Alright, it's an incompatibility issue with dosfstools 4.2, downgrading to 4.1 fixes the issue.
Checking upstream the issue was fixed by https://github.com/storaged- project/udisks/commit/ef1979d8 which I've backported now and verify is working SRU is in the hirsute queue ** Description changed: + * Impact + + Formatting devices to vfat fails in some cases due to an incompatibility + with the new dosfstools version + + * Test case + + see comment #5 + + or + + - $ sudo modprobe scsi_debug + - check what device is assigned + - $ sudo busctl call org.freedesktop.UDisks2 /org/freedesktop/UDisks2/block_devices/DEVNAME org.freedesktop.UDisks2.Block Format 'sa{sv}' vfat 0 + (replace DEVNAME by the actual device name, 'sdc' for example) + + the formatting should work which you can verify by + - $ blkid -p /dev/DEVNAME + + * Regression potential + + The changes is specific to vfat handling so that's the feature to focus + on while testing, make sure than creating, deleting, renaming vfat + partitions from gnome-disks is working. + + ---------------------------- + + 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 ** Changed in: udisks2 (Ubuntu) Assignee: (unassigned) => Sebastien Bacher (seb128) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1925822 Title: [21.04 regression] formatting vfat times out To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/udisks2/+bug/1925822/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
