stas 2003/05/04 19:41:41 Modified: src/docs/2.0/user/troubleshooting troubleshooting.pod Log: document how to deal with '(28)No space left on device' startup errors Revision Changes Path 1.7 +44 -0 modperl-docs/src/docs/2.0/user/troubleshooting/troubleshooting.pod Index: troubleshooting.pod =================================================================== RCS file: /home/cvs/modperl-docs/src/docs/2.0/user/troubleshooting/troubleshooting.pod,v retrieving revision 1.6 retrieving revision 1.7 diff -u -r1.6 -r1.7 --- troubleshooting.pod 19 Jan 2003 23:03:45 -0000 1.6 +++ troubleshooting.pod 5 May 2003 02:41:40 -0000 1.7 @@ -21,6 +21,50 @@ =head1 Configuration and Startup +=head2 (28)No space left on device + +httpd-2.0 is not very helpful at telling which device has run out of +precious space. Most of the time when you get an error like: + + (28)No space left on device: + mod_rewrite: could not create rewrite_log_lock + +it means that your system have run out of semaphore arrays. Sometimes +it's full with legitimate semaphores at other times it's because some +application has leaked semaphores and haven't cleaned them up during +the shutdown (which is usually the case when an application +segfaults). + +Use the relevant application to list the ipc facilities usage. On most +Unix platforms this is usually an C<ipcs(1)> utility. For example +linux to list the semaphore arrays you should execute: + + % ipcs -s + ------ Semaphore Arrays -------- + key semid owner perms nsems + 0x00000000 2686976 stas 600 1 + 0x00000000 2719745 stas 600 1 + 0x00000000 2752514 stas 600 1 + +Next you have to figure out what are the dead ones and remove +them. For example to remove the semid 2719745 execute: + + % ipcrm -s 2719745 + +Instead of manually removing each, and if you know that none of listed +the semaphores is really used (all leaked), you can do: + + % ipcs -s | perl -ane '`ipcrm -s $F[1]`' + +httpd-2.0 seems to use key C<0x00000000> for its semaphores, so to +remove only those you can use: + + % ipcs -s | perl -ane '/^0x00000000/ && `ipcrm -s $F[1]`' + +Notice that on other platforms the output of C<ipcs -s> might be +different, so you may need to apply a different one liner. + + =head2 Segmentation Fault when Using DBI Update DBI to at least version 1.31.
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