Re: Unable to create or access scoreboard (anonymous shared memory failure) (Apache Users)

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!!

On Wed, Mar 21, 2012 at 1:43 AM, Martin Hasicek <martin.hasicek@xxxxxxxxx> 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@xxxxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxxxx> 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/