Forgot to mention, there is nothing useful in the journal. The only
message is this when the timeout happens:

Apr 23 15:12:35 ubuntu udisksd[3116]: Error synchronizing after
formatting with type `vfat': Timed out waiting for object


** Description changed:

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

Title:
  [21.04 regression] formatting vfat times out

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