BUG 801763 - freed kmem modified on log mount failure

[pv@xxxxxxxxxxxxx (dxm@xxxxxxxxxxxx)]

View Incident: 
http://co-op.engr.sgi.com/BugWorks/code/bwxquery.cgi?search=Search&wlong=1&view_type=Bug&wi=801763

Submitter : dxm                       Submitter Domain : engr               
Assigned Engineer : dxm               Assigned Domain : engr                
Assigned Group : ptg                  Category : software                   
Customer Reported : F                 Priority : 2                          
Project : xfs                         Status : open                         
Description :
On log mount failure, xfs_log_mount follows this
code path:

        xfs_log_mount
                xlog_alloc_log
                xlog_recover (fails)
                xlog_unalloc_log
                set bit in log->l_flags

where the bit is set in the log structure which has
just been freed.

This bug could potentially corrupt data, but is
presumably infrequently excercised, hence the priority.

This bug is also present in linux-xfs.