[JFFS2] kernel BUG at fs/jffs2/readinode.c:252

[Manu Rao]

Hi all.
I have a kernel oops occurring at a point in /fs/jffs2/readinode.c on an
AT91 board /2.6.22 kernel/jffs2 Filesys on Samsung NAND flash.

Gdb led me to line 252:
		...
	while (this->overlapped)
            this = tn_prev(this);

      /* First node should never be marked overlapped */
      BUG_ON(!this);
      dbg_readinode("'this' found %#04x-%#04x (%s)\n",
		...

My problem occurs when 'this' becomes NULL. I have structured the loop
differently and that makes the OOPS go away, but I am concerned about
the actual cause for the OOPS. From what I can tell, the structure/flag
is in memory, and not in the flash.

What could cause this to happen? I am also not sure if the BUG_ON should
read BUG_ON(!this) or BUG_ON(!this->overlapped) as suggested by the
comment.

Any/All help appreciated.