Re: Re[2]: mount -o remount,ro cause error "device is busy"

From: Andreas Schwab (schwab@suse.de)
Date: Wed Mar 06 2002 - 04:47:02 EST


Michael Cheung <vividy@justware.co.jp> writes:

|> 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?

Check for references to deleted files (/proc/*/fd). "init u" should help.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
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This archive was generated by hypermail 2b29 : Thu Mar 07 2002 - 21:00:53 EST