Re: losetup: cannot find an unused loop device , kernel config of loopback device
> ----------------------------------------------------------------------
>
> Do you have a file
> /dev/loop-control
> ?
>
> What is listed by
>
> ls -ld /dev/loop*
>
colin@M00974055-VM:~$ sudo ls /dev/loop-control
[sudo] password for colin:
ls: cannot access '/dev/loop-control': No such file or directory
colin@M00974055-VM:~$ sudo ls -ld /dev/loop*
ls: cannot access '/dev/loop*': No such file or directory
> ----------------------------------------------------------------------
>
> What happens if you try to create a loop device manually ?
>
not_yet_existing_file="some_file_path"
dd if=/dev/zero bs=512 count=2 of="$not_yet_existing_file"
sudo losetup loop0 "$not_yet_existing_file"
not_yet_existing_file="/tmp/does_not_exist_yet"
dd if=/dev/zero bs=512 count=2 of="$not_yet_existing_file"
sudo losetup loop0 "$not_yet_existing_file"
2+0 records in
2+0 records out
1024 bytes (1.0 kB, 1.0 KiB) copied, 0.000187826 s, 5.5 MB/s
losetup: /dev/loop0: failed to set up loop device: No such file or directory
> There should be no messages from losetup.
But we see one above ^^
> sudo wc -c </dev/loop0
> should yield "1024".
sudo wc -c </dev/loop0
bash: /dev/loop0: No such file or directory
> To clean up do:
>
losetup -d /dev/loop0
rm "$not_yet_existing_file"
colin@M00974055-VM:~$ sudo losetup -d /dev/loop0
losetup: /dev/loop0: failed to use device: No such device
colin@M00974055-VM:~$ rm "$not_yet_existing_file"
colin@M00974055-VM:~$
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>
>
> Have a nice day :)
>
> Thomas
Thank you Thomas. Thanks again for looking at my issue. Not sure where
to go from here.
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colin@M00974055-VM:~$ uname -r
5.10.0-3-amd64
colin@M00974055-VM:~$ cat /etc/debian_version
11.0colin@M00974055-VM:~$ lsmod | grep loop
colin@M00974055-VM:~$ sudo modprobe loop
colin@M00974055-VM:~$ lsmod | grep loop
loop 36864 0
colin@M00974055-VM:~$ dd if=/dev/zero bs=512 count=2 of="$not_yet_existing_file"
2+0 records in
2+0 records out
1024 bytes (1.0 kB, 1.0 KiB) copied, 0.000134838 s, 7.6 MB/s
colin@M00974055-VM:~$ sudo losetup loop0 "$not_yet_existing_file"
No error here ^^ Guess we needed to load the module?
colin@M00974055-VM:~$ sudo wc -c </dev/loop0
bash: /dev/loop0: Permission denied
colin@M00974055-VM:~$ sudo -i
root@M00974055-VM:~# wc -c </dev/loop0
1024
root@M00974055-VM:
wc -c </dev/loop0
1024
root@M00974055-VM:~# losetup -d /dev/loop0
rm "$not_yet_existing_file"
rm: cannot remove '': No such file or directory
I think we are on to something after loading the module
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I re-ran the script after the module. It looks like it's making more
progress but still getting an eventual error related to loopback
