Suggestion: how to unfreeze during shutdown/logout

Hi all,
From time to time, my iMac freezes during shutdown/logout. I cant really find out the actual cause. May be it was due to the .Mac mirroring, or some external USB devices fail to shutdown properly, whatever the reason is. My question is other than pressing the magic button to shut down, what else can I do to unfreeze it? Please suggest.
Thanks in advance,
Derek.

I also experience hangups during shutdown. Very often I might add, and this is really annoying. I've reinstalled my Mac Pro from scratch twice in the last month, thinking it was an error on my part. Last night, as I shut down (using CTRL-Option-Command-Eject), this is the log I got (I have no halt line, which is strange):
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: LaunchCFMApp [422]:34567 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: System Events [428]:38727 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: LCCDaemon [423]:42755 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: iCalAlarmScheduler [420]:40603 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: iTunesHelper [387]:36611 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: AppleModemOnHold [380]:34059 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: MirrorAgent [375]:33027 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: Finder [374]:31491 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: SystemUIServer [372]:30979 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: SystemUIServer [372]:30467 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: loginwindow [113]:18243 not responding.
Aug 14 23:27:51 freds-computer diskarbitrationd[69]: ATSServer [112]:20227 not responding.
Aug 15 00:39:33 freds-computer kernel[0]: PCI sleep prevented by comaja_iokitkonalh (5)
Aug 15 00:39:33 freds-computer kernel[0]: PCI sleep prevented by PXS4 (1)
Aug 15 03:15:01 freds-computer cp: error processing extended attributes: Operation not permitted
I understand why you can't recover from a hangup when the shutdown process started, as services started to close, but there must be a way to "jolt" the system to force quit hanged or rogue/zombie processes in order to properly shutdown the system. Each time I push the power button to close down the computer, I fear I may corrupt something in the OS or the system disk.
Any thoughts?

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Strange icon during shutdown...

Does anyone else have a strange icon flash on the display for a fraction of a second during shutdown? I running 10.5.1 on my 15" MBP 2.16 Core Duo and have noticed a real weird icon that only shows up occasionally during shutdown. It usually blinks on and off too fast to really see what it is, but I think it is sort of like the symbol on the command key and has a red X across it. I don't have any issues with the MBP with the exception of some files that Disk Utility is having trouble with when I repair permissions which seems to take a long time. It gets to a point where it says time remaining is less than a minute, but keeps going and going for another 3-5 minutes after displaying this:
Repairing permissions for “Macintosh HD”
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Thanks for the tip.
I did as you suggested and the permissions issue is fully resolved. Never had an issue using the Software Update pane, but I'll file the in my overloaded brain for another time.
I haven't seen the strange icon during shutdown again, but I did identify it as the icon for a piece of software called KeyCue. It shows keyboard shortcuts for the active application by holding down the Command key for about 2 seconds.
Thanks again!

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Welcome to Apple Discussions!
To follow on from the advice re ensuring the driver is the latest version before attempting any other fix, if the problem continues, it is by far better to have the system shutdown gracefully by pulling the USB connection than to shutdown by removing power! At worst, disconnecting the USB cable would do no more than cause problems to the system's printer setup files or print queues, but disconnecting the power COULD cause significant damage to directory and file structure on the hard drive, and actually result in the system being unable to boot.

What happen during shutdown oracle database

Dear All,
i have a questions and i enclosed some suggestions for the answer because I'm confused about the answers :
What happens during shutdown oracle database :
and the suggested answer :
1- When shutdown the database with NORMAL or IMMEDIATE option : the database system writes check point before shutting down the database .
2- when you shutdown the database with the IMMEDIATE , option , open transaction are rolled back before the database is shutdown .
3- shutting down the database with abort always requires an instance recovery at the next startup .
please suggest the right answer .
Regards

Hi Anwar,
When you close a database, Oracle writes all database data and recovery data in the SGA to the datafiles and redo log files, respectively. Next, Oracle closes all online datafiles and redo log files.
When you terminate the instance of an open database/use abort command to close and completely shut down the database the writing of all data in the buffers of the SGA to the datafiles and redo log files is skipped. The subsequent reopening of the database requires recovery, which Oracle performs automatically.
I hope this will help you out to understand the process.

What happen during shutdown database

Dear All,
i have a questions and i enclosed some suggestions for the answer because I'm confused about the answers :
What happens during shutdown oracle database :
and the suggested answer :
1- When shutdown the database with NORMAL or IMMEDIATE option : the database system writes check point before shutting down the database .
2- when you shutdown the database with the IMMEDIATE , option , open transaction are rolled back before the database is shutdown .
3- shutting down the database with abort always requires an instance recovery at the next startup .
please suggest the right answer .
Regards
Anwar

First of all shutdown has 4 options
1.Normal
2.Immediate
3.Transactional
4.Abort
Default is normal
Normal: No new connections are allowed. Database and redo buffers are written into disk.Database is closed.
     Backgroud process are terminated.SGA is deallocated. Until and unless all users disconnect, database wont be closed.
Transactional: No client can start a new transaction. Clients get disconnected once their transactions are completed.
     Database and redo buffers are written into disk.Database is closed.Backgroud process are terminated.SGA is deallocated.
Immediate: Current running SQL are not completed. Oracle does not wait for users to disconnect.
     All active transactions are rolled back.Database and redo buffers are written into disk.
     Database is closed.Backgroud process are terminated.SGA is deallocated.
Abort: All users are disconnected.Database and redo buffers are NOT written into disk.
All background processes are killed instantly and instance is abruptly terminated.

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Sounds like the board is bad.
Have you done anything to prove otherwise?
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Hi,
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Why is /home not getting unmounted? or are these just harmless messages?

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We solved the problem by implementing a Servlet filter that takes care of invalidating the user session if the user has logged out (either explicitly or through Global User Inactivity Timeout).
The solution follows the guidelines described in
Oracle Identity Management Application Developer's Guide section "9.4.1 Single Sign-Off and Application Logout" (http://download-uk.oracle.com/docs/cd/B14099_19/idmanage.1012/b14087/mod_osso.htm#BJFGAGIA)
IMHO, the solution is a bit overkill, but it solved the problem. We haven't yet tried the solutions proposed by Rodrigo.

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¯\_(ツ)_/¯

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Suggestion: how to unfreeze during shutdown/logout

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