Public bug reported:

Binary package hint: hal

Installed Jaunty yesterday.  AMD 64 dual core.  Experienced several
freezes with applications attempting file dialogs.

This morning, found one cause.  An application had finished an operation
on a USB mass storage device, which I then removed from the system.
Subsequent attempts with other applications to use file dialogs caused
applications to freeze.  System Monitor showed that hald was occupying
virtually 100% of the CPU on one core.  Use of the other core allowed
other applications and the desktop to continue limited operation.

On inspection of logs:

------------------------------------------------------------------------------
kern log, many instances of:
Apr 25 10:30:46 mikehome kernel: [ 2982.467307] FAT: Directory bread(block 
8216) failed

------------------------------------------------------------------------------
daemon.log, many instances of 

Apr 25 11:07:27 mikehome last message repeated 2080 times

(with different counts) following a message:

Apr 25 10:30:41 mikehome hald[2850]: forcibly attempting to lazy unmount
/dev/sdc as enclosing drive was disconnected

------------------------------------------------------------------------------
syslog: combination of the two.
------------------------------------------------------------------------------

This continued even after the application(s)  which had connected to the
USB device were closed.

Nautilus may be involved. (ver 2.26.2) - on restarting Nautilus, the USB
device mount points were visible in the navigation bar with "Unmount" as
a right-click option. Attempting to unmount these gave an error dialog
"Unable to mount..." with the message:  "DBus error
org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible
causes include: the remote application did not send a reply, the message
bus security policy blocked the reply, the reply timeout expired, or the
network connection was broken."

** Affects: hal (Ubuntu)
     Importance: Undecided
         Status: New

-- 
hald loads a core 100% attempting lazy unmount
https://bugs.launchpad.net/bugs/366660
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