Hi! I have a Catalyst website in production, but started to hit some
problems lately. But first a little about my configuration:
Catalyst website using the standard and the latest stable modules.
Linux + Apache 2 + fastcgi running in external mode.
fastcgi server (FCGIProcessManager) with 2 Catalyst children.
The problem is that, once a day, at random time, my application
simply dies, and the only error I see on apache logs is:
FastCGI: server "/tmp/etrading-secure.fcgi" stderr : FastCGI: server
(pid 8122): safe exit after SIGTERM, referer: https://__mysite__";
Digging on the situation, I put strace saving the system calls of
both the fcgiprocessmanager (8120), and the 2 Catalyst children
(8121, 8122) and found this:
- The first child (8121) receives a SIGPIPE and imediatly dies! Here
are the last lines of strace before 8121 dies:
8121 18:17:20 write(4, "\1\6\0\1\26J\6\0\"POST\">\n\t\t\t\t\t<input
type"..., 5744) = -1 EPIPE (Broken pipe)
8121 18:17:20 --- SIGPIPE (Broken pipe) @ 0 (0) ---
I thing SIGPIPE is sent when the client closes the connection before
all data is sent by Catalyst. But why does it terminate?
- The process manager (8120) sees SIGPIPE and sends SIGTERM to the
other child (8122). After the child dies, it turns itself down:
8120 15:42:58 waitpid(-1, [{WIFSIGNALED(s) && WTERMSIG(s) ==
SIGPIPE}], 0) = 8121
8120 18:17:20 --- SIGCHLD (Child exited) @ 0 (0) ---
8120 18:17:20 write(2, "FastCGI: manager (pid 8120): ser"..., 69) = 69
8120 18:17:20 getppid()
(...)
8120 18:17:20 write(2, "FastCGI: manager (pid 8120): sen"..., 56) = 56
8120 18:17:20 kill(8122, SIGTERM) = 0
8120 18:17:20 waitpid(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}],
0) = 8122
8120 18:17:21 --- SIGCHLD (Child exited) @ 0 (0) ---
8120 18:17:21 write(2, "FastCGI: manager (pid 8120): ser"..., 68) = 68
8120 18:17:21 write(2, "FastCGI: manager (pid 8120): dyi"..., 61) = 61
(...)
8120 18:17:21 exit_group(0) = ?
What do you think is wrong here? I think that the catalyst
application should not die when it receives a SIGPIPE. But it could
be another problem. Please advice me. If you need more information
about my environment, please ask!
Cheers,
Rúben
_______________________________________________
List: [email protected]
Listinfo: http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/catalyst
Searchable archive: http://www.mail-archive.com/[email protected]/
Dev site: http://dev.catalyst.perl.org/
