BUG #5420: pg_attribute broken

The following bug has been logged online:

Bug reference:      5420
Logged by:          cool
Email address:      coolshower2008@yahoo.co.jp
PostgreSQL version: 8.1.8
Operating system:   debian 2.6.18-6-686
Description:        pg_attribute broken
Details:

We use PostgreSQL Databse on Hospital Information System in Japan.
In case of normal condition(Not busy, Not Backup, Not Start up and Not
Shutdown),
Suddenly, PostgreSQL outputs error message  and "pg_attribute" catalog file
is broken as bellow.
Could you sent it to us A.S.A.P.
<Environment>
   debian debian 2.6.18-6-686 / PostgreSQL 8.1.8
<Error message>
   invalid attribute number 0 for tbl_syuday
<pg_attribute>
     attrelid     addname           atttypid    attstattarget   attlen
attnum
     45762        tableoid          26          0               4
-7
     45762        cmax              29          0               4
-6
     45762        xmax              28          0               4
-5
     45762        cmin              29          0               4
-4
     45762        xmin              28          0               4
-3
     45762        ctid              27          0               6
-1
     45762        santeiflg18_4      0          0               0
0 (?)
     45762        nyugaikbn       1042         -1              -1
1
     45762        ptid            1700         -1              -1
2
     .
     .(Omission)
     .
     45762        santeiflg17_1   1700         -1              -1
343
     45762        ftmoney17_1     1700         -1              -1
344
     45762        ftmoney18_4     1700         -1              -1
380 (345..379 are deleted?)
     45762        comptfn18_4     1700         -1              -1
381
     .
     .(Omission)
     .
Q1:Does anything have same reports ?
Q2:Does anything have repair patches ?