devices:
http://ix.io/3vi8
^^ This is probably the most useful to look at moving forward ^^
Now I will re-run the inital commands below
sudo ls -ld /dev/loop*
brw-rw---- 1 root disk 7, 0 Aug 7 13:07 /dev/loop0
brw-rw---- 1 root disk 259, 12 Aug 7 13:07 /dev/loop0p1
brw-rw---- 1 root disk 259, 21 Aug 7 13:07 /dev/loop0p10
brw-rw---- 1 root disk 259, 22 Aug 7 13:07 /dev/loop0p11
brw-rw---- 1 root disk 259, 23 Aug 7 13:07 /dev/loop0p12
brw-rw---- 1 root disk 259, 13 Aug 7 13:07 /dev/loop0p2
brw-rw---- 1 root disk 259, 14 Aug 7 13:07 /dev/loop0p3
brw-rw---- 1 root disk 259, 15 Aug 7 13:07 /dev/loop0p4
brw-rw---- 1 root disk 259, 16 Aug 7 13:07 /dev/loop0p5
brw-rw---- 1 root disk 259, 17 Aug 7 13:07 /dev/loop0p6
brw-rw---- 1 root disk 259, 18 Aug 7 13:07 /dev/loop0p7
brw-rw---- 1 root disk 259, 19 Aug 7 13:07 /dev/loop0p8
brw-rw---- 1 root disk 259, 20 Aug 7 13:07 /dev/loop0p9
brw-rw---- 1 root disk 7, 1 Aug 7 13:01 /dev/loop1
brw-rw---- 1 root disk 259, 0 Aug 7 13:01 /dev/loop1p1
brw-rw---- 1 root disk 259, 9 Aug 7 13:01 /dev/loop1p10
brw-rw---- 1 root disk 259, 10 Aug 7 13:01 /dev/loop1p11
brw-rw---- 1 root disk 259, 11 Aug 7 13:01 /dev/loop1p12
brw-rw---- 1 root disk 259, 1 Aug 7 13:01 /dev/loop1p2
brw-rw---- 1 root disk 259, 2 Aug 7 13:01 /dev/loop1p3
brw-rw---- 1 root disk 259, 3 Aug 7 13:01 /dev/loop1p4
brw-rw---- 1 root disk 259, 4 Aug 7 13:01 /dev/loop1p5
brw-rw---- 1 root disk 259, 5 Aug 7 13:01 /dev/loop1p6
brw-rw---- 1 root disk 259, 6 Aug 7 13:01 /dev/loop1p7
brw-rw---- 1 root disk 259, 7 Aug 7 13:01 /dev/loop1p8
brw-rw---- 1 root disk 259, 8 Aug 7 13:01 /dev/loop1p9
brw-rw---- 1 root disk 7, 2 Aug 7 13:09 /dev/loop2
brw-rw---- 1 root disk 259, 24 Aug 7 13:09 /dev/loop2p1
brw-rw---- 1 root disk 259, 33 Aug 7 13:09 /dev/loop2p10
brw-rw---- 1 root disk 259, 34 Aug 7 13:09 /dev/loop2p11
brw-rw---- 1 root disk 259, 35 Aug 7 13:09 /dev/loop2p12
brw-rw---- 1 root disk 259, 25 Aug 7 13:09 /dev/loop2p2
brw-rw---- 1 root disk 259, 26 Aug 7 13:09 /dev/loop2p3
brw-rw---- 1 root disk 259, 27 Aug 7 13:09 /dev/loop2p4
brw-rw---- 1 root disk 259, 28 Aug 7 13:09 /dev/loop2p5
brw-rw---- 1 root disk 259, 29 Aug 7 13:09 /dev/loop2p6
brw-rw---- 1 root disk 259, 30 Aug 7 13:09 /dev/loop2p7
brw-rw---- 1 root disk 259, 31 Aug 7 13:09 /dev/loop2p8
brw-rw---- 1 root disk 259, 32 Aug 7 13:09 /dev/loop2p9
brw-rw---- 1 root disk 7, 3 Aug 7 12:59 /dev/loop3
brw-rw---- 1 root disk 7, 4 Aug 7 12:59 /dev/loop4
brw-rw---- 1 root disk 7, 5 Aug 7 12:59 /dev/loop5
brw-rw---- 1 root disk 7, 6 Aug 7 12:59 /dev/loop6
brw-rw---- 1 root disk 7, 7 Aug 7 12:59 /dev/loop7
crw-rw---- 1 root disk 10, 237 Aug 7 12:59 /dev/loop-control
(cr) (feature/deb11-II) colin@M00974055-VM ~/chromiumos/src/scripts $
sudo ls /dev/loop-control
/dev/loop-control
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