From: Herbert Poetzl (herbert_at_13thfloor.at)
Date: Fri 22 Apr 2005 - 16:00:35 BST
On Fri, Apr 22, 2005 at 12:53:33PM +0200, Francois Duchatelet wrote:
>
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> Hi guys,
>
> I have a very strange problem: even root on the host system can't remove a
> symlink inside one of the vservers space.
>
> Context:
> Kernel 2.4.25
> vserver patch 1.26
> rh 7.3 host server
>
> [root_at_ros1 opt]# rpm -qf `which lsattr`
> e2fsprogs-1.35-7.1
> [root_at_ros1 opt]# mount
> ...
> /dev/md2 on /mnt/raidbak1 type ext3 (rw)
> ...
>
> rostst1 is a RH73 vserver. I tried to unlink with the vserver running or
> stopped
>
>
>
> Session extract:
> - ------------------------
> [root_at_ros1 opt]# pwd
> /mnt/raidbak1/vservers/rostst1/opt
> [root_at_ros1 opt]# ls -l de?
> lrwxrwxrwx 1 root root 3 Apr 22 12:07 de0 -> vm4
> lrwxrwxrwx 1 root root 3 Oct 9 2004 dev -> vm4
> [root_at_ros1 opt]# lsattr de?
> - ------------- de0
> - ------------- dev
hmm, could you add the output of:
lsattr -d /mnt/raidbak1/vservers/rostst1/opt
showattr -d /mnt/raidbak1/vservers/rostst1/opt
showattr /mnt/raidbak1/vservers/rostst1/opt/de*
> [root_at_ros1 opt]# strace -e trace=file rm -f dev
> ...
> lstat64(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> lstat64("dev", {st_mode=S_IFLNK|0777, st_size=3, ...}) = 0
> unlink("dev") = -1 EPERM (Operation not
> permitted)
> ...
> [root_at_ros1 opt]# rm -f de0
> [root_at_ros1 opt]# ls -l de?
> lrwxrwxrwx 1 root root 3 Oct 9 2004 dev -> vm4
> - --------------------------------
>
> The problem symlink is 'dev'.
> 'de0' is another symlink I just created to compare: this one can be removed
> whithout any problems.
> While the vserver was stopped, I checked with 'lsof' that no processes
> would have a file opened using that link. Which is obviously not that case.
what does a forced e2fsck report?
do you have any unusual/related messages in the syslog/klog/dmesg?
> For the moment, it is just slightly annoying, because I can work around.
> But I have some other files around which also show the same behaviour. It's
> like a virus: it's spreading :-).
very strange ...
HTH,
Herbert
> I'm stuck here.
>
> Are there other tools I can use to track this problem ?
>
> TIA
>
>
> François Duchatelet,
> Ariane Services
> Rue du Verregat, 12
> B-1020 Brussels
> TEL:+32(2)479.37.59 - FAX:+32(2)478.14.20
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>
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