socket close hangs and CPU go to 100%


 
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Operating Systems HP-UX socket close hangs and CPU go to 100%
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Old 08-22-2006
socket close hangs and CPU go to 100%

Hello,

I'm currently having a problem with HPUX.

The application is a C app. It's a socket server.
It runs mostly fine, but under some circumstances (I can not replicate it), the app hangs and the CPU goes to 100%.

I have use gdb to attach to the app, and it was doing a close().
the close() system call is the one that is hanging.

--------------------
(gdb) where
#0 0xc00000000031a5d0:0 in _close_sys+0x30 () from /usr/lib/hpux64/libc.so.1
#1 0xc00000000032ac40:0 in close+0x140 () from /usr/lib/hpux64/libc.so.1
#2 0x4000000000053950:0 in server (soc_id=5, client_address={sin_family = 2,
sin_port = 3149, sin_addr = {s_addr = 3489154679},
sin_zero = "\000\000\000\000\000\000\000"}) at src/tpswitch.c:982
#3 0x4000000000055b50:0 in main (argc=1, argv=0x9fffffffffffe8a0)
at src/tpswitch.c:1244
-----------------------

The previous stack trace shows that the app is in _close_sys+0x30() from the c library.

The descriptor passed to close() is a socket descriptor.

Thanks in advance for your Help!
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Jifty::Script::FastCGI(3pm)				User Contributed Perl Documentation			       Jifty::Script::FastCGI(3pm)

NAME
Jifty::Script::FastCGI - A FastCGI server for your Jifty application SYNOPSIS
AddHandler fastcgi-script fcgi FastCgiServer /path/to/your/jifty/app/bin/jifty -initial-env JIFTY_COMMAND=fastcgi Options: --maxrequests maximum number of requests per process --help brief help message --man full documentation DESCRIPTION
FastCGI entry point for your Jifty application options --maxrequests Set maximum number of requests per process. Read also --man. --help Print a brief help message and exits. --man Prints the manual page and exits. DESCRIPTION
When you're ready to move up to something that can handle the increasing load your new world-changing application is generating, you'll need something a bit heavier-duty than the pure-perl Jifty standalone server. "FastCGI" is what you're looking for. If you have MaxRequests options under FastCGI in your config.yml, or command-line option "--maxrequests=N" assigned, the FastCGI process will exit after serving N requests. SERVER CONFIGURATIONS
Apache + mod_fastcgi # These two lines are FastCGI-specific; skip them to run in vanilla CGI mode AddHandler fastcgi-script fcgi FastCgiServer /path/to/your/jifty/app/bin/jifty -initial-env JIFTY_COMMAND=fastcgi DocumentRoot /path/to/your/jifty/app/share/web/templates ScriptAlias / /path/to/your/jifty/app/bin/jifty/ Apache + mod_fcgid + mod_rewrite An alternative to Apache mod_fastcgi is to use mod_fcgid with mod_rewrite. If you use mod_fcgid and mod_rewrite, you can use this in your Apache configuration instead: DocumentRoot /path/to/your/jifty/app/share/web/templates ScriptAlias /cgi-bin /path/to/your/jifty/app/bin DefaultInitEnv JIFTY_COMMAND fastcgi <Directory /path/to/your/jifty/app/bin> Options ExecCGI SetHandler fcgid-script </Directory> <Directory /path/to/your/jifty/app/share/web/templates> RewriteEngine on RewriteRule ^$ index.html [QSA] RewriteRule ^(.*)$ /cgi-bin/jifty/$1 [QSA,L] </Directory> It may be possible to do this without using mod_rewrite. Lighttpd (<http://www.lighttpd.net/>) Version 1.4.23 or newer is recommended, and you may adapt this config: server.modules = ( "mod_fastcgi" ) server.document-root = "/path/to/your/jifty/app/share/web/templates" fastcgi.server = ( "/" => ( "your_jifty_app" => ( "socket" => "/tmp/your_jifty_app.socket", "check-local" => "disable", "fix-root-scriptname" => "enable", "bin-path" => "/path/to/your/jifty/app/bin/jifty", "bin-environment" => ( "JIFTY_COMMAND" => "fastcgi" ), "min-procs" => 1, "max-procs" => 5, "max-load-per-proc" => 1, "idle-timeout" => 20, ) ) ) Versions before 1.4.23 will work, but you should read Plack::Handler::FCGI's lighttpd documentation <http://search.cpan.org/dist/Plack/lib/Plack/Handler/FCGI.pm#lighttpd> for how to configure your server. More information Since this uses Plack::Handler::FCGI, you might also want to read its documentation on webserver configurations <http://search.cpan.org/dist/Plack/lib/Plack/Handler/FCGI.pm#WEB_SERVER_CONFIGURATIONS>. METHODS
run Creates a new FastCGI process. perl v5.14.2 2011-01-25 Jifty::Script::FastCGI(3pm)