>Number: 1893 >Category: os-linux >Synopsis: Server halts for apparently no reason >Confidential: no >Severity: non-critical >Priority: medium >Responsible: apache >State: open >Class: sw-bug >Submitter-Id: apache >Arrival-Date: Sun Mar 1 13:10:00 PST 1998 >Last-Modified: >Originator: [EMAIL PROTECTED] >Organization: apache >Release: 1.2.5 >Environment: Linux wipd.com 2.0.33 #3 Fri Feb 20 06:25:31 MST 1998 i686 unknown GCC 2.7.2.3 >Description: I run a heavily-loaded web server, and everyone once in a while, the web server will halt and not spawn any more, so I just have a script that restarts httpd automatically. Lately it has been happening every 20-30 minutes, and I have been unable to find a solution so that the web server would be halting at all. Here is an strace on the root httpd process when it is halted.
wait4(-1, NULL, WNOHANG, NULL) = -1 ECHILD (No child processes) nanosleep(0xbffffe34, 0xbffffe34, 0x400f8f94, 0xffffffff, 0x80b774c) = 0 wait4(-1, NULL, WNOHANG, NULL) = -1 ECHILD (No child processes) nanosleep(0xbffffe34, 0xbffffe34, 0x400f8f94, 0xffffffff, 0x80b774c) = 0 wait4(-1, NULL, WNOHANG, NULL) = -1 ECHILD (No child processes) nanosleep(0xbffffe34, 0xbffffe34, 0x400f8f94, 0xffffffff, 0x80b774c) = 0 Normally you will see getpid's and fork's when it is running properly, like this: getpid() = 29028 fork() = 29083 wait4(-1, NULL, WNOHANG, NULL) = 0 nanosleep(0xbffffe34, 0xbffffe34, 0x400f8f94, 0xffffffff, 0x80b774c) = 0 getpid() = 29028 fork() = 29087 wait4(-1, NULL, WNOHANG, NULL) = 0 nanosleep(0xbffffe34, 0xbffffe34, 0x400f8f94, 0xffffffff, 0x80b774c) = 0 getpid() = 29028 fork() = 29089 wait4(-1, NULL, WNOHANG, NULL) = 0 nanosleep(0xbffffe34, 0xbffffe34, 0x400f8f94, 0xffffffff, 0x80b774c) = 0 I can't have it be doing this all the time obviously... >How-To-Repeat: Today, you will see my server on and off: www.wipd.com. It gets to the 'contacted www.wipd.com' part, but doesn't go on. >Fix: If it sees that there are no children, restart. Or if it sees that it is not getpid'ing and fork'ing itself, restart (or start forking manually). %0 >Audit-Trail: >Unformatted: [In order for any reply to be added to the PR database, ] [you need to include <[EMAIL PROTECTED]> in the Cc line ] [and leave the subject line UNCHANGED. This is not done] [automatically because of the potential for mail loops. ]
