I've recently installed lighttpd with php5 on my WL500G Premium according to this tutorial http://www.rabinovich.org/ymheebcex/ and everything seems just fine when looking at phpinfo();

Troubles come, though, when I try to resize images using imagecopyresample() from gd library. I realize that it's not a very good idea to resize images on something running at 266Mhz, but I need it very rarely, so I hoped it could work if I set script timeout long enough.

The problem is that when I try to resize .png image, after couple of seconds, I get following message on root's console:

Allowed memory size of 8 bytes exhausted (tried to allocate 256 bytes)

If I immediately run free command, I get this result:

free
              total         used         free       shared      buffers
  Mem:        30512        21488         9024            0         2180
 Swap:      4016208            0      4016208
Total:      4046720        21488      4025232

The memory limit in php is set to 64M.

Moreover, when I try to resize .jpeg file, I immediately get the following error:

(mod_cgi.c.584) cgi died, pid: 630

Can someone guess what might be the reason of these errors?

Try to set a mem limit to 2M, 4M or 8M in php.ini ... any changes?

No, it seems it's always the same, getting the error with any of the settings.