Phil Chambers wrote:
This is an update on progress with diagnosing my problem with LMTP/IMAP hanging.
My diagnosis with reconstruct was a red herring! While I was patching
reconstruct to give diagnostics Exim tried a delivery and lmtpd locked the
user's cyrus.header file before hanging. When I killed the lmptd proces I found
no problem with reconstruct.
So, back to square one. I can't think of a way to debug this. It is imapd and
lmtpd which are hanging and I cannot possibly put diagnostic code into those
because the logs would explode on a live system.
I really need some suggestions!
Do you experience total failure after a delivery, or is this isolated to
a specific user agent? What happens if the connection is allowed to
timeout? Can the user make another IMAP connection successfully?
The reason I ask is because I was experiencing similar problems with
Thunderbird that I could not reproduce with any other MUA. In fact, I
could not intentionally reproduce the problem with Thunderbird, either.
While tailing the logs, I noticed that the hangups were always preceded
by an LMTP delivery to the user experiencing the hangup, which always
resulted in a "Connection to server mail.example.com timed out" error. I
did not have enough evidence to conclude that this was more than a
coincidence, however, as deliveries are relatively constant.
In order to overcome the problem, I played with various Thunderbird
settings until something worked. I've experienced no more hangups since
I unchecked "Use IDLE command if the server supports it". This is not
the only setting I changed, but it is the only one that had an effect.
Perhaps this information will prove helpful to you, anecdotal as it is.
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