Re: Swap still not activated on later kernels

[Sreyan Chakravarty]

Thank you.

It works now after setting the correct parameters.

Thanks again.
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Re: Swap still not activated on later kernels

[Samuel Sieb]

On 11/13/20 9:35 PM, Tim via users wrote:

On Fri, 2020-11-13 at 13:16 -0500, Jonathan Billings wrote:

 In principle the location of a swap file’s header may be
 determined with the help of appropriate filesystem
 driver. Unfortunately, however, it requires the filesystem holding
 the swap file to be mounted, and if this filesystem is journaled,
 it cannot be mounted during resume from disk. For this reason to
 identify a swap file swsusp uses the name of the partition that
 holds the file and the offset from the beginning of the partition
 at which the swap file’s header is located. For convenience, this
 offset is expressed in  units.


Surely the absolute position of any file in a file system couldn't be
relied upon to always be the same?


Of course it can.  How is it going to move around?
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Re: Swap still not activated on later kernels

[Tim via users]

On Fri, 2020-11-13 at 13:16 -0500, Jonathan Billings wrote:
> In principle the location of a swap file’s header may be
> determined with the help of appropriate filesystem
> driver. Unfortunately, however, it requires the filesystem holding
> the swap file to be mounted, and if this filesystem is journaled,
> it cannot be mounted during resume from disk. For this reason to
> identify a swap file swsusp uses the name of the partition that
> holds the file and the offset from the beginning of the partition
> at which the swap file’s header is located. For convenience, this
> offset is expressed in  units.

Surely the absolute position of any file in a file system couldn't be
relied upon to always be the same?

-- 
 
uname -rsvp
Linux 3.10.0-1160.2.2.el7.x86_64 #1 SMP Tue Oct 20 16:53:08 UTC 2020 x86_64
 
Boilerplate:  All unexpected mail to my mailbox is automatically deleted.
I will only get to see the messages that are posted to the mailing list.
 
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Re: Swap still not activated on later kernels

[Chris Murphy]

On Fri, Nov 13, 2020 at 5:41 AM Sreyan Chakravarty  wrote:

> 1) Why doesn't fallocate work anymore ?

Fallocate is the preferred way to do this, e.g.

fallocate -l 8G swapfile

> 2) I trieddd if=/dev/zero of=/fedora.swap bs=1 count=0 seek=8G
>
> This did not work. swapon complained about files being full of holes.

That's because that command creates a sparse file, which has holes in
it. Same as using 'truncate'.

> What is so special about bs=1M ?

I think it's count=0 and seek= that causes it to become sparse. I
don't think the bs size is relevant.

> /fedora.swap none swap sw 0 0

I have no idea what 'sw' is in the fstab file is for; I don't see it
in either man fstab or man swapon. I'd just make this line:

/fedora.swap none defaults



>
>
> I now have a new problem.
>
> SELinux is preventing systemd-logind to read the swap file.
>
> Here is the message:
>
> SELinux is preventing systemd-logind from read access on the file 
> /fedora.swap.

mkswap sets the label. So this is a secondary effect of what Sam Sieb
already discovered from the lack of a blkid swap signature. You forgot
to use mkswap on the file.




-- 
Chris Murphy
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Re: Swap still not activated on later kernels

[Samuel Sieb]

On 11/13/20 2:18 AM, Sreyan Chakravarty wrote:

$ blkid /fedora.swap
(No Output)


This means that you didn't use "mkswap" to format the file as swap.
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Re: Swap still not activated on later kernels

[Bob Marcan]

On Fri, 13 Nov 2020 13:16:05 -0500
Jonathan Billings  wrote:


> 
> 2) Use an application that will bmap the swap file with the help
> of the FIBMAP ioctl and determine the location of the file’s swap
> header, as the offset, in  units, from the beginning of
> the partition which holds the swap file. 
> 
> 3) Add the following parameters to the kernel command line:
> 

Use an application that will bmap the swap file with the help

Does this application already exists or we need to write one? ;-)
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Re: Swap still not activated on later kernels

[Jonathan Billings]

On Fri, Nov 13, 2020 at 05:44:57PM +, Patrick O'Callaghan wrote:
> 
> It's been years since I did this so things may have changed (I don't
> use hibernation as it doesn't work with GPU passthrough for VMs), but
> in my notes it says to add the UUID of the swap device to the command
> line in /etc/sysconfig/grub:
> 
> GRUB_CMDLINE_LINUX="... resume=UUID= ..."
>  
> and then run 'grub2-mkconfig' to do its magic. I'm not sure if this can
> be adapted to using a swapfile, but something tells me it can't. It has
> to be a device or partition unless things have changed. I'm sure more
> experienced hands will correct this if I'm wrong.

