Hang when fetching mails via nnimap

[Moritz Heidkamp <moritz@twoticketsplease.de>]

Hi everyone,

I am experiencing hangs when fetching from my local IMAP server (through
an nnimap group). It seems to be pretty similar to what Tassilo Horn
describes in this thread:
http://comments.gmane.org/gmane.emacs.gnus.general/76433. After reading
that thread I tried upgrading to latest HEAD (i.e. 3544579) but the
symptoms didn't go away, in fact they are exactly the same as before
with the stock Emacs 23.3.1 gnus. What I get is a message like "nnimap
read 348k" when fetching mails and it always gets stuck at precisely
348k. Emacs then is unresponsive until I cancel it with C-g. According
to the *Messages* buffer, this message gets shown very often (553 times
in my last attempt) so it looks like it's stuck in some loop. The tail
of the nnimap log buffer looks like this:

  985 OK [READ-ONLY] Select completed.
  * 1 FETCH (UID 1 FLAGS (\Seen))
  * 2 FETCH (UID 2 FLAGS (\Seen))
  * 3 FETCH (UID 3 FLAGS (\Seen))
  * 4 FETCH (UID 4 FLAGS (\Seen))
  * 5 FETCH (UID 5 FLAGS (\Seen))
  * 6 FETCH (UID 6 FLAGS (\Seen))
  * 7 FETCH (UID 7 FLAGS (\Seen))
  * 8 FETCH (UID 8 FLAGS (\Seen))
  * 9 FETCH (UID 9 FLAGS (\Seen))
  * 10 FETCH (UID 10 FLAGS (\Seen))
  * 11 FETCH (UID 13 FLAGS (\Seen gnus-expire))
  * 12 FETCH (UID 14 FLAGS (\Seen gnus-expire))
  * 13 FETCH (UID 15 FLAGS (\Seen gnus-expire))
  * 14 FETCH (UID 16 FLAGS (\Seen gnus-expire))
  986 OK Fetch completed.
  * OK [CLOSED] Previous mailbox closed.
  * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
  * OK [PERMANENTFLAGS ()] Read-only mailbox.
  * 13 EXISTS
  * 0 RECENT
  * OK [UIDVALIDITY 1248213326] UIDs valid
  * OK [UIDNEXT 14] Predicted next UID
  * OK [HIGHESTMODSEQ 1] Highest
  987 OK [READ-ONLY] Select completed.
  * 13 FETCH (UID 13 FLAGS (\Seen))
  988 OK Fetch completed.

  Process *nnimap* deleted

Any ideas what I could do? Any information I could provide you with
additionally?

Thanks in advance
Moritz