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socket close hangs and CPU go to 100%

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Operating Systems HP-UX socket close hangs and CPU go to 100%
# 1  
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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lldptool-app

lldptool(8)							       Linux							       lldptool(8)

NAME

       APP - Show / manipulate APP TLV configuration

SYNOPSIS

       lldptool -t -i ethx -V APP [-c app]

       lldptool -T -i ethx -V APP [-d] app=prio,sel,pid

DESCRIPTION

       The  APP  TLV  is an informational TLV and will advertise the current configured application table. If the peer APP TLV and a local APP TLV
       match the same selector and protocol field the local parameter is used.

ARGUMENTS

       app    Configures a local application data field using the three parameters priority (prio), selector (sel), and  protocol  (pid).  The	-d
	      option can be provided to remove an entry which matches the three parameters.

Theory of Operations
       The  APP  TLV  is an informational TLV for most end stations it is not expected that setting APP data should be required. Peer data will be
       processed and added to the application data table by default assuming there does not already exist a local entry with matching selector and
       priority fields.

       By adding APP data to the application table it is available for applications, eg iscsid, to query. Applications query for a specific proto-
       col and selector and may use this data to map traffic to the corresponding traffic class.

EXAMPLE &; USAGE
       Configure ISCSI application for priority 4 on eth2
	      lldptool -T -i eth2 -V APP app=4,2,3260

       Configure FCoE application for priority 3 on eth2
	      lldptool -T -i eth2 -V APP app=3,1,35078

       Remove FCoE application for priority 3 on eth2
	      lldptool -T -i eth2 -V APP -d app=3,1,35078

       Display locally configured application table on eth2
	      lldptool -t -i eth2 -V APP -c app

       Display last transmitted APP TLV on eth2
	      lldptool -t -i eth2 -V APP

SOURCE

       o      IEEE 802.1Qaz (http://www.ieee802.org/1/pages/dcbridges.html)

NOTES

       Currently changing the default priority is not supported by default it is set to zero.

SEE ALSO

       lldptool(8), lldpad(8)

AUTHOR

       John Fastabend

open-lldp							   February 2010						       lldptool(8)