There are extra steps if you use a swap file, instead of a swap
partition.

According to the kernel documentation:
https://www.kernel.org/doc/html/latest/power/swsusp-and-swap-files.html

The Linux kernel handles swap files almost in the same way as it
handles swap partitions and there are only two differences between
these two types of swap areas: (1) swap files need not be
contiguous, (2) the header of a swap file is not in the first
block of the partition that holds it. From the swsusp’s point of
view (1) is not a problem, because it is already taken care of by
the swap-handling code, but (2) has to be taken into
consideration.

In principle the location of a swap file’s header may be
determined with the help of appropriate filesystem
driver. Unfortunately, however, it requires the filesystem holding
the swap file to be mounted, and if this filesystem is journaled,
it cannot be mounted during resume from disk. For this reason to
identify a swap file swsusp uses the name of the partition that
holds the file and the offset from the beginning of the partition
at which the swap file’s header is located. For convenience, this
offset is expressed in  units.

In order to use a swap file with swsusp, you need to:

1) Create the swap file and make it active, eg.:

# dd if=/dev/zero of= bs=1024 count=
# mkswap 
# swapon 


2) Use an application that will bmap the swap file with the help
of the FIBMAP ioctl and determine the location of the file’s swap
header, as the offset, in  units, from the beginning of
the partition which holds the swap file. 

3) Add the following parameters to the kernel command line:

resume= resume_offset=

where  is the partition on which the swap
file is located and  is the offset of the swap
header determined by the application in 2) (of course, this step
may be carried out automatically by the same application that
determines the swap file’s header offset using the FIBMAP ioctl)

-- 
Jonathan Billings 
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Re: Swap still not activated on later kernels

[Patrick O'Callaghan]

On Fri, 2020-11-13 at 20:22 +0530, Sreyan Chakravarty wrote:
> $  systemctl hibernate
> Failed to hibernate system via logind: Not enough swap space for
> hibernation
> 
> I don't understand why after having 8GB of free swap space, I am
> still
> unable to hibernate ?
> 
> Is this an SELinux issue ?
> 
> What is the problem here ?

It's been years since I did this so things may have changed (I don't
use hibernation as it doesn't work with GPU passthrough for VMs), but
in my notes it says to add the UUID of the swap device to the command
line in /etc/sysconfig/grub:

GRUB_CMDLINE_LINUX="... resume=UUID= ..."
 
and then run 'grub2-mkconfig' to do its magic. I'm not sure if this can
be adapted to using a swapfile, but something tells me it can't. It has
to be a device or partition unless things have changed. I'm sure more
experienced hands will correct this if I'm wrong.

poc
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Re: Swap still not activated on later kernels

[Sreyan Chakravarty]

On Fri, Nov 13, 2020 at 6:28 PM Sreyan Chakravarty 
wrote:

>
>
> On Fri, Nov 13, 2020 at 3:58 PM Ed Greshko  wrote:
>
>> Looking at https://bbs.archlinux.org/viewtopic.php?id=256614 and the
>> URL's contained within
>> it seems doing a
>>
>> dd if=/dev/zero of=/fedora.swap bs=1M count=2048 status=progress
>>
>> may cure the w(hole) issue.  :-)
>>
>>
> Also weirdly my 8GB swap file is being interpreted as only 8MB.
>
> $  swapon -s
> FilenameTypeSizeUsed
>  Priority
> /fedora.swapfile8388604 0   -2
>
> $   ls -sh /fedora.swap
> 8.1G /fedora.swap
>
> What on earth is happening?
>

Ok my mistake.

I seem to have 8 GB of swap space. I can confirm by the free command.

$ free -h
  totalusedfree  shared  buff/cache
available
Mem:  7.7Gi   1.7Gi   4.4Gi   337Mi   1.6Gi
5.4Gi
Swap: 8.0Gi  0B   8.0Gi


BUT

I am still unable to hibernate:

$  systemctl hibernate
Failed to hibernate system via logind: Not enough swap space for hibernation

I don't understand why after having 8GB of free swap space, I am still
unable to hibernate ?

