MySQL Bugs: #39458: Wrong page type during recovery

Bug #39458	Wrong page type during recovery
Submitted:	15 Sep 2008 18:35	Modified:	7 Oct 2008 18:27
Reporter:	Ann Harrison	Email Updates:
Status:	Can't repeat	Impact on me:	None
Category:	MySQL Server: Falcon storage engine	Severity:	S2 (Serious)
Version:		OS:	Any
Assigned to:		CPU Architecture:	Any
Tags:	F_PAGE IO

Description:
Under some circumstances, a Falcon recovery fails with this
message:

bzr+ssh://aharrison@bk-internal.mysql.com/bzrroot/server/mysql-6.0-falcon-team

How to repeat:
I don't know

Message was Bugcheck: wrong page type, expected 5 found 9

Ann, would you say that all errors of the type

Bugcheck: page XXX/0 wrong page type, expected YYY got ZZZ

are the same bug, or it matters what numbers XXX , YYY and ZZZ are?

Maybe related to the bug: http://bugs.mysql.com/bug.php?id=36436?.

Ann, There is a testcase in http://bugs.mysql.com/bug.php?id=36436 that caused this problem for Philip for a while on certain builds.  Is it similar to how you are getting this error?

It could be the same.  Both cases I have found a page of type 9, which
is a data overflow.  One expected a data page, one expected an index
page.  Until I know what's gone wrong, I won't know whether that's the
same as the bug Philip registered.  The behavior is consistently reproducible
with the log and data files, but producing it from a working database is
not consistent.

Ann, Can you attach a link to the bug reproducing log and data files?

Ann, Please set to Open or Verified once you have attached these files.

Ann, is this wrong page type problem fixed now that the recent cache changes have been backed out?

After the changes to the Cache::flush method were reverted by 
Chris, this problem no longer occurs.