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.hasi...@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 <t...@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.hasi...@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 <t...@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/