[Dovecot] assertion failure when appending

[Max]

On Tue, 2007-10-02 at 10:45 +0200, Johannes Berg wrote:
> I get this assertion failure:
> 
> file maildir-save.c: line 456 (maildir_save_finish): assertion failed:
> (ctx->seq != 0)
> 
> once a while when I APPEND messages to a folder. My plugin doesn't 
> touch the ctx, especially not the internal maildir one, but I have no 
> idea where to start looking. Any hints?

First, thank you Johannes for your terrific work. I just love the antispam plugin and it's really worth the effort to get it installed.

But now to the point, unfortunately I ran into the same issue you mentioned in your mail:
 
Oct  9 11:54:35 server dovecot: IMAP(imap-user at imap-server): file maildir-
	save.c: line 456 (maildir_save_finish): assertion failed: 
	(ctx->seq != 0)
Oct  9 11:54:35 server dovecot: IMAP(imap-user at imap-server): Raw backtrace:
	imap [0x80a8a4b] -> imap(i_info+0) [0x80a899a] -> 
	imap(maildir_save_cancel+0) [0x806ca6d] ->
	/usr/lib/dovecot/imap/lib90_antispam_plugin.so [0xb7ef04c6] -> 
	imap [0x8056097] -> imap [0x805688b] -> 
	imap(io_loop_handler_run+0x105) [0x80ae3bf] -> 
	imap(io_loop_run+0x1c) [0x80ad6e4] -> imap(main+0x4d0) [0x8062b0d] -> 
	/lib/libc.so.6(__libc_start_main+0xdc) [0xb7dda824] -> 
	imap [0x8055e51]
Oct  9 11:54:35 server dovecot: child 27849 (imap) killed with signal 6

This is how I reproduce the problem:
1) Start Outlook 2003
2) Connect to Dovecot 
3) Create a new IMAP folder named "Sent Items"
4) Open my old Outlook.pst data file
5) Copy one message from the old "Sent Items" folder to the new IMAP 
   folder (Outlook: "OK")
6) Copy another message from the old folder to the new folder 
   (Outlook: "Failure")
7) Assertion fails and imap child gets killed

The problem disappears when I disable the antispam plugin.

This is my environment:
- Gentoo (stable)
- Dovecot 1.0.3
- Antispam plugin from git repository as of October 5 14:33 GMT
- Backend is crm114-exec (20060704a-BlameRobert)
- Client is Outlook 2003 on Windows XP (SP2)

Currently my best guess is that the problem might be related to the fact that the mails Outlook stores in the "Sent Items" folder are lacking headers.

Thanks again for sharing your wonderful work.

Best regards,
Max