Is this an SELinux issue ?

What is the problem here ?
-- 
Regards,
Sreyan Chakravarty
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Re: Swap still not activated on later kernels

[Sreyan Chakravarty]

On Fri, Nov 13, 2020 at 3:58 PM Ed Greshko  wrote:

> Looking at https://bbs.archlinux.org/viewtopic.php?id=256614 and the
> URL's contained within
> it seems doing a
>
> dd if=/dev/zero of=/fedora.swap bs=1M count=2048 status=progress
>
> may cure the w(hole) issue.  :-)
>
>
Also weirdly my 8GB swap file is being interpreted as only 8MB.

$  swapon -s
FilenameTypeSizeUsed
 Priority
/fedora.swapfile8388604 0   -2

$   ls -sh /fedora.swap
8.1G /fedora.swap

What on earth is happening?

-- 
Regards,
Sreyan Chakravarty
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Re: Swap still not activated on later kernels

[Sreyan Chakravarty]

On Fri, Nov 13, 2020 at 4:00 PM Ed Greshko  wrote:

> > Looking at https://bbs.archlinux.org/viewtopic.php?id=256614 and the
> URL's contained within
> > it seems doing a
> >
> > dd if=/dev/zero of=/fedora.swap bs=1M count=2048 status=progress
> >
> > may cure the w(hole) issue.  :-)
> >
>
> Sorry, the count above was for a 2GB swap file.  Increase it to cover your
> 8GB file.
>
>
dd if=/dev/zero of=/fedora.swap bs=1M count=8192 status=progress

This command has partially solved my problem

But I have a couple of questions,

1) Why doesn't fallocate work anymore ?
2) I trieddd if=/dev/zero of=/fedora.swap bs=1 count=0 seek=8G

This did not work. swapon complained about files being full of holes.
What is so special about bs=1M ?


I now have a new problem.

SELinux is preventing systemd-logind to read the swap file.

Here is the message:

SELinux is preventing systemd-logind from read access on the file
/fedora.swap.

*  Plugin restorecon (99.5 confidence) suggests


If you want to fix the label.
/fedora.swap default label should be etc_runtime_t.
Then you can run restorecon. The access attempt may have been stopped due
to insufficient permissions to access a parent directory in which case try
to change the following command accordingly.
Do
# /sbin/restorecon -v /fedora.swap

*  Plugin catchall (1.49 confidence) suggests
**

If you believe that systemd-logind should be allowed read access on the
fedora.swap file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'systemd-logind' --raw | audit2allow -M my-systemdlogind
# semodule -X 300 -i my-systemdlogind.pp

Additional Information:
Source Contextsystem_u:system_r:systemd_logind_t:s0
Target Contextunconfined_u:object_r:swapfile_t:s0
Target Objects/fedora.swap [ file ]
Sourcesystemd-logind
Source Path   systemd-logind
Port  
Host  localhost.HPNotebook
Source RPM Packages
Target RPM Packages
SELinux Policy RPMselinux-policy-targeted-3.14.5-44.fc32.noarch
Local Policy RPM  selinux-policy-targeted-3.14.5-44.fc32.noarch
Selinux Enabled   True
Policy Type   targeted
Enforcing ModeEnforcing
Host Name localhost.HPNotebook
Platform  Linux localhost.HPNotebook
5.8.18-200.fc32.x86_64
  #1 SMP Mon Nov 2 19:49:11 UTC 2020 x86_64
x86_64
Alert Count   3
First Seen2020-11-13 17:59:22 IST
Last Seen 2020-11-13 17:59:22 IST
Local ID  375aec7e-f77d-47ab-865a-f83a47c12423

Raw Audit Messages
type=AVC msg=audit(1605270562.371:320): avc:  denied  { read } for
 pid=1256 comm="systemd-logind" name="fedora.swap" dev="dm-2" ino=13
scontext=system_u:system_r:systemd_logind_t:s0
tcontext=unconfined_u:object_r:swapfile_t:s0 tclass=file permissive=0


Hash: systemd-logind,systemd_logind_t,swapfile_t,file,read


I don't know much about SELinux, can you help me fix the label ?

How can I fix the label as described here?

If you want to fix the label.
/fedora.swap default label should be etc_runtime_t.


