kern/40764: fsck says "unrecognised wapbl type" after crash

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>Number:         40764
>Category:       kern
>Synopsis:       fsck says "unrecognised wapbl type" after crash
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Feb 27 08:50:00 +0000 2009
>Originator:     Alan Barrett
>Release:        NetBSD 5.99.7
>Organization:
Not much
>Environment:
System: NetBSD 5.99.7 i386
>Description:
After a crash, fsck has the following complaint about a file
system that was in active use at the time of the crash:

    fsck -f -y -P /dev/rcgd2a
    ** /dev/rcgd2a
    ** File system is journaled; replaying journal
    Unrecognized wapbl type: 0x00000000
    UNABLE TO READ JOURNAL FOR REPLAY
    CONTINUE? yes

>How-To-Repeat:
The system was (and still is) running NetBSD-current/i386, built from
sources as of 2009-02-22 20:15 UTC.  (That time is a few minutes before
the removal of softdep.)

The file system was mounted with "mount_ffs -o log".  The file system
was in active use by an rsync process performing a backup from another
file system.  The system crashed, for reasons unknown (I was unble
to get into ddb, and there is no crash dump).  After the crash, fsck
reported the problem described above.

>Fix:
Unknown