Hey Martin, thank you for the report!

Could you try if using directly the mkfs command is working?
$ sudo mkfs.vfat -I -n label /dev/sdc

I guess you checked the journal for clues?

The command you provided works fine on my hirsute system to format an
usb key in vfat, I'm not sure if the type of device could make a
difference there...

** Changed in: udisks2 (Ubuntu)
       Status: New => Incomplete

** Bug watch added: github.com/storaged-project/udisks/issues #851
   https://github.com/storaged-project/udisks/issues/851

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https://bugs.launchpad.net/bugs/1925822

Title:
  [21.04 regression] formatting vfat times out

Status in udisks2 package in Ubuntu:
  Incomplete

Bug description:
  There is a regression somewhere between udisks, udev, and dosfstools.
  Formatting a device with vfat hangs and fails:

  # blkid -p /dev/sda
  (nothing)

  # busctl call org.freedesktop.UDisks2 
/org/freedesktop/UDisks2/block_devices/sda org.freedesktop.UDisks2.Block Format 
'sa{sv}' vfat 0
  (long pause)
  Call failed: Error synchronizing after formatting with type `vfat': Timed out 
waiting for object

  # blkid -p /dev/sda
  /dev/sda: PTUUID="3690494f" PTTYPE="dos"

  OTOH, formatting as ext4 works fine:

  # wipefs -a /dev/sda; wipefs -a /dev/sda
  # busctl call org.freedesktop.UDisks2 
/org/freedesktop/UDisks2/block_devices/sda org.freedesktop.UDisks2.Block Format 
'sa{sv}' ext4 0
  (immediately succeeds)

  # blkid -p /dev/sda
  /dev/sda: UUID="8bea7475-6af5-4835-86d0-0e5b2cb5500e" VERSION="1.0" 
BLOCK_SIZE="4096" TYPE="ext4" USAGE="filesystem"

  I tested this to a QEMU emulated disk, but it reproduces equally well
  against a `modprobe scsi_debug` device.

  Package: udisks2 2.9.2-1
  DistroRelease: Ubuntu 21.04

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