[Dovecot] Re: Hang in 1.0.alpha4

[Zak Johnson]

Timo Sirainen wrote:
> Did imap/client.c get also patched? None of these show _client_output
> being called. And these were the last lines before it hanged? It shows
> that it should be calling _client_output next..
> 
> I updated http://dovecot.org/patches/hang-debug.diff , could you try
> again with it?

I have been having the same problems post-0.99: periodic hangs, usually
when selecting a large mailbox or fetching a large mail.  With 1.0a5 and
the above patch, here are the last few lines of logs:

imap(zakj): Warning: buffer_flush=1, flush_pending=0
imap(zakj): Warning: cork changed, set=1, io=0x0
imap(zakj): Warning: cork changed, set=0, io=0x0
imap(zakj): Warning: buffer_flush=1, flush_pending=0
imap(zakj): Warning: cork changed, set=1, io=0x0
imap(zakj): Warning: cork changed, set=0, io=0x0
imap(zakj): Warning: buffer_flush=1, flush_pending=0
imap(zakj): Warning: cork changed, set=1, io=0x0
imap(zakj): Warning: func -> command_pending=1
imap(zakj): Warning: _flush_pending -> 1
imap(zakj): Warning: cork changed, set=0, io=0x0
imap(zakj): Warning: buffer_flush=0, flush_pending=1
imap(zakj): Warning:  - adding2
imap(zakj): Warning: output handler started, callback=0x0
imap(zakj): Warning: output handler returned 1, flush_pending=0

The command immediately preceding the hang in this case was:

a4964 UID FETCH 2012 BODY.PEEK[]

-Zak