The error originates from php_sockop_write() which regardless or the REPORT_ERRORS flag outputs a notice, this function is called from php_stream_write()

This is very odd since the 3.0.x versions of the extension doesn't use php_stream_write() or any other stream write functions at all but rather use send() directly. Also, the error message shouldn't say Memcache::set() but rather MemcachePool::set() even if you're instantiating the Memcache class (since it inherits from MemcachePool).

 * Are you sure it's originating from the pecl/memcache 3.0.2 extension and not a previous version (such as 2.2.x) or some other extension? 
 * Can you supply the complete log message?
 * It would really help if there was some kind of way to reproduce the message (or a gdb backtrace of the call stack when the error is emitted :)

Hi, thanks for responding.

I thought I was using 3.0.2, but phpinfo() suggests it was still using 3.0.1. I cant explain that, but its probably a mistake I made, or maybe lighttpd didn't restart properly when I asked it to.

My setup is definitely using 3.0.2 now, so I will monitor the situation and see if it happens again. Ill look into getting a backtrace too.

Your right about the log saying MemcachePool rather than Memcache. Heres a few of the actual log entries, although I doubt it matters unless it happens again on 3.0.2. 

[10-Jan-2009 16:21:45] PHP Notice:  MemcachePool::set() [<a href='memcachepool.set'>memcachepool.set</a>]: send of 7861 bytes failed with errno=11 Resource temporarily unavailable in /var/dmn/html/class_cache.php on line 60
[10-Jan-2009 20:26:10] PHP Notice:  MemcachePool::set() [<a href='memcachepool.set'>memcachepool.set</a>]: send of 15904 bytes failed with errno=11 Resource temporarily unavailable in /var/dmn/html/class_cache.php on line 60
[11-Jan-2009 03:31:21] PHP Notice:  MemcachePool::set() [<a href='memcachepool.set'>memcachepool.set</a>]: send of 32768 bytes failed with errno=11 Resource temporarily unavailable in /var/dmn/html/class_cache.php on line 60

Thanks

Please reopen the bug report if the problem is shown to still exist

Does anyone know if this bug is still open?

If not, what is the fix.
phpinfo() tells me this about my memcache php library:
Version: 3.0.1
Revision: $Revision: 1.83.2.24 $

My memcache server versions are: 1.2.2

I had further problems, but Im not sure it was a memcache bug

Try tweaking your sysctl.conf as shown here
http://cocacoda.blogspot.com/2009/02/memcached-fails-to-set-cache-entry.html

You might also look into making sure local memcache connections are not tracked by conntrack (by setting a raw NOTRACK iptables rule). I continued to have various problems until I did this, and now my setup is stable again.