X11: Maximum number of clients reached

[Bill Crawford]

Patrick O'Callaghan wrote:
> On Sat, 2009-05-23 at 13:53 +0200, Mildred Ki'Lya wrote:
>> On 05/18/2009 06:34 PM, Patrick O'Callaghan wrote: 
>>> On Mon, 2009-05-18 at 09:26 -0400, Adam Jackson wrote:
>>>> Check the output of 'sudo lsof -p `pidof Xorg`' when this happens.  This
>>>> will show you what file descriptors are in use by the X server.  Last I
>>>> checked this error message was misleading, and could mean either "I've
>>>> hit the client limit" or "I've run out of file descriptors".
>>>>     
>>> That would be:
>>>
>>> su -c lsof -p `pidof X`
>> Hi,
>>
>> So, it happened again. There are 234 opened sockets, and the last file
>> descriptor seems to be 255u, so perhaps there is a limit there. Any
>> ideas on how to find the program responsible for that?
> 
> The 'u' just means the file is opened read/write. The actual fd number
> is 255, which is certainly suspicious. Just for kicks, try 'ulimit -n'
> to see if your open file limit is set too low for some odd reason.

It's not that suspicious :o) look for XFD_SETSIZE and MAXCLIENTS in the 
X server source code. It's still a hardcoded limit in the server.