloaded elf kernel "/boot/kernel/kernel" at 0xc086e000.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2787.11-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf29  Stepping = 9
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs
real memory  = 3221200896 (3071 MB)
avail memory = 3150893056 (3004 MB)
MPTable: <COMPAQ   PROLIANT    >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  6
ioapic0: Assuming intbase of 0
ioapic1: Assuming intbase of 16
ioapic2: Assuming intbase of 32
ioapic3: Assuming intbase of 48
ioapic0 <Version 1.1> irqs 0-15 on motherboard
ioapic1 <Version 1.1> irqs 16-31 on motherboard
ioapic2 <Version 1.1> irqs 32-47 on motherboard
ioapic3 <Version 1.1> irqs 48-63 on motherboard

--skipped --


kernel config is attached