Bdtyktl

fdisk problem.

OS: linux centos 7

I used fdisk on a usb drive. It has hung and I haven't been able to kill it or get out of it.

As an additional problem, since then, in trying to remedy this problem, I physically removed other USB drives that showed up in /dev/. However, those still show in /dev/ even though are no longer physically attached.

Here is lsblk (I removed from this listing other devices that are listed)
lsblk

NAME                    MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT

sdf                       8:80   0   1.8T  0 disk 

└─sdf1                    8:81   0   1.8T  0 part 

sr0                      11:0    1  1024M  0 rom  

I made the choices below following the notes I made when a friend formatted another USB drive for me (same exact USB drive type). The intention is to format it as ext4.

Below is the set of choices (emboldened):

[root@linux18 ~]# fdisk /dev/sdf

Welcome to fdisk (util-linux 2.23.2).



Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

Command (m for help): **m**

Command action

   a   toggle a bootable flag

   b   edit bsd disklabel

   c   toggle the dos compatibility flag

   d   delete a partition

   g   create a new empty GPT partition table

   G   create an IRIX (SGI) partition table

   l   list known partition types

   m   print this menu

   n   add a new partition

   o   create a new empty DOS partition table

   p   print the partition table

   q   quit without saving changes

   s   create a new empty Sun disklabel

   t   change a partition's system id

   u   change display/entry units

   v   verify the partition table

   w   write table to disk and exit

   x   extra functionality (experts only)



Command (m for help): **d**

Selected partition 1

Partition 1 is deleted



Command (m for help): **n**

Partition type:

   p   primary (0 primary, 0 extended, 4 free)

   e   extended

Select (default p): p

Partition number (1-4, default 1): 

First sector (2048-3906963455, default 2048): 

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-3906963455, default 3906963455): 

Using default value 3906963455

Partition 1 of type Linux and of size 1.8 TiB is set



Command (m for help): **t**

Selected partition 1

Hex code (type L to list all codes): 83

Changed type of partition 'Linux' to 'Linux'



Command (m for help): **w**

The partition table has been altered!

Here I tried both Control C and Control Z:

^[[B^[[B^[[B



^[[6~



^C^[[5~

This seem so be analogous to the problem you were facing: https://access.redhat.com/solutions/369623

Maybe try # dmsetup remove with some of the flag in the man page (--force --deferred --retry)