Problems starting up postgres

Hello, 
I have quite strange problem. Postgres refuses to start. 
This is 7.1.2. Actually this is Aug 15 snapshot of REL7_1_STABLE branch. 
This is what should be 7.1.2. Any ideas how to repair data? 
This is quite urgent. The system is live, and now stopped. 
Sep  5 08:42:30 mx postgres[5341]: [1] DEBUG:  database system shutdown was interrupted at 2001-09-05 08:26:25 EDT 
Sep  5 08:42:30 mx postgres[5341]: [2] DEBUG:  CheckPoint record at (23, 2431142676) 
Sep  5 08:42:30 mx postgres[5341]: [3] DEBUG:  Redo record at (23, 2431142676); Undo record at (0, 0); Shutdown TRUE 
Sep  5 08:42:30 mx postgres[5341]: [4] DEBUG:  NextTransactionId: 13932307; NextOid: 9127687 
Sep  5 08:42:30 mx postgres[5341]: [5] DEBUG:  database system was not properly shut down; automatic recovery in
progress...
 
Sep  5 08:42:30 mx postgres[5341]: [6] DEBUG:  redo starts at (23, 2431142740) 
Sep  5 08:42:30 mx postgres[5341]: [7] DEBUG:  ReadRecord: record with zero len at (23, 2432317444) 
Sep  5 08:42:30 mx postgres[5341]: [8] DEBUG:  redo done at (23, 2432317408) 
Sep  5 08:42:30 mx postgres[5341]: [9] FATAL 2:  XLogFlush: request is not satisfied 
Sep  5 08:44:42 mx postgres[5441]: [1] DEBUG:  database system shutdown was interrupted at 2001-09-05 08:42:30 EDT 
Sep  5 08:44:42 mx postgres[5441]: [2] DEBUG:  CheckPoint record at (23, 2431142676) 
--  
Sincerely Yours, 
Denis Perchine 
---------------------------------- 
E-Mail: dyp@perchine.com 
HomePage: http://www.perchine.com/dyp/ 
FidoNet: 2:5000/120.5 
----------------------------------