[squid-users] FATAL: Too many queued redirector requests

Hi, I don't know how to handle memory for squid. Squid automatically
breaks down itself and restarts:

In my squid.conf I set:

url_rewrite_children 120 startup=30 idle=100 concurrency=0
max_filedesc 7168
cache_swap_low 60
cache_swap_high 80

I notice that just one pending requests queued:

2011/06/09 11:00:17| WARNING: All redirector processes are busy.
2011/06/09 11:00:17| WARNING: 1 pending requests queued

and follow is more details of cache.log:

2011/06/09 11:00:16| WARNING: Cannot run
'/opt/squid-3.1.10/urlrewriter_new.pl' process.
2011/06/09 11:00:16| ipcCreate: fork: (12) Cannot allocate memory
2011/06/09 11:00:16| WARNING: Cannot run
'/opt/squid-3.1.10/urlrewriter_new.pl' process.
2011/06/09 11:00:16| ipcCreate: fork: (12) Cannot allocate memory
2011/06/09 11:00:16| WARNING: Cannot run
'/opt/squid-3.1.10/urlrewriter_new.pl' process.
2011/06/09 11:00:16| ipcCreate: fork: (12) Cannot allocate memory
2011/06/09 11:00:16| WARNING: Cannot run
'/opt/squid-3.1.10/urlrewriter_new.pl' process.
2011/06/09 11:00:17| WARNING: All redirector processes are busy.
2011/06/09 11:00:17| WARNING: 1 pending requests queued
2011/06/09 11:00:17| storeDirWriteCleanLogs: Starting...
2011/06/09 11:00:17| WARNING: Closing open FD  177
2011/06/09 11:00:17|   Finished.  Wrote 16367 entries.
2011/06/09 11:00:17|   Took 0.01 seconds (1308941.14 entries/sec).
FATAL: Too many queued redirector requests
Squid Cache (Version 3.1.10): Terminated abnormally.
<----------------------------------  CRASH ***
CPU Usage: 6631.678 seconds = 4839.266 user + 1792.412 sys
Maximum Resident Size: 0 KB
Page faults with physical i/o: 3299
Memory usage for squid via mallinfo():
        total space in arena:  -1160028 KB
        Ordinary blocks:       -1289701 KB  53024 blks
        Small blocks:               0 KB      1 blks
        Holding blocks:         15976 KB      6 blks
        Free Small blocks:          0 KB
        Free Ordinary blocks:  129672 KB
        Total in use:          -1273725 KB 110%
        Total free:            129672 KB -10%
2011/06/09 11:00:26| Starting Squid Cache version 3.1.10 for
x86_64-unknown-linux-gnu...
2011/06/09 11:00:26| Process ID 31241
2011/06/09 11:00:26| With 7168 file descriptors available
Received on Thu Jun 09 2011 - 08:16:26 MDT