On 27 Oct 2006, at 05:08, Libor Pechacek wrote:
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< 250 2.1.0 ok
< 250 2.1.5 ok
< 354 go ahead
.
< 7 lockers
In this case the obvious reason for the error is the "7 lockers" line
that leaked from BDB. It makes only small harm itself but causes the
next message to be bounced due to protocol error in case the LMTP
connection is reused. Workaround to the bounces is simple -
"lmtp_cache_connection = no" in Postfix's main.cf.
Here's where this happens in BDB 4.3.29:
./lock/lock_deadlock.c-418- *nlockers = 0;
./lock/lock_deadlock.c-419- return (0);
./lock/lock_deadlock.c-420- }
./lock/lock_deadlock.c-421-
./lock/lock_deadlock.c-422- if (FLD_ISSET(dbenv->verbose,
DB_VERB_DEADLOCK))
./lock/lock_deadlock.c:423: __db_msg(dbenv, "%lu
lockers", (u_long)count);
./lock/lock_deadlock.c-424-
./lock/lock_deadlock.c-425- count += 20;
./lock/lock_deadlock.c-426- nentries = (u_int32_t)DB_ALIGN(count,
32) / 32;
./lock/lock_deadlock.c-427-
./lock/lock_deadlock.c-428- /*
So, first thing is that the message shouldn't be written if this
DB_VERB_DEADLOCK isn't set. Quickly skimming the BDB code, it
doesn't appear that this defaults on. I'm wondering if you have:
set_verbose db_verb_deadlock
in your DB_CONFIG file? Once it's on, I don't see a way to turn it
off, other than calling the set_verbose method from within Cyrus.
The larger problem is that daemons shouldn't be impacted by libraries
that inappropriately write to stdout or stderr. As such, lmtpd
should have closed stdin, stdout, stderr and reopening them with,
e.g., '/', O_RDONLY. Accepted connections should not use file
descriptors 0, 1, or 2, since those file descriptors are frequently
(mis)used by underlying libraries. This is the fatal error in inetd,
and apparently in cyrus master?
:wes
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