BSDI 2.1 + squid => xmalloc problem

Dear Squider,

I have follow problem:
my squid was perfectly work during the several month, but the last week
squid is abnormally terminates about 3 times a day with such diagnostic:

cache.log:

----
FATAL: xmalloc: Unable to allocate 8192 bytes!
Squid Cache (Version 1.1.10): Terminated abnormally.
CPU Usage: user 110 sys 331
Maximum Resident Size: 0 KB
Page faults with physical i/o: 0
97/06/30 16:05:50| storeWriteCleanLog: Starting...
97/06/30 16:06:12|      4096 lines written so far.
97/06/30 16:06:38|      8192 lines written so far.
...
---
Please help.
Squid version 1.1.10 + gmalloc
OS: BSDI 2.1
RAM: 64M
cache_swap: 1.8G
Thanks,
Constantin Belous
const@cris.net