-- 
Regards,
Sreyan Chakravarty
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Re: Swap still not activated on later kernels

[Ed Greshko]

On 13/11/2020 18:27, Ed Greshko wrote:

On 13/11/2020 18:18, Sreyan Chakravarty wrote:



On Fri, Nov 13, 2020 at 12:31 PM Samuel Sieb mailto:sam...@sieb.net>> wrote:

    What do "ls -lh /fedora.swap", "du -h /fedora.swap", and "blkid
    /fedora.swap" show?


This is the requested data:

$ ls -lh /fedora.swap
-rw---. 1 root root 8.0G Nov 13 15:36 /fedora.swap

$ du -h /fedora.swap
8.1G    /fedora.swap

$ blkid /fedora.swap
(No Output)

    Didn't you have a similar problem a while ago or was that someone else?


I had the same problem with the 5.7 kernel, and my solution was to use the 5.6 
kernel.

    There was some kernel change that might require you to recreate the swap
    file.


 I have created the swap but they still get the same error.

    Nov 13 15:39:33 localhost.HPNotebook kernel: swapon: swapfile has 
holes

Anything else I can do ?


Looking at https://bbs.archlinux.org/viewtopic.php?id=256614 and the URL's 
contained within
it seems doing a

dd if=/dev/zero of=/fedora.swap bs=1M count=2048 status=progress

may cure the w(hole) issue.  :-)



Sorry, the count above was for a 2GB swap file.  Increase it to cover your 8GB 
file.

---
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Re: Swap still not activated on later kernels

[Ed Greshko]

On 13/11/2020 18:18, Sreyan Chakravarty wrote:



On Fri, Nov 13, 2020 at 12:31 PM Samuel Sieb mailto:sam...@sieb.net>> wrote:

What do "ls -lh /fedora.swap", "du -h /fedora.swap", and "blkid
/fedora.swap" show?


This is the requested data:

$ ls -lh /fedora.swap
-rw---. 1 root root 8.0G Nov 13 15:36 /fedora.swap

$ du -h /fedora.swap
8.1G    /fedora.swap

$ blkid /fedora.swap
(No Output)

Didn't you have a similar problem a while ago or was that someone else?


I had the same problem with the 5.7 kernel, and my solution was to use the 5.6 
kernel.

There was some kernel change that might require you to recreate the swap
file.


 I have created the swap but they still get the same error.

    Nov 13 15:39:33 localhost.HPNotebook kernel: swapon: swapfile has 
holes

Anything else I can do ?


Looking at https://bbs.archlinux.org/viewtopic.php?id=256614 and the URL's 
contained within
it seems doing a

dd if=/dev/zero of=/fedora.swap bs=1M count=2048 status=progress

may cure the w(hole) issue.  :-)

---
The key to getting good answers is to ask good questions.
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Re: Swap still not activated on later kernels

[Sreyan Chakravarty]

On Fri, Nov 13, 2020 at 12:31 PM Samuel Sieb  wrote:

> What do "ls -lh /fedora.swap", "du -h /fedora.swap", and "blkid
> /fedora.swap" show?
>

This is the requested data:

$ ls -lh /fedora.swap
-rw---. 1 root root 8.0G Nov 13 15:36 /fedora.swap

$ du -h /fedora.swap
8.1G/fedora.swap

$ blkid /fedora.swap
(No Output)

Didn't you have a similar problem a while ago or was that someone else?
>

I had the same problem with the 5.7 kernel, and my solution was to use the
5.6 kernel.

There was some kernel change that might require you to recreate the swap
> file.


 I have created the swap but they still get the same error.

Nov 13 15:39:33 localhost.HPNotebook kernel: swapon: swapfile
has holes

Anything else I can do ?
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Re: Swap still not activated on later kernels

[Samuel Sieb]

On 11/12/20 10:42 PM, Sreyan Chakravarty wrote:



On Thu, Nov 12, 2020 at 11:45 AM Samuel Sieb > wrote:


Is there an error message?
What is the line in your /etc/fstab?
What happens if you do "swapon /path/to/your/swapfile"?


No idea why this is happening though:

swapon /fedora.swap
swapon: /fedora.swap: swapon failed: Invalid argument


What do "ls -lh /fedora.swap", "du -h /fedora.swap", and "blkid 
/fedora.swap" show?

Didn't you have a similar problem a while ago or was that someone else?
There was some kernel change that might require you to recreate the swap 
file.

