Messages in this thread | | | Date | Wed, 06 Mar 2002 17:33:45 +0900 | From | Michael Cheung <> | Subject | Re[2]: mount -o remount,ro cause error "device is busy" |
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hi,
maybe i am wrong, but I really can't find any other process runing.
my step is: 1) "/" and "/usr" are busy 2) shut down to single user mode 3) "/" still busy 4) "/usr" can be unmounted, but can't mount -o ro,remount /usr, show busy error. 5) umount -a, after this, only /proc and / exist. 6) mount -o ro,remount /, show busy error.
I have mentioned I have used "ps aux" to check the process list, there are no user process left. except the following: (repost) root 1 0.1 0.7 1056 484 ? S 15:46 0:04 init [S] root 2 0.0 0.0 0 0 ? SW 15:46 0:00 [keventd] root 3 0.0 0.0 0 0 ? SWN 15:46 0:00 [ksoftirqd_CPU0] root 4 0.0 0.0 0 0 ? SW 15:46 0:00 [kswapd] root 5 0.0 0.0 0 0 ? SW 15:46 0:00 [bdflush] root 6 0.0 0.0 0 0 ? SW 15:46 0:00 [kupdated] root 1042 0.0 0.7 1056 484 tty1 S 16:33 0:00 init [S] root 1043 0.6 1.5 1840 1004 tty1 S 16:33 0:00 /bin/sh root 1045 0.0 1.0 2260 680 tty1 R 16:33 0:00 ps aux
and I also checked by fuser -v /usr, only used by kernel. and fuser -c /, show many process list above.
If i have a mistake, would you like to tell me where is the mistake?
thanks.
Regards; Michael
On Wed, 6 Mar 2002 01:15:19 -0700 Andreas Dilger <adilger@clusterfs.com> wrote:
> On Mar 05, 2002 23:49 -0800, Mike Fedyk wrote: > > On Wed, Mar 06, 2002 at 04:40:10PM +0900, Michael Cheung wrote: > > > I have upgraded my kernel to version 2.4. > > > And i have tested 2.4.16 and 2.4.18. Both of these > > > two version have the same problem when system reboot. > > > "/: device is busy"; > > > in shutdown script: > > > umount -a > > > mount -n -o ro,remount / > > > these two line result error: device is busy. > > > > > > > We need more info about your config. Do you have any patches in this > > kernel? What modules have been loaded? Highmem? x86? drive controller? > > drive? ram size? lspci output, etc... > > Please don't send that. It clearly appears to be a user problem. > Order of operations, as I read in the original email: > 1) "/" and "/usr" are busy > 2) shut down to single user mode > 3) "/" still busy > 4) "/usr" can be unmounted > 5) didn't check that root can be remounted after umounting "/usr" > > Clearly, some program is keeping "/usr" busy (which is keeping "/" busy) > before the change to single user mode. Just a bit of "lsof" needed to > find such things. > > Cheers, Andreas > -- > Andreas Dilger > http://sourceforge.net/projects/ext2resize/ > http://www-mddsp.enel.ucalgary.ca/People/adilger/ > >
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