UBIFS failure & stable page writes

[Prins Anton (ST-CO/ENG1.1)]

Last night I did do additional tests with create/remove of files in a while loop on a synchronous mounted UBIFS.
I did NOT get any node 0 or 1 written over this night, but obvious enough I saw some strange node id in the orphan area: 0xdead4ead

0xdead4ead Is known to me as SPINLOCK_MAGIC; but no glue why It is in the orphan area if node number...
Is something known about 0xdead4ead?