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Re: Swap still not activated on later kernels

[Sreyan Chakravarty]

On Thu, Nov 12, 2020 at 11:45 AM Samuel Sieb  wrote:

> What is the line in your /etc/fstab?
>

My /etc/fstab has the following:

/dev/mapper/vgfedora-fedora /   ext4
 defaults,x-systemd.device-timeout=0 1 1
UUID=4d112d8e-080d-44f2-8962-9c13f20a7885 /boot   ext4
 defaults1 2
UUID=041A-E511  /boot/efi   vfat
 defaults,uid=0,gid=0,umask=077,shortname=winnt 0 2
/fedora.swap none swap sw 0 0

-- 
Regards,
Sreyan Chakravarty
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Re: Swap still not activated on later kernels

[Sreyan Chakravarty]

On Thu, Nov 12, 2020 at 11:45 AM Samuel Sieb  wrote:


> Is there an error message?
> What is the line in your /etc/fstab?
> What happens if you do "swapon /path/to/your/swapfile"?
>

No idea why this is happening though:

swapon /fedora.swap
swapon: /fedora.swap: swapon failed: Invalid argument


I am getting the following error message during boot

$ journalctl -b 0

Nov 13 11:55:46 localhost.HPNotebook systemd[1]: Activating swap
/fedora.swap...
Nov 13 11:56:01 localhost.HPNotebook swapon[1018]: swapon: /fedora.swap:
swapon failed: Invalid argument
Nov 13 11:55:46 localhost.HPNotebook systemd[1]: fedora.swap.swap: Swap
process exited, code=exited, status=255/EXCEPTION
Nov 13 11:55:46 localhost.HPNotebook systemd[1]: fedora.swap.swap: Failed
with result 'exit-code'.
Nov 13 11:55:46 localhost.HPNotebook systemd[1]: Failed to activate swap
/fedora.swap.
Nov 13 11:56:01 localhost.HPNotebook swapon[1104]: swapon: /fedora.swap:
swapon failed: Invalid argument
Nov 13 11:56:00 localhost.HPNotebook systemd[1]: Activating swap
/fedora.swap...
Nov 13 11:56:01 localhost.HPNotebook systemd[1]: fedora.swap.swap: Swap
process exited, code=exited, status=255/EXCEPTION
Nov 13 11:56:01 localhost.HPNotebook systemd[1]: fedora.swap.swap: Failed
with result 'exit-code'.
Nov 13 11:56:01 localhost.HPNotebook systemd[1]: Failed to activate swap
/fedora.swap.
Nov 13 11:56:02 localhost.HPNotebook systemd[1]: Activating swap
/fedora.swap...
Nov 13 11:56:02 localhost.HPNotebook swapon[1122]: swapon: /fedora.swap:
swapon failed: Invalid argument
Nov 13 11:56:02 localhost.HPNotebook systemd[1]: fedora.swap.swap: Swap
process exited, code=exited, status=255/EXCEPTION
Nov 13 11:56:02 localhost.HPNotebook systemd[1]: fedora.swap.swap: Failed
with result 'exit-code'.
Nov 13 11:56:02 localhost.HPNotebook systemd[1]: Failed to activate swap
/fedora.swap.


I can confirm that swap does not work as :

$ free

  totalusedfree  shared  buff/cache
available
Mem:8041504 1887468 4029028  321996 2125008
5525636
Swap: 0   0   0

Free gives 0 swap, and my hibernate option is disabled.


-- 
Regards,
Sreyan Chakravarty
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Re: Swap still not activated on later kernels

[Samuel Sieb]

On 11/11/20 10:04 PM, Sreyan Chakravarty wrote:

The bug still persists.

I am on Fedora 32 and just upgraded to the latest 5.8 kernel.

I am still getting the error of my swap file being failed to be 
activated, and as a result I have no swap space after boot.


Is there an error message?
What is the line in your /etc/fstab?
What happens if you do "swapon /path/to/your/swapfile"?
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Swap still not activated on later kernels

[Sreyan Chakravarty]

The bug still persists.

I am on Fedora 32 and just upgraded to the latest 5.8 kernel.

I am still getting the error of my swap file being failed to be activated,
and as a result I have no swap space after boot.

I use a swap file and not a swap partition.

This problem is carried over from the 5.7 kernel, I reported it over here.
It still exists in the 5.8 kernel.

How do I activate my swap file ?

Is there some sort of work around ?

-- 
Regards,
Sreyan Chakravarty
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