Swap Space Not Being Used?

[Tod Merley]

On 9/21/06, Rick Bilonick <rab at nauticom.net> wrote:
> On Fri, 2006-09-22 at 00:35 -0400, Dave Jones wrote:
> > On Fri, Sep 22, 2006 at 12:27:20AM -0400, Rick Bilonick wrote:
> >
> >  > Unable to find swap-space signature
> >  > Unable to find swap-space signature
> >  > Unable to find swap-space signature
> >  > Unable to find swap-space signature
> >  > Unable to find swap-space signature
> >  > Unable to find swap-space signature
> >  >
> >  > A few days ago (right before this problem started), I installed acpitool
> >  > and I tried to do a suspend (which didn't work). I think that screwed
> >  > something up!
> >
> > mkswap /dev/hda6, and then it should work.
> >
> >       Dave
> >
>
> OK, I rebooted but still get:
>
> > dmesg | grep swap
>
> Kernel command line: ro root=/dev/VolGroup00/LogVol00 rhgb quiet
> resume2=swap:/dev/hda6
> audit(1158902797.697:4): avc:  denied  { unlink } for  pid=1852
> comm="swapon" name="blkid.tab.old" dev=dm-0 ino=1736154
> scontext=system_u:system_r:fsadm_t tcontext=root:object_r:etc_t
> tclass=file
> audit(1158902797.809:5): avc:  denied  { unlink } for  pid=1852
> comm="swapon" name="blkid.tab.old" dev=dm-0 ino=1736154
> scontext=system_u:system_r:fsadm_t tcontext=root:object_r:etc_t
> tclass=file
>
> This gets swap going:
> root at ophth-bilora chippy]# /sbin/swapon /dev/hda6
>
> But how do I get this to work automatically like it used to?
>
> Rick B.
>
>
>
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Hi Rick Bilonick!

I believe the "avc: denied" messages you are seeing indicate that
SELinux is not allowing the swap to be mounted.

It might be nice to find out where the command that mounts swap is and
exactly what it says.  I believe you can do this by:
# add "cd /etc/init.d" to the following --
---------------------------------------------
tod at tod-desktop:/etc/init.d$ grep "swapon" *
checkroot.sh:                   SWAPON_MESSAGES="$(swapon -a 2>/dev/null)"
checkroot.sh:                   swapon -a 2>/dev/null
mountall.sh:    # Execute swapon command again, in case we want to swap to
mountall.sh:            swapon -a -e
--------------------------------------------
# So we from the above see the swap command - it referenced fstab (-a) so:
--------------------------------------------
tod at tod-desktop:/etc/init.d$ cd ..
tod at tod-desktop:/etc$ cat fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    defaults        0       0
/dev/hda1       /               ext3    defaults,errors=remount-ro 0       1
/dev/hda2       none            swap    sw              0       0
/dev/hdc        /media/cdrom0   udf,iso9660 user,noauto     0       0
tod at tod-desktop:/etc$
------------------------------------------------
In your case (I am running Dapper right now) you will probably find
the swapon command in /etc/rc.sysinit.  My Fedora partition is hda5:
------------------------------------------------
tod at tod-desktop:/media/hda5/etc$ grep "swapon" rc.sysinit
action $"Enabling swap space: " swapon -a -e
tod at tod-desktop:/media/hda5/etc$
--------------------------------------------------
And the results seen in dmesg:
--------------------------------------------------
tod at tod-desktop:~$ dmesg | grep swap
[17179635.188000] Adding 1318456k swap on /dev/hda2.  Priority:-1
extents:1 across:1318456k
--------------------------------------------------
The command says use the defaults written in fstab and skip devices
that do not exist.

Then, when we know what is trying to be mounted we need to find out
why SELinux is not permitting the operation?!

I notice that the messages reference "blkid.tab.old".  You would
probably do well to find that file and check it's permissions and
context.

Good Hunting!

Tod