[Icecast] EROR connection/wait_for_serversock signalfd descriptor became invalid

[tzara]

 hello,

 I am tying to get to the bottom of why my icecast server crashed and 
 failed to restart.
 The last entry in the error log is this:

 [2012-08-26  05:46:38] INFO source/source_read listener count on 
 /stream now 7
 [2012-08-26  05:48:02] INFO connection/wait_for_serversock HUP 
 received, reread scheduled
 [2012-08-26  05:48:02] INFO connection/connection_thread connection 
 thread finished
 [2012-08-26  05:48:02] EROR connection/wait_for_serversock signalfd 
 descriptor became invalid, doing thread restart

 i am running a debian wheezy vm with multimedia repos enabled:

 root at stream:~# uname -a
 Linux stream 2.6.32-13-pve #1 SMP Mon Jul 9 08:39:20 CEST 2012 i686 
 GNU/Linux
 root at stream:~# icecast2 -v
 Icecast 2.3.3-kh2

 googling only resulted in the source code of the error:
 http://svn.xiph.org/icecast/branches/kh/icecast/src/connection.c

 <snip>
 if (ufds[i].revents & (POLLNVAL|POLLERR))
         {
             ERROR0 ("signalfd descriptor became invalid, doing thread 
 restart");
             slave_restart(); // something odd happened
         }
 </snip>

 any ideas what my be the cause of my problems?

 thanks

 rob