[SOLVED] mount: only root can do that (effective UID is 1677

[khippy]

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host ~ # fdisk -l /dev/sda

Disk /dev/sda: 4076 MB, 4076642304 bytes
255 heads, 63 sectors/track, 495 cylinders, total 7962192 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x001c2022

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63     7961183     3980560+   b  W95 FAT32
host ~ # mount /dev/sda1 /mnt/work/
mount: only root can do that (effective UID is 16777214)
host ~ # whoami; id
root
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),11(floppy),20(dialout),26(tape),27(video)
host ~ # strace -o out mount /dev/sda1 /mnt/work/
mount: only root can do that (effective UID is 16777214)
host ~ # tail out
mmap(NULL, 3704640, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fd7acec8000
close(3)                                = 0
umask(022)                              = 022
open("/dev/null", O_RDWR)               = 3
close(3)                                = 0
getuid()                                = 0
geteuid()                               = 16777214
write(2, "mount: only root can do that (ef"..., 56) = 56
write(2, "\n", 1)                       = 1
exit_group(1)                           = ?

This is only an example of a mount trial as root. Each and everything I want to mount gives the same error and same result.
Is there help available?

[khippy]

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/*
 geteuid.c source file
 Print the real and effective user ID of a process.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
int main( void )
{
        printf( "My real      user ID is %d\n", getuid() );
        printf( "My effective user ID is %d\n", geteuid() );
        return EXIT_SUCCESS;
}

This little C snippet compiles with

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gcc -o geteuid geteuid.c

I call it and it gives :

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host ~ # ./geteuid 
My real      user ID is 0
My effective user ID is 0

So, I assume mount or a helper to mount is broken, here.

[khippy]

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host ~ # ls -l /bin/mount
-rws--x--x 1 16777214 16777214   85912 Apr  8 04:13 mount

I tried reinstalling sys-apps/util-linux-2.19 with no change.
There after I found that I have a couple of files belonging to group and user 16777214.
How can that come?

[khippy]

I found the reason for the error. I had extended my /var/tmp/portage directory by mounting it via bind with another directory from another harddisk:

/etc/fstab:

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/dev/sdb1               /mnt/cool       xfs             noatime         0 2
/mnt/cool/portage /var/tmp/portage none defaults,bind 0 0

When umounting /var/tmp/portage, emerging goes well.
When mounting /var/tmp/portage, the error occours.
So, WTF is causing this? It had worked for months.

Mounted:

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ghost ~ # ls -ld /var/tmp/portage
drwxrwxr-x 6 portage portage 72 Apr 11 02:53 /var/tmp/portage

Umounted:

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host ~ # ls -ld /var/tmp/portage
drwxrwxr-x 3 portage portage 4096 Apr 11 02:51 /var/tmp/portage