unkillable process

Matthew Dillon dillon at apollo.backplane.com
Fri Oct 6 13:34:14 PDT 2006

:I have a gtkpod process running that is unkillable.  Neither -QUIT or
:-KILL help.  From top:
:71889 root     152   0 18064K 14112K vfs_bu   0:08  0.00%  0.00%
: DragonFly 1.7.0-DEVELOPMENT #6: Fri Oct  6 10:53:26 EDT 2006     
:gtkpod successfully unmounted /ipod and then hung.  I cannot kill it.
:I believe vfs_bu in the STATE column of top may be a clue.  Ktrace
:returns a size 0 ktrace.out file.

    It is probably related to the /ipod unmounting operation.  The wait state
    "vfs_bu" is "vfs_busy", which occurs when the kernel needs to access
    a mount point during unmounting.  For some reason it is not being
    woken up.  It is probably a race between two processes but the only way
    I can tell for sure is if you can get a kernel core out of it.

					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>

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