postgrey rejects all emails

[psl]

Ubuntu 12.04.4 LTS, 64-bit
postgrey 1.34-1

postgrey regulary starts to reject all emails with action "greylisted". I checked log files and I see these strange messages there:

Mar 6 02:11:39 mda postgrey[1086]: cleaning up old logs...
Mar 6 02:11:40 mda postgrey[1086]: cleaning up old entries...
Mar 6 02:11:40 mda postgrey[1086]: WARNING: Argument "1391011722M-^W\0^A62.97.141.71/owner-nolist-mdirector-no..." isn't numeric in subtraction (-) at /usr/sbin/postgrey line 267.#012
...
...
Mar 6 03:11:39 mda postgrey[1086]: cleaning up old logs...
Mar 6 03:11:39 mda postgrey[1086]: WARNING: can't checkpoint !? PANIC: fatal region error detected; run recovery at /usr/sbin/postgrey line 237.#012

This is critical bug from my point of view, it is kind of DoS attack because once this problem is triggered, all emails are rejected.

[psl (slansky)]

I found that one of DBs is corrupted:

# db_verify /var/lib/postgrey/postgrey_clients.db
Verification of /var/lib/postgrey/postgrey_clients.db succeeded.

# db_verify /var/lib/postgrey/postgrey.db
db_verify: Page 17: unaligned offset 3917 at page index 1
db_verify: Page 17: gap between items at offset 3916
db_verify: Page 17: item order check unsafe: skipping
db_verify: /var/lib/postgrey/postgrey.db: DB_VERIFY_BAD: Database verification failed
Verification of /var/lib/postgrey/postgrey.db failed.

I am not sure why DB is corrupted, maybe that postgrey crashed in the past...

[psl (slansky)]

I deleted DB in /var/lib/postgrey/ and started postgrey to create fresh DB. That was on Friday. It is Monday and I see DB is corrupted again.

# db_verify /var/lib/postgrey/*.db

db_verify: Page 466: incorrect next_pgno 583 found in leaf chain (should be 204)
db_verify: Page 204: incorrect prev_pgno 583 found in leaf chain (should be 466)
db_verify: Page 369: incorrect next_pgno 584 found in leaf chain (should be 239)
db_verify: /var/lib/postgrey/postgrey.db: DB_VERIFY_BAD: Database verification failed
Verification of /var/lib/postgrey/postgrey_clients.db succeeded.
Verification of /var/lib/postgrey/postgrey.db failed.

Once postgrey is restarted, DB is fixed. This happened second time today...

# service postgrey restart
# db_verify /var/lib/postgrey/*db

Verification of /var/lib/postgrey/postgrey_clients.db succeeded.
Verification of /var/lib/postgrey/postgrey.db succeeded.

Notice: /etc/init.d/postgrey script is broken and has to be modified. Script distributed with U12.04 will report that postgrey was restarted but it was not restarted!