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Operating Systems AIX AIX - remote shell (sudo) - signal 11 core system 50 Post 302925543 by achenle on Monday 17th of November 2014 08:07:45 PM
Check for environment variable differences when the app is run remotely. You could be loading the wrong shared object because of a different environment, for example. You might also be running into resource limits on the remote invocation, such as max memory usage.

Can you get a stack trace from a core file? If so, what is the app trying to do when it SEGVs? If you can get a stack trace, can you get a memory map? Where is the code being executed from? What shared library or executable?

Intermittent SEGVs can be tremendously hard to track down. Heap corruption from buffer overflows - the most common cause of intermittent SEGVs - tends to appear almost random at times because of the way heap memory tends to work. (Because of hardware alignment requirements, heap memory from "malloc()/calloc()/etc" and/or "new" tends to be parceled out in 8-byte blocks. So if you malloc() a 25-byte buffer, on most of today's hardware you really get 32 bytes...)

Are you responsible for developing this application? If so, have you ever tried something like Purify? Go look at the cost of that tool, then calculate how much time you've already spent trying to run down this ONE problem...
 
Test Your Knowledge in Computers #210
Difficulty: Easy
Routing protocols like OSPF calculate the shortest route to a destination through the network based on a computer algorithm.
True or False?

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lockd(8c)																 lockd(8c)

Name
       lockd - network lock daemon

Syntax
       /usr/etc/lockd [ -t timeout ] [ -g graceperiod ]

Description
       The  daemon processes lock requests that are either sent locally by the kernel or remotely by another lock daemon.  The NFS locking service
       makes this advisory locking support possible by using the system call and the subroutine.  The daemon forwards  lock  requests  for  remote
       data  to  the  server  site's lock daemon.  The daemon then requests the status monitor daemon, for monitor service.  The reply to the lock
       request is not sent to the kernel until the status daemon and the server site's lock daemon have replied.

       If either the status monitor or server site's lock daemon is unavailable, the reply to a lock request for remote data is delayed until  all
       daemons become available.

       When  a server recovers, it waits for a grace period for all client site daemons to submit reclaim requests.  Client site daemons are noti-
       fied by of the server recovery and promptly resubmit previously granted lock requests.  If a client site's daemon fails	to  secure  previ-
       ously  granted  locks  at  the server site, the daemon sends the signal SIGLOST to all the processes that were previously holding locks and
       cannot reclaim them.

Options
       -t timeout      The daemon uses timeout (in seconds) as the interval instead of the default value  of  15  seconds  to  retransmit  a  lock
		       request to the remote server.

       -g graceperiod  The daemon uses graceperiod (in seconds) as the grace period duration instead of the default value of 45 seconds.

See Also
       fcntl(2), lockf(3), signal(3), statd(8c)

																	 lockd(8c)

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