httpd-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Tianyin Xu <t...@cs.ucsd.edu>
Subject Re: [users@httpd] Unable to create or access scoreboard (anonymous shared memory failure)
Date Wed, 21 Mar 2012 21:22:38 GMT
Hi, Martin,

Thanks a lot! I found the root cause after diving into code.

The error is caused by my wrong settings. I try to create a too big
scoreboard file (which is even bigger than my physical memory). The size of
the scoreboard file is generated in *ap_calc_scoreboard_size() as follows:*

  scoreboard_size = sizeof(global_score);
  scoreboard_size += sizeof(process_score) * server_limit;
  scoreboard_size += sizeof(worker_score) * server_limit * thread_limit;

Then, in open_scoreboard(), it uses mmap() to create the scoreboard file by
shared memory which cause the error.


       rv = apr_shm_create(&ap_scoreboard_shm, scoreboard_size, NULL,
                           global_pool); /* anonymous shared memory */
       if ((rv != APR_SUCCESS) && (rv != APR_ENOTIMPL)) {
           ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
APLOGNO(00004)
                        "Unable to create or access scoreboard "
                        "(anonymous shared memory failure)");
           return rv;
       }

I have to say that the system response is really important. If the code can
check the errno and provide accurate information. User will get less
confused.

Thanks again, Martin. I do appreciate your help!!

Tianyin


On Wed, Mar 21, 2012 at 1:43 AM, Martin Hasicek <martin.hasicek@gmail.com>wrote:

> So you delete file, try to start apache and same error? Was this file
> recreated by apache? Please check again permissions to this file
> (directory). Best way is to switch to apache user and try to wtrite to this
> localtion.
>
> mh
>
> On Wed, Mar 21, 2012 at 5:29 PM, Tianyin Xu <tixu@cs.ucsd.edu> wrote:
>
>> Hi, Martin,
>>
>> Thanks a lot for the response. But it does not work :-(
>>
>> T
>>
>>
>> On Wed, Mar 21, 2012 at 1:01 AM, Martin Hasicek <martin.hasicek@gmail.com
>> > wrote:
>>
>>> Hi,
>>>
>>> search for ScoreBoardFile directive in your configuration. When you
>>> will find it, please remove this file from your disk. After removal, apache
>>> will recreate this file again. Also please ensure, that apache runtime user
>>> has full access to this file.
>>>
>>> mh
>>>
>>>  On Wed, Mar 21, 2012 at 4:47 PM, Tianyin Xu <tixu@cs.ucsd.edu> wrote:
>>>
>>>> Hi, all.
>>>>
>>>> I did a hard reboot because of system crash... and my Apache
>>>> httpd-2.4.1 cannot start with the following error message:
>>>>
>>>> [Wed Mar 21 00:42:56.034927 2012] [core:crit] [pid 32253:tid
>>>> 140720646657856] (22)Invalid argument: AH00004: Unable to create or access
>>>> scoreboard (anonymous shared memory failure)
>>>>
>>>> It seems that my shared memory is corrupted?
>>>>
>>>> Can anyone tell me how to repair and make apache to work?
>>>>
>>>> Thanks in advance!
>>>> Tianyin
>>>>
>>>>
>>>>
>>>> --
>>>> Tianyin XU,
>>>> http://cseweb.ucsd.edu/~tixu/
>>>>
>>>
>>>
>>
>>
>> --
>> Tianyin XU,
>> http://cseweb.ucsd.edu/~tixu/
>>
>
>


-- 
Tianyin XU,
http://cseweb.ucsd.edu/~tixu/

Mime
View raw message