[udev regression] Opening LUKS device fails

Since yesterday, udisks2's Luks tests (https://jenkins.qa.ubuntu.com/job/vivid-adt-udisks2/?) fail:

======================================================================
ERROR: test_0_create_teardown (__main__.Luks)
LUKS create/teardown
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Traceback (most recent call last):
  File "src/tests/integration-test", line 1141, in test_0_create_teardown
    'label': GLib.Variant('s', 'treasure')}))
  File "src/tests/integration-test", line 314, in fs_create
    block.call_format_sync(type, options, None)
GLib.Error: udisks-error-quark: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error opening LUKS device: Command-line `cryptsetup luksOpen ""/dev/sda"" luks-669be693-dc38-499c-911b-19df1540f70c' exited with non-zero exit status 1: device-mapper: reload ioctl on failed: Invalid argument
Failed to open temporary keystore device.
device-mapper: remove ioctl on temporary-cryptsetup-18309 failed: No such device or address
device-mapper: reload ioctl on temporary-cryptsetup-18309 failed: No such device or address
device-mapper: remove ioctl on temporary-cryptsetup-18309 failed: No such device or address
device-mapper: remove ioctl on temporary-cryptsetup-18309 failed: No such device or address
device-mapper: remove ioctl on temporary-cryptsetup-18309 failed: No such device or address
device-mapper: remove ioctl on temporary-cryptsetup-18309 failed: No such device or address
 (0)

This test also fails locally for me. This still worked on Dec 18 on my system.

Simple reproducer:

sudo modprobe scsi_debug
gdbus call -y -d org.freedesktop.UDisks2 -o /org/freedesktop/UDisks2/block_devices/sdb -m org.freedesktop.UDisks2.Block.Format 'ext2' '{"encrypt.passphrase": <"foo">}'