UBIFS failure & stable page writes

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

Ok thanks, meanwhile we have applied the 'double free' patches in our nightly build and coming week I hope to have more information on this.

-----Original Message-----
From: Adrian Hunter [mailto:adrian.hunter at intel.com] 
Sent: dinsdag 18 juni 2013 9:01
To: Prins Anton (ST-CO/ENG1.1)
Cc: Mats Kärrman; linux-mtd at lists.infradead.org; dedekind1 at gmail.com
Subject: Re: UBIFS failure & stable page writes

On 18/06/13 09:31, Prins Anton (ST-CO/ENG1.1) wrote:
> 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?

I am afraid I have not had time to analyze the effects of the double-free
but it is reasonable to assume that UBIFS may be writing an orphan from a
structure that has been freed and therefore re-used by, for example in this
case, a spinlock.