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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Plack::Handler(3pm)					User Contributed Perl Documentation				       Plack::Handler(3pm)

NAME
Plack::Handler - Connects PSGI applications and Web servers SYNOPSIS
package Plack::Handler::AwesomeWebServer; sub new { my($class, %opt) = @_; ... return $self; } sub run { my($self, $app) = @_; # launch the AwesomeWebServer and run $app in the loop } # then from command line plackup -s AwesomeWebServer -a app.psgi DESCRIPTION
Plack::Handler defines an adapter (connector) interface to adapt plackup and Plack::Runner to various PSGI web servers, such as Apache2 for mod_perl and Standalone for HTTP::Server::PSGI. It is an empty class, and as long as they implement the methods defined as an Server adapter interface, they do not need to inherit Plack::Handler. If you write a new handler for existing web servers, I recommend you to include the full name of the server module after Plack::Handler prefix, like Plack::Handler::Net::Server::Coro if you write a handler for Net::Server::Coro. That way you'll be using plackup command line option like: plackup -s Net::Server::Coro that makes it easy to figure out which web server you're going to use. METHODS
new $server = FooBarServer->new(%args); Creates a new adapter object. %args can take arbitrary parameters to configure server environments but common parameters are: port Port number the server listens to. host Address the server listens to. Set to undef to listen any interface. run $server->run($app); Starts the server process and when a request comes in, run the PSGI application passed in $app in the loop. register_service $server->register_service($app); Optional interface if your server should run in parallel with other event loop, particularly AnyEvent. This is the same as "run" but doesn't run the main loop. SEE ALSO
rackup perl v5.14.2 2011-02-27 Plack::Handler